Commit | Line | Data |
89c0a5a2 |
1 | package DBIx::Class::ResultSet; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use overload |
ebaefbc2 |
6 | '0+' => \&count, |
a910dc57 |
7 | 'bool' => sub { 1; }, |
89c0a5a2 |
8 | fallback => 1; |
3c5b25c5 |
9 | use Data::Page; |
ea20d0fd |
10 | use Storable; |
bcd26419 |
11 | use Scalar::Util qw/weaken/; |
89c0a5a2 |
12 | |
701da8c4 |
13 | use base qw/DBIx::Class/; |
14 | __PACKAGE__->load_components(qw/AccessorGroup/); |
a50bcd52 |
15 | __PACKAGE__->mk_group_accessors('simple' => qw/result_source result_class/); |
701da8c4 |
16 | |
ee38fa40 |
17 | =head1 NAME |
18 | |
bfab575a |
19 | DBIx::Class::ResultSet - Responsible for fetching and creating resultset. |
ee38fa40 |
20 | |
bfab575a |
21 | =head1 SYNOPSIS |
ee38fa40 |
22 | |
a33df5d4 |
23 | my $rs = $schema->resultset('User')->search(registered => 1); |
24d67825 |
24 | my @rows = $schema->resultset('CD')->search(year => 2005); |
ee38fa40 |
25 | |
26 | =head1 DESCRIPTION |
27 | |
bfab575a |
28 | The resultset is also known as an iterator. It is responsible for handling |
a33df5d4 |
29 | queries that may return an arbitrary number of rows, e.g. via L</search> |
bfab575a |
30 | or a C<has_many> relationship. |
ee38fa40 |
31 | |
a33df5d4 |
32 | In the examples below, the following table classes are used: |
33 | |
34 | package MyApp::Schema::Artist; |
35 | use base qw/DBIx::Class/; |
f4409169 |
36 | __PACKAGE__->load_components(qw/Core/); |
a33df5d4 |
37 | __PACKAGE__->table('artist'); |
38 | __PACKAGE__->add_columns(qw/artistid name/); |
39 | __PACKAGE__->set_primary_key('artistid'); |
40 | __PACKAGE__->has_many(cds => 'MyApp::Schema::CD'); |
41 | 1; |
42 | |
43 | package MyApp::Schema::CD; |
44 | use base qw/DBIx::Class/; |
f4409169 |
45 | __PACKAGE__->load_components(qw/Core/); |
46 | __PACKAGE__->table('cd'); |
a33df5d4 |
47 | __PACKAGE__->add_columns(qw/cdid artist title year/); |
48 | __PACKAGE__->set_primary_key('cdid'); |
49 | __PACKAGE__->belongs_to(artist => 'MyApp::Schema::Artist'); |
50 | 1; |
51 | |
ee38fa40 |
52 | =head1 METHODS |
53 | |
75d07914 |
54 | =head2 new |
87c4e602 |
55 | |
27f01d1f |
56 | =over 4 |
57 | |
a031138b |
58 | =item Arguments: $source, \%$attrs |
59 | |
60 | =item Return Value: $rs |
61 | |
27f01d1f |
62 | =back |
ee38fa40 |
63 | |
a33df5d4 |
64 | The resultset constructor. Takes a source object (usually a |
aa1088bf |
65 | L<DBIx::Class::ResultSourceProxy::Table>) and an attribute hash (see |
66 | L</ATTRIBUTES> below). Does not perform any queries -- these are |
67 | executed as needed by the other methods. |
a33df5d4 |
68 | |
69 | Generally you won't need to construct a resultset manually. You'll |
70 | automatically get one from e.g. a L</search> called in scalar context: |
71 | |
72 | my $rs = $schema->resultset('CD')->search({ title => '100th Window' }); |
ee38fa40 |
73 | |
a031138b |
74 | IMPORTANT: If called on an object, proxies to new_result instead so |
75 | |
76 | my $cd = $schema->resultset('CD')->new({ title => 'Spoon' }); |
77 | |
78 | will return a CD object, not a ResultSet. |
79 | |
ee38fa40 |
80 | =cut |
81 | |
89c0a5a2 |
82 | sub new { |
fea3d045 |
83 | my $class = shift; |
f9db5527 |
84 | return $class->new_result(@_) if ref $class; |
5e8b1b2a |
85 | |
fea3d045 |
86 | my ($source, $attrs) = @_; |
bcd26419 |
87 | weaken $source; |
ea20d0fd |
88 | $attrs = Storable::dclone($attrs || {}); # { %{ $attrs || {} } }; |
bcd26419 |
89 | #use Data::Dumper; warn Dumper($attrs); |
6aeb9185 |
90 | my $alias = ($attrs->{alias} ||= 'me'); |
5e8b1b2a |
91 | |
92 | $attrs->{columns} ||= delete $attrs->{cols} if $attrs->{cols}; |
1c258fc1 |
93 | delete $attrs->{as} if $attrs->{columns}; |
5e8b1b2a |
94 | $attrs->{columns} ||= [ $source->columns ] unless $attrs->{select}; |
aa1088bf |
95 | $attrs->{select} = [ |
96 | map { m/\./ ? $_ : "${alias}.$_" } @{delete $attrs->{columns}} |
97 | ] if $attrs->{columns}; |
98 | $attrs->{as} ||= [ |
99 | map { m/^\Q$alias.\E(.+)$/ ? $1 : $_ } @{$attrs->{select}} |
100 | ]; |
5ac6a044 |
101 | if (my $include = delete $attrs->{include_columns}) { |
102 | push(@{$attrs->{select}}, @$include); |
223aea40 |
103 | push(@{$attrs->{as}}, map { m/([^.]+)$/; $1; } @$include); |
5ac6a044 |
104 | } |
976f3686 |
105 | #use Data::Dumper; warn Dumper(@{$attrs}{qw/select as/}); |
5e8b1b2a |
106 | |
fea3d045 |
107 | $attrs->{from} ||= [ { $alias => $source->from } ]; |
8fab5eef |
108 | $attrs->{seen_join} ||= {}; |
5e8b1b2a |
109 | my %seen; |
b52e9bf8 |
110 | if (my $join = delete $attrs->{join}) { |
5e8b1b2a |
111 | foreach my $j (ref $join eq 'ARRAY' ? @$join : ($join)) { |
c7ce65e6 |
112 | if (ref $j eq 'HASH') { |
113 | $seen{$_} = 1 foreach keys %$j; |
114 | } else { |
115 | $seen{$j} = 1; |
116 | } |
117 | } |
aa1088bf |
118 | push(@{$attrs->{from}}, $source->resolve_join( |
119 | $join, $attrs->{alias}, $attrs->{seen_join}) |
120 | ); |
c7ce65e6 |
121 | } |
5e8b1b2a |
122 | |
54540863 |
123 | $attrs->{group_by} ||= $attrs->{select} if delete $attrs->{distinct}; |
aa1088bf |
124 | $attrs->{order_by} = [ $attrs->{order_by} ] if |
125 | $attrs->{order_by} and !ref($attrs->{order_by}); |
a86b1efe |
126 | $attrs->{order_by} ||= []; |
127 | |
555af3d9 |
128 | my $collapse = $attrs->{collapse} || {}; |
b3e8ac9b |
129 | if (my $prefetch = delete $attrs->{prefetch}) { |
0f66a01b |
130 | my @pre_order; |
5e8b1b2a |
131 | foreach my $p (ref $prefetch eq 'ARRAY' ? @$prefetch : ($prefetch)) { |
132 | if ( ref $p eq 'HASH' ) { |
b3e8ac9b |
133 | foreach my $key (keys %$p) { |
134 | push(@{$attrs->{from}}, $source->resolve_join($p, $attrs->{alias})) |
135 | unless $seen{$key}; |
136 | } |
5e8b1b2a |
137 | } else { |
b3e8ac9b |
138 | push(@{$attrs->{from}}, $source->resolve_join($p, $attrs->{alias})) |
139 | unless $seen{$p}; |
140 | } |
a86b1efe |
141 | my @prefetch = $source->resolve_prefetch( |
0f66a01b |
142 | $p, $attrs->{alias}, {}, \@pre_order, $collapse); |
489709af |
143 | push(@{$attrs->{select}}, map { $_->[0] } @prefetch); |
144 | push(@{$attrs->{as}}, map { $_->[1] } @prefetch); |
b3e8ac9b |
145 | } |
0f66a01b |
146 | push(@{$attrs->{order_by}}, @pre_order); |
fef5d100 |
147 | } |
555af3d9 |
148 | $attrs->{collapse} = $collapse; |
5e8b1b2a |
149 | # use Data::Dumper; warn Dumper($collapse) if keys %{$collapse}; |
555af3d9 |
150 | |
6aeb9185 |
151 | if ($attrs->{page}) { |
152 | $attrs->{rows} ||= 10; |
153 | $attrs->{offset} ||= 0; |
154 | $attrs->{offset} += ($attrs->{rows} * ($attrs->{page} - 1)); |
155 | } |
0f66a01b |
156 | |
5e8b1b2a |
157 | bless { |
701da8c4 |
158 | result_source => $source, |
a50bcd52 |
159 | result_class => $attrs->{result_class} || $source->result_class, |
89c0a5a2 |
160 | cond => $attrs->{where}, |
0a3c5b43 |
161 | from => $attrs->{from}, |
0f66a01b |
162 | collapse => $collapse, |
3c5b25c5 |
163 | count => undef, |
93b004d3 |
164 | page => delete $attrs->{page}, |
3c5b25c5 |
165 | pager => undef, |
5e8b1b2a |
166 | attrs => $attrs |
167 | }, $class; |
89c0a5a2 |
168 | } |
169 | |
bfab575a |
170 | =head2 search |
0a3c5b43 |
171 | |
b2f17732 |
172 | =over 4 |
173 | |
a031138b |
174 | =item Arguments: $cond, \%attrs? |
b2f17732 |
175 | |
a031138b |
176 | =item Return Value: $resultset (scalar context), @row_objs (list context) |
b2f17732 |
177 | |
178 | =back |
179 | |
180 | my @cds = $cd_rs->search({ year => 2001 }); # "... WHERE year = 2001" |
181 | my $new_rs = $cd_rs->search({ year => 2005 }); |
87f0da6a |
182 | |
a031138b |
183 | my $new_rs = $cd_rs->search([ { year => 2005 }, { year => 2004 } ]); |
184 | # year = 2005 OR year = 2004 |
185 | |
6009260a |
186 | If you need to pass in additional attributes but no additional condition, |
2053ab2a |
187 | call it as C<search(undef, \%attrs)>. |
87f0da6a |
188 | |
24d67825 |
189 | # "SELECT name, artistid FROM $artist_table" |
190 | my @all_artists = $schema->resultset('Artist')->search(undef, { |
191 | columns => [qw/name artistid/], |
192 | }); |
0a3c5b43 |
193 | |
194 | =cut |
195 | |
196 | sub search { |
197 | my $self = shift; |
ff7bb7a1 |
198 | |
8c91c8fe |
199 | my $attrs = { %{$self->{attrs}} }; |
200 | my $having = delete $attrs->{having}; |
201 | $attrs = { %$attrs, %{ pop(@_) } } if @_ > 1 and ref $_[$#_] eq 'HASH'; |
202 | |
203 | my $where = (@_ |
204 | ? ((@_ == 1 || ref $_[0] eq "HASH") |
205 | ? shift |
206 | : ((@_ % 2) |
207 | ? $self->throw_exception( |
208 | "Odd number of arguments to search") |
209 | : {@_})) |
210 | : undef()); |
211 | if (defined $where) { |
212 | $attrs->{where} = (defined $attrs->{where} |
213 | ? { '-and' => |
214 | [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ } |
215 | $where, $attrs->{where} ] } |
216 | : $where); |
217 | } |
8839560b |
218 | |
8c91c8fe |
219 | if (defined $having) { |
220 | $attrs->{having} = (defined $attrs->{having} |
221 | ? { '-and' => |
222 | [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ } |
223 | $having, $attrs->{having} ] } |
224 | : $having); |
ff7bb7a1 |
225 | } |
8c91c8fe |
226 | |
227 | my $rs = (ref $self)->new($self->result_source, $attrs); |
228 | |
765f5b7b |
229 | unless (@_) { # no search, effectively just a clone |
230 | my $rows = $self->get_cache; |
0823196c |
231 | if ($rows) { |
765f5b7b |
232 | $rs->set_cache($rows); |
233 | } |
ff7bb7a1 |
234 | } |
8c91c8fe |
235 | |
0a3c5b43 |
236 | return (wantarray ? $rs->all : $rs); |
237 | } |
238 | |
87f0da6a |
239 | =head2 search_literal |
240 | |
b2f17732 |
241 | =over 4 |
242 | |
a031138b |
243 | =item Arguments: $sql_fragment, @bind_values |
b2f17732 |
244 | |
a031138b |
245 | =item Return Value: $resultset (scalar context), @row_objs (list context) |
b2f17732 |
246 | |
247 | =back |
248 | |
249 | my @cds = $cd_rs->search_literal('year = ? AND title = ?', qw/2001 Reload/); |
250 | my $newrs = $artist_rs->search_literal('name = ?', 'Metallica'); |
6009260a |
251 | |
252 | Pass a literal chunk of SQL to be added to the conditional part of the |
b2f17732 |
253 | resultset query. |
6009260a |
254 | |
bfab575a |
255 | =cut |
fd9f5466 |
256 | |
6009260a |
257 | sub search_literal { |
258 | my ($self, $cond, @vals) = @_; |
259 | my $attrs = (ref $vals[$#vals] eq 'HASH' ? { %{ pop(@vals) } } : {}); |
260 | $attrs->{bind} = [ @{$self->{attrs}{bind}||[]}, @vals ]; |
261 | return $self->search(\$cond, $attrs); |
262 | } |
0a3c5b43 |
263 | |
87c4e602 |
264 | =head2 find |
265 | |
27f01d1f |
266 | =over 4 |
267 | |
ebc77b53 |
268 | =item Arguments: @values | \%cols, \%attrs? |
27f01d1f |
269 | |
a031138b |
270 | =item Return Value: $row_object |
b2f17732 |
271 | |
27f01d1f |
272 | =back |
87f0da6a |
273 | |
274 | Finds a row based on its primary key or unique constraint. For example: |
275 | |
87f0da6a |
276 | my $cd = $schema->resultset('CD')->find(5); |
277 | |
278 | Also takes an optional C<key> attribute, to search by a specific key or unique |
279 | constraint. For example: |
280 | |
fd9f5466 |
281 | my $cd = $schema->resultset('CD')->find( |
87f0da6a |
282 | { |
283 | artist => 'Massive Attack', |
284 | title => 'Mezzanine', |
285 | }, |
286 | { key => 'artist_title' } |
287 | ); |
288 | |
a33df5d4 |
289 | See also L</find_or_create> and L</update_or_create>. |
290 | |
87f0da6a |
291 | =cut |
716b3d29 |
292 | |
293 | sub find { |
294 | my ($self, @vals) = @_; |
295 | my $attrs = (@vals > 1 && ref $vals[$#vals] eq 'HASH' ? pop(@vals) : {}); |
87f0da6a |
296 | |
701da8c4 |
297 | my @cols = $self->result_source->primary_columns; |
87f0da6a |
298 | if (exists $attrs->{key}) { |
701da8c4 |
299 | my %uniq = $self->result_source->unique_constraints; |
aa1088bf |
300 | $self->throw_exception( |
301 | "Unknown key $attrs->{key} on '" . $self->result_source->name . "'" |
302 | ) unless exists $uniq{$attrs->{key}}; |
87f0da6a |
303 | @cols = @{ $uniq{$attrs->{key}} }; |
304 | } |
305 | #use Data::Dumper; warn Dumper($attrs, @vals, @cols); |
aa1088bf |
306 | $self->throw_exception( |
307 | "Can't find unless a primary key or unique constraint is defined" |
308 | ) unless @cols; |
87f0da6a |
309 | |
716b3d29 |
310 | my $query; |
311 | if (ref $vals[0] eq 'HASH') { |
01bc091e |
312 | $query = { %{$vals[0]} }; |
87f0da6a |
313 | } elsif (@cols == @vals) { |
716b3d29 |
314 | $query = {}; |
87f0da6a |
315 | @{$query}{@cols} = @vals; |
716b3d29 |
316 | } else { |
317 | $query = {@vals}; |
318 | } |
223aea40 |
319 | foreach my $key (grep { ! m/\./ } keys %$query) { |
320 | $query->{"$self->{attrs}{alias}.$key"} = delete $query->{$key}; |
01bc091e |
321 | } |
716b3d29 |
322 | #warn Dumper($query); |
8389d433 |
323 | |
324 | if (keys %$attrs) { |
325 | my $rs = $self->search($query,$attrs); |
326 | return keys %{$rs->{collapse}} ? $rs->next : $rs->single; |
327 | } else { |
aa1088bf |
328 | return keys %{$self->{collapse}} ? |
75d07914 |
329 | $self->search($query)->next : |
330 | $self->single($query); |
8389d433 |
331 | } |
716b3d29 |
332 | } |
333 | |
b52e9bf8 |
334 | =head2 search_related |
335 | |
b2f17732 |
336 | =over 4 |
337 | |
a031138b |
338 | =item Arguments: $cond, \%attrs? |
b2f17732 |
339 | |
a031138b |
340 | =item Return Value: $new_resultset |
b52e9bf8 |
341 | |
b2f17732 |
342 | =back |
343 | |
344 | $new_rs = $cd_rs->search_related('artist', { |
345 | name => 'Emo-R-Us', |
346 | }); |
347 | |
2053ab2a |
348 | Searches the specified relationship, optionally specifying a condition and |
b2f17732 |
349 | attributes for matching records. See L</ATTRIBUTES> for more information. |
a33df5d4 |
350 | |
b52e9bf8 |
351 | =cut |
352 | |
6aeb9185 |
353 | sub search_related { |
64acc2bc |
354 | return shift->related_resultset(shift)->search(@_); |
6aeb9185 |
355 | } |
b52e9bf8 |
356 | |
bfab575a |
357 | =head2 cursor |
ee38fa40 |
358 | |
b2f17732 |
359 | =over 4 |
360 | |
a031138b |
361 | =item Arguments: none |
b2f17732 |
362 | |
a031138b |
363 | =item Return Value: $cursor |
b2f17732 |
364 | |
365 | =back |
366 | |
367 | Returns a storage-driven cursor to the given resultset. See |
368 | L<DBIx::Class::Cursor> for more information. |
ee38fa40 |
369 | |
370 | =cut |
371 | |
73f58123 |
372 | sub cursor { |
373 | my ($self) = @_; |
223aea40 |
374 | my $attrs = { %{$self->{attrs}} }; |
73f58123 |
375 | return $self->{cursor} |
701da8c4 |
376 | ||= $self->result_source->storage->select($self->{from}, $attrs->{select}, |
73f58123 |
377 | $attrs->{where},$attrs); |
378 | } |
379 | |
a04ab285 |
380 | =head2 single |
381 | |
b2f17732 |
382 | =over 4 |
383 | |
a031138b |
384 | =item Arguments: $cond? |
b2f17732 |
385 | |
a031138b |
386 | =item Return Value: $row_object? |
b2f17732 |
387 | |
388 | =back |
389 | |
390 | my $cd = $schema->resultset('CD')->single({ year => 2001 }); |
391 | |
a031138b |
392 | Inflates the first result without creating a cursor if the resultset has |
393 | any records in it; if not returns nothing. Used by find() as an optimisation. |
a04ab285 |
394 | |
395 | =cut |
396 | |
397 | sub single { |
223aea40 |
398 | my ($self, $where) = @_; |
399 | my $attrs = { %{$self->{attrs}} }; |
400 | if ($where) { |
a04ab285 |
401 | if (defined $attrs->{where}) { |
402 | $attrs->{where} = { |
75d07914 |
403 | '-and' => |
223aea40 |
404 | [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ } |
405 | $where, delete $attrs->{where} ] |
a04ab285 |
406 | }; |
407 | } else { |
223aea40 |
408 | $attrs->{where} = $where; |
a04ab285 |
409 | } |
410 | } |
411 | my @data = $self->result_source->storage->select_single( |
412 | $self->{from}, $attrs->{select}, |
413 | $attrs->{where},$attrs); |
414 | return (@data ? $self->_construct_object(@data) : ()); |
415 | } |
416 | |
417 | |
87f0da6a |
418 | =head2 search_like |
419 | |
b2f17732 |
420 | =over 4 |
421 | |
a031138b |
422 | =item Arguments: $cond, \%attrs? |
b2f17732 |
423 | |
a031138b |
424 | =item Return Value: $resultset (scalar context), @row_objs (list context) |
b2f17732 |
425 | |
426 | =back |
427 | |
428 | # WHERE title LIKE '%blue%' |
429 | $cd_rs = $rs->search_like({ title => '%blue%'}); |
430 | |
2053ab2a |
431 | Performs a search, but uses C<LIKE> instead of C<=> as the condition. Note |
b2f17732 |
432 | that this is simply a convenience method. You most likely want to use |
a33df5d4 |
433 | L</search> with specific operators. |
434 | |
435 | For more information, see L<DBIx::Class::Manual::Cookbook>. |
87f0da6a |
436 | |
437 | =cut |
58a4bd18 |
438 | |
439 | sub search_like { |
223aea40 |
440 | my $class = shift; |
441 | my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {}); |
442 | my $query = ref $_[0] eq 'HASH' ? { %{shift()} }: {@_}; |
58a4bd18 |
443 | $query->{$_} = { 'like' => $query->{$_} } for keys %$query; |
444 | return $class->search($query, { %$attrs }); |
445 | } |
446 | |
87c4e602 |
447 | =head2 slice |
448 | |
27f01d1f |
449 | =over 4 |
450 | |
a031138b |
451 | =item Arguments: $first, $last |
27f01d1f |
452 | |
a031138b |
453 | =item Return Value: $resultset (scalar context), @row_objs (list context) |
b2f17732 |
454 | |
27f01d1f |
455 | =back |
ee38fa40 |
456 | |
a031138b |
457 | Returns a resultset or object list representing a subset of elements from the |
2053ab2a |
458 | resultset slice is called on. Indexes are from 0, i.e., to get the first |
459 | three records, call: |
a031138b |
460 | |
461 | my ($one, $two, $three) = $rs->slice(0, 2); |
ee38fa40 |
462 | |
463 | =cut |
464 | |
89c0a5a2 |
465 | sub slice { |
466 | my ($self, $min, $max) = @_; |
237f3e3b |
467 | my $attrs = {}; # = { %{ $self->{attrs} || {} } }; |
468 | $attrs->{offset} = $self->{attrs}{offset} || 0; |
6aeb9185 |
469 | $attrs->{offset} += $min; |
89c0a5a2 |
470 | $attrs->{rows} = ($max ? ($max - $min + 1) : 1); |
237f3e3b |
471 | return $self->search(undef(), $attrs); |
472 | #my $slice = (ref $self)->new($self->result_source, $attrs); |
473 | #return (wantarray ? $slice->all : $slice); |
89c0a5a2 |
474 | } |
475 | |
87f0da6a |
476 | =head2 next |
ee38fa40 |
477 | |
a031138b |
478 | =over 4 |
479 | |
480 | =item Arguments: none |
481 | |
482 | =item Return Value: $result? |
483 | |
484 | =back |
485 | |
a33df5d4 |
486 | Returns the next element in the resultset (C<undef> is there is none). |
487 | |
488 | Can be used to efficiently iterate over records in the resultset: |
489 | |
5e8b1b2a |
490 | my $rs = $schema->resultset('CD')->search; |
a33df5d4 |
491 | while (my $cd = $rs->next) { |
492 | print $cd->title; |
493 | } |
ee38fa40 |
494 | |
ea1eaf8d |
495 | Note that you need to store the resultset object, and call C<next> on it. |
496 | Calling C<< resultset('Table')->next >> repeatedly will always return the |
497 | first record from the resultset. |
498 | |
ee38fa40 |
499 | =cut |
500 | |
89c0a5a2 |
501 | sub next { |
502 | my ($self) = @_; |
0823196c |
503 | if (my $cache = $self->get_cache) { |
64acc2bc |
504 | $self->{all_cache_position} ||= 0; |
0823196c |
505 | return $cache->[$self->{all_cache_position}++]; |
64acc2bc |
506 | } |
3e0e9e27 |
507 | if ($self->{attrs}{cache}) { |
0f66a01b |
508 | $self->{all_cache_position} = 1; |
3e0e9e27 |
509 | return ($self->all)[0]; |
510 | } |
aa1088bf |
511 | my @row = (exists $self->{stashed_row} ? |
75d07914 |
512 | @{delete $self->{stashed_row}} : |
513 | $self->cursor->next |
aa1088bf |
514 | ); |
a953d8d9 |
515 | # warn Dumper(\@row); use Data::Dumper; |
89c0a5a2 |
516 | return unless (@row); |
c7ce65e6 |
517 | return $self->_construct_object(@row); |
518 | } |
519 | |
520 | sub _construct_object { |
521 | my ($self, @row) = @_; |
b3e8ac9b |
522 | my @as = @{ $self->{attrs}{as} }; |
223aea40 |
523 | |
0f66a01b |
524 | my $info = $self->_collapse_result(\@as, \@row); |
223aea40 |
525 | |
a50bcd52 |
526 | my $new = $self->result_class->inflate_result($self->result_source, @$info); |
223aea40 |
527 | |
33ce49d6 |
528 | $new = $self->{attrs}{record_filter}->($new) |
529 | if exists $self->{attrs}{record_filter}; |
530 | return $new; |
89c0a5a2 |
531 | } |
532 | |
0f66a01b |
533 | sub _collapse_result { |
534 | my ($self, $as, $row, $prefix) = @_; |
535 | |
536 | my %const; |
537 | |
538 | my @copy = @$row; |
5a5bec6c |
539 | foreach my $this_as (@$as) { |
540 | my $val = shift @copy; |
541 | if (defined $prefix) { |
542 | if ($this_as =~ m/^\Q${prefix}.\E(.+)$/) { |
543 | my $remain = $1; |
223aea40 |
544 | $remain =~ /^(?:(.*)\.)?([^.]+)$/; |
5a5bec6c |
545 | $const{$1||''}{$2} = $val; |
546 | } |
547 | } else { |
223aea40 |
548 | $this_as =~ /^(?:(.*)\.)?([^.]+)$/; |
5a5bec6c |
549 | $const{$1||''}{$2} = $val; |
0f66a01b |
550 | } |
0f66a01b |
551 | } |
552 | |
0f66a01b |
553 | my $info = [ {}, {} ]; |
554 | foreach my $key (keys %const) { |
555 | if (length $key) { |
556 | my $target = $info; |
557 | my @parts = split(/\./, $key); |
558 | foreach my $p (@parts) { |
559 | $target = $target->[1]->{$p} ||= []; |
560 | } |
561 | $target->[0] = $const{$key}; |
562 | } else { |
563 | $info->[0] = $const{$key}; |
564 | } |
565 | } |
566 | |
aa1088bf |
567 | my @collapse; |
568 | if (defined $prefix) { |
569 | @collapse = map { |
75d07914 |
570 | m/^\Q${prefix}.\E(.+)$/ ? ($1) : () |
d2c26f3f |
571 | } keys %{$self->{collapse}} |
aa1088bf |
572 | } else { |
573 | @collapse = keys %{$self->{collapse}}; |
d2c26f3f |
574 | }; |
aa1088bf |
575 | |
5a5bec6c |
576 | if (@collapse) { |
577 | my ($c) = sort { length $a <=> length $b } @collapse; |
0f66a01b |
578 | my $target = $info; |
0f66a01b |
579 | foreach my $p (split(/\./, $c)) { |
5a5bec6c |
580 | $target = $target->[1]->{$p} ||= []; |
0f66a01b |
581 | } |
5a5bec6c |
582 | my $c_prefix = (defined($prefix) ? "${prefix}.${c}" : $c); |
583 | my @co_key = @{$self->{collapse}{$c_prefix}}; |
0f66a01b |
584 | my %co_check = map { ($_, $target->[0]->{$_}); } @co_key; |
5a5bec6c |
585 | my $tree = $self->_collapse_result($as, $row, $c_prefix); |
0f66a01b |
586 | my (@final, @raw); |
5a5bec6c |
587 | while ( !(grep { |
aa1088bf |
588 | !defined($tree->[0]->{$_}) || |
75d07914 |
589 | $co_check{$_} ne $tree->[0]->{$_} |
5a5bec6c |
590 | } @co_key) ) { |
0f66a01b |
591 | push(@final, $tree); |
592 | last unless (@raw = $self->cursor->next); |
593 | $row = $self->{stashed_row} = \@raw; |
5a5bec6c |
594 | $tree = $self->_collapse_result($as, $row, $c_prefix); |
0f66a01b |
595 | } |
0823196c |
596 | @$target = (@final ? @final : [ {}, {} ]); |
597 | # single empty result to indicate an empty prefetched has_many |
0f66a01b |
598 | } |
599 | |
0f66a01b |
600 | return $info; |
601 | } |
602 | |
87c4e602 |
603 | =head2 result_source |
701da8c4 |
604 | |
a031138b |
605 | =over 4 |
606 | |
607 | =item Arguments: $result_source? |
608 | |
609 | =item Return Value: $result_source |
610 | |
611 | =back |
612 | |
613 | An accessor for the primary ResultSource object from which this ResultSet |
614 | is derived. |
701da8c4 |
615 | |
616 | =cut |
617 | |
618 | |
bfab575a |
619 | =head2 count |
ee38fa40 |
620 | |
a031138b |
621 | =over 4 |
622 | |
ebc77b53 |
623 | =item Arguments: $cond, \%attrs?? |
a031138b |
624 | |
625 | =item Return Value: $count |
626 | |
627 | =back |
628 | |
bfab575a |
629 | Performs an SQL C<COUNT> with the same query as the resultset was built |
6009260a |
630 | with to find the number of elements. If passed arguments, does a search |
631 | on the resultset and counts the results of that. |
ee38fa40 |
632 | |
bda4c2b8 |
633 | Note: When using C<count> with C<group_by>, L<DBIX::Class> emulates C<GROUP BY> |
634 | using C<COUNT( DISTINCT( columns ) )>. Some databases (notably SQLite) do |
635 | not support C<DISTINCT> with multiple columns. If you are using such a |
636 | database, you should only use columns from the main table in your C<group_by> |
637 | clause. |
638 | |
ee38fa40 |
639 | =cut |
640 | |
89c0a5a2 |
641 | sub count { |
6009260a |
642 | my $self = shift; |
223aea40 |
643 | return $self->search(@_)->count if @_ and defined $_[0]; |
0823196c |
644 | return scalar @{ $self->get_cache } if $self->get_cache; |
15c382be |
645 | |
84e3c114 |
646 | my $count = $self->_count; |
647 | return 0 unless $count; |
15c382be |
648 | |
6aeb9185 |
649 | $count -= $self->{attrs}{offset} if $self->{attrs}{offset}; |
650 | $count = $self->{attrs}{rows} if |
223aea40 |
651 | $self->{attrs}{rows} and $self->{attrs}{rows} < $count; |
6aeb9185 |
652 | return $count; |
89c0a5a2 |
653 | } |
654 | |
84e3c114 |
655 | sub _count { # Separated out so pager can get the full count |
656 | my $self = shift; |
657 | my $select = { count => '*' }; |
658 | my $attrs = { %{ $self->{attrs} } }; |
659 | if (my $group_by = delete $attrs->{group_by}) { |
660 | delete $attrs->{having}; |
661 | my @distinct = (ref $group_by ? @$group_by : ($group_by)); |
662 | # todo: try CONCAT for multi-column pk |
663 | my @pk = $self->result_source->primary_columns; |
664 | if (@pk == 1) { |
665 | foreach my $column (@distinct) { |
666 | if ($column =~ qr/^(?:\Q$attrs->{alias}.\E)?$pk[0]$/) { |
667 | @distinct = ($column); |
668 | last; |
669 | } |
75d07914 |
670 | } |
84e3c114 |
671 | } |
672 | |
673 | $select = { count => { distinct => \@distinct } }; |
674 | #use Data::Dumper; die Dumper $select; |
675 | } |
676 | |
677 | $attrs->{select} = $select; |
678 | $attrs->{as} = [qw/count/]; |
679 | |
680 | # offset, order by and page are not needed to count. record_filter is cdbi |
681 | delete $attrs->{$_} for qw/rows offset order_by page pager record_filter/; |
682 | |
683 | my ($count) = (ref $self)->new($self->result_source, $attrs)->cursor->next; |
684 | return $count; |
685 | } |
686 | |
bfab575a |
687 | =head2 count_literal |
6009260a |
688 | |
a031138b |
689 | =over 4 |
690 | |
691 | =item Arguments: $sql_fragment, @bind_values |
692 | |
693 | =item Return Value: $count |
694 | |
695 | =back |
696 | |
b2f17732 |
697 | Counts the results in a literal query. Equivalent to calling L</search_literal> |
698 | with the passed arguments, then L</count>. |
6009260a |
699 | |
700 | =cut |
701 | |
702 | sub count_literal { shift->search_literal(@_)->count; } |
703 | |
bfab575a |
704 | =head2 all |
ee38fa40 |
705 | |
a031138b |
706 | =over 4 |
707 | |
708 | =item Arguments: none |
709 | |
710 | =item Return Value: @objects |
711 | |
712 | =back |
713 | |
880a1a0c |
714 | Returns all elements in the resultset. Called implicitly if the resultset |
bfab575a |
715 | is returned in list context. |
ee38fa40 |
716 | |
717 | =cut |
718 | |
89c0a5a2 |
719 | sub all { |
720 | my ($self) = @_; |
0823196c |
721 | return @{ $self->get_cache } if $self->get_cache; |
5a5bec6c |
722 | |
723 | my @obj; |
724 | |
725 | if (keys %{$self->{collapse}}) { |
726 | # Using $self->cursor->all is really just an optimisation. |
727 | # If we're collapsing has_many prefetches it probably makes |
728 | # very little difference, and this is cleaner than hacking |
729 | # _construct_object to survive the approach |
5a5bec6c |
730 | $self->cursor->reset; |
479ed423 |
731 | my @row = $self->cursor->next; |
732 | while (@row) { |
5a5bec6c |
733 | push(@obj, $self->_construct_object(@row)); |
479ed423 |
734 | @row = (exists $self->{stashed_row} |
735 | ? @{delete $self->{stashed_row}} |
736 | : $self->cursor->next); |
5a5bec6c |
737 | } |
738 | } else { |
223aea40 |
739 | @obj = map { $self->_construct_object(@$_) } $self->cursor->all; |
64acc2bc |
740 | } |
5a5bec6c |
741 | |
223aea40 |
742 | $self->set_cache(\@obj) if $self->{attrs}{cache}; |
5a5bec6c |
743 | return @obj; |
89c0a5a2 |
744 | } |
745 | |
bfab575a |
746 | =head2 reset |
ee38fa40 |
747 | |
a031138b |
748 | =over 4 |
749 | |
750 | =item Arguments: none |
751 | |
752 | =item Return Value: $self |
753 | |
754 | =back |
755 | |
bfab575a |
756 | Resets the resultset's cursor, so you can iterate through the elements again. |
ee38fa40 |
757 | |
758 | =cut |
759 | |
89c0a5a2 |
760 | sub reset { |
761 | my ($self) = @_; |
64acc2bc |
762 | $self->{all_cache_position} = 0; |
73f58123 |
763 | $self->cursor->reset; |
89c0a5a2 |
764 | return $self; |
765 | } |
766 | |
bfab575a |
767 | =head2 first |
ee38fa40 |
768 | |
a031138b |
769 | =over 4 |
770 | |
771 | =item Arguments: none |
772 | |
773 | =item Return Value: $object? |
774 | |
775 | =back |
776 | |
777 | Resets the resultset and returns an object for the first result (if the |
2053ab2a |
778 | resultset returns anything). |
ee38fa40 |
779 | |
780 | =cut |
781 | |
89c0a5a2 |
782 | sub first { |
783 | return $_[0]->reset->next; |
784 | } |
785 | |
0f57d214 |
786 | # _cond_for_update_delete |
787 | # |
788 | # update/delete require the condition to be modified to handle |
789 | # the differing SQL syntax available. This transforms the $self->{cond} |
16b4fd26 |
790 | # appropriately, returning the new condition. |
0f57d214 |
791 | |
792 | sub _cond_for_update_delete { |
793 | my ($self) = @_; |
794 | my $cond = {}; |
795 | |
796 | if (!ref($self->{cond})) { |
16b4fd26 |
797 | # No-op. No condition, we're updating/deleting everything |
0f57d214 |
798 | } |
799 | elsif (ref $self->{cond} eq 'ARRAY') { |
800 | $cond = [ |
801 | map { |
802 | my %hash; |
803 | foreach my $key (keys %{$_}) { |
804 | $key =~ /([^.]+)$/; |
805 | $hash{$1} = $_->{$key}; |
806 | } |
807 | \%hash; |
16b4fd26 |
808 | } @{$self->{cond}} |
0f57d214 |
809 | ]; |
810 | } |
811 | elsif (ref $self->{cond} eq 'HASH') { |
812 | if ((keys %{$self->{cond}})[0] eq '-and') { |
16b4fd26 |
813 | $cond->{-and} = []; |
814 | |
815 | my @cond = @{$self->{cond}{-and}}; |
816 | for (my $i = 0; $i < @cond - 1; $i++) { |
817 | my $entry = $cond[$i]; |
818 | |
819 | my %hash; |
820 | if (ref $entry eq 'HASH') { |
821 | foreach my $key (keys %{$entry}) { |
0f57d214 |
822 | $key =~ /([^.]+)$/; |
16b4fd26 |
823 | $hash{$1} = $entry->{$key}; |
0f57d214 |
824 | } |
16b4fd26 |
825 | } |
826 | else { |
827 | $entry =~ /([^.]+)$/; |
828 | $hash{$entry} = $cond[++$i]; |
829 | } |
830 | |
831 | push @{$cond->{-and}}, \%hash; |
832 | } |
0f57d214 |
833 | } |
834 | else { |
835 | foreach my $key (keys %{$self->{cond}}) { |
836 | $key =~ /([^.]+)$/; |
837 | $cond->{$1} = $self->{cond}{$key}; |
838 | } |
839 | } |
840 | } |
841 | else { |
842 | $self->throw_exception( |
16b4fd26 |
843 | "Can't update/delete on resultset with condition unless hash or array" |
844 | ); |
0f57d214 |
845 | } |
16b4fd26 |
846 | |
0f57d214 |
847 | return $cond; |
848 | } |
849 | |
850 | |
87c4e602 |
851 | =head2 update |
852 | |
27f01d1f |
853 | =over 4 |
854 | |
a031138b |
855 | =item Arguments: \%values |
856 | |
857 | =item Return Value: $storage_rv |
27f01d1f |
858 | |
859 | =back |
c01ab172 |
860 | |
a031138b |
861 | Sets the specified columns in the resultset to the supplied values in a |
862 | single query. Return value will be true if the update succeeded or false |
863 | if no records were updated; exact type of success value is storage-dependent. |
c01ab172 |
864 | |
865 | =cut |
866 | |
867 | sub update { |
868 | my ($self, $values) = @_; |
aa1088bf |
869 | $self->throw_exception("Values for update must be a hash") |
870 | unless ref $values eq 'HASH'; |
0f57d214 |
871 | |
872 | my $cond = $self->_cond_for_update_delete; |
873 | |
701da8c4 |
874 | return $self->result_source->storage->update( |
0f57d214 |
875 | $self->result_source->from, $values, $cond |
27f01d1f |
876 | ); |
c01ab172 |
877 | } |
878 | |
87c4e602 |
879 | =head2 update_all |
880 | |
27f01d1f |
881 | =over 4 |
882 | |
a031138b |
883 | =item Arguments: \%values |
884 | |
885 | =item Return Value: 1 |
27f01d1f |
886 | |
887 | =back |
c01ab172 |
888 | |
2053ab2a |
889 | Fetches all objects and updates them one at a time. Note that C<update_all> |
890 | will run DBIC cascade triggers, while L</update> will not. |
c01ab172 |
891 | |
892 | =cut |
893 | |
894 | sub update_all { |
895 | my ($self, $values) = @_; |
aa1088bf |
896 | $self->throw_exception("Values for update must be a hash") |
897 | unless ref $values eq 'HASH'; |
c01ab172 |
898 | foreach my $obj ($self->all) { |
899 | $obj->set_columns($values)->update; |
900 | } |
901 | return 1; |
902 | } |
903 | |
bfab575a |
904 | =head2 delete |
ee38fa40 |
905 | |
a031138b |
906 | =over 4 |
907 | |
908 | =item Arguments: none |
909 | |
910 | =item Return Value: 1 |
911 | |
912 | =back |
913 | |
b2f17732 |
914 | Deletes the contents of the resultset from its result source. Note that this |
2053ab2a |
915 | will not run DBIC cascade triggers. See L</delete_all> if you need triggers |
916 | to run. |
ee38fa40 |
917 | |
918 | =cut |
919 | |
28927b50 |
920 | sub delete { |
89c0a5a2 |
921 | my ($self) = @_; |
ca4b5ab7 |
922 | my $del = {}; |
7ed3d6dc |
923 | |
0f57d214 |
924 | my $cond = $self->_cond_for_update_delete; |
7ed3d6dc |
925 | |
0f57d214 |
926 | $self->result_source->storage->delete($self->result_source->from, $cond); |
89c0a5a2 |
927 | return 1; |
928 | } |
929 | |
c01ab172 |
930 | =head2 delete_all |
931 | |
a031138b |
932 | =over 4 |
933 | |
934 | =item Arguments: none |
935 | |
936 | =item Return Value: 1 |
937 | |
938 | =back |
939 | |
2053ab2a |
940 | Fetches all objects and deletes them one at a time. Note that C<delete_all> |
941 | will run DBIC cascade triggers, while L</delete> will not. |
c01ab172 |
942 | |
943 | =cut |
944 | |
945 | sub delete_all { |
946 | my ($self) = @_; |
947 | $_->delete for $self->all; |
948 | return 1; |
949 | } |
28927b50 |
950 | |
bfab575a |
951 | =head2 pager |
ee38fa40 |
952 | |
a031138b |
953 | =over 4 |
954 | |
955 | =item Arguments: none |
956 | |
957 | =item Return Value: $pager |
958 | |
959 | =back |
960 | |
961 | Return Value a L<Data::Page> object for the current resultset. Only makes |
a33df5d4 |
962 | sense for queries with a C<page> attribute. |
ee38fa40 |
963 | |
964 | =cut |
965 | |
3c5b25c5 |
966 | sub pager { |
967 | my ($self) = @_; |
968 | my $attrs = $self->{attrs}; |
aa1088bf |
969 | $self->throw_exception("Can't create pager for non-paged rs") |
970 | unless $self->{page}; |
6aeb9185 |
971 | $attrs->{rows} ||= 10; |
6aeb9185 |
972 | return $self->{pager} ||= Data::Page->new( |
84e3c114 |
973 | $self->_count, $attrs->{rows}, $self->{page}); |
3c5b25c5 |
974 | } |
975 | |
87c4e602 |
976 | =head2 page |
977 | |
27f01d1f |
978 | =over 4 |
979 | |
a031138b |
980 | =item Arguments: $page_number |
981 | |
982 | =item Return Value: $rs |
27f01d1f |
983 | |
984 | =back |
ee38fa40 |
985 | |
a031138b |
986 | Returns a resultset for the $page_number page of the resultset on which page |
987 | is called, where each page contains a number of rows equal to the 'rows' |
2053ab2a |
988 | attribute set on the resultset (10 by default). |
ee38fa40 |
989 | |
990 | =cut |
991 | |
3c5b25c5 |
992 | sub page { |
993 | my ($self, $page) = @_; |
6aeb9185 |
994 | my $attrs = { %{$self->{attrs}} }; |
3c5b25c5 |
995 | $attrs->{page} = $page; |
701da8c4 |
996 | return (ref $self)->new($self->result_source, $attrs); |
fea3d045 |
997 | } |
998 | |
87c4e602 |
999 | =head2 new_result |
1000 | |
27f01d1f |
1001 | =over 4 |
1002 | |
a031138b |
1003 | =item Arguments: \%vals |
1004 | |
1005 | =item Return Value: $object |
27f01d1f |
1006 | |
1007 | =back |
fea3d045 |
1008 | |
a031138b |
1009 | Creates an object in the resultset's result class and returns it. |
fea3d045 |
1010 | |
1011 | =cut |
1012 | |
1013 | sub new_result { |
1014 | my ($self, $values) = @_; |
701da8c4 |
1015 | $self->throw_exception( "new_result needs a hash" ) |
fea3d045 |
1016 | unless (ref $values eq 'HASH'); |
aa1088bf |
1017 | $self->throw_exception( |
1018 | "Can't abstract implicit construct, condition not a hash" |
1019 | ) if ($self->{cond} && !(ref $self->{cond} eq 'HASH')); |
fea3d045 |
1020 | my %new = %$values; |
1021 | my $alias = $self->{attrs}{alias}; |
1022 | foreach my $key (keys %{$self->{cond}||{}}) { |
223aea40 |
1023 | $new{$1} = $self->{cond}{$key} if ($key =~ m/^(?:\Q${alias}.\E)?([^.]+)$/); |
fea3d045 |
1024 | } |
a50bcd52 |
1025 | my $obj = $self->result_class->new(\%new); |
701da8c4 |
1026 | $obj->result_source($self->result_source) if $obj->can('result_source'); |
223aea40 |
1027 | return $obj; |
fea3d045 |
1028 | } |
1029 | |
87c4e602 |
1030 | =head2 create |
1031 | |
27f01d1f |
1032 | =over 4 |
1033 | |
a031138b |
1034 | =item Arguments: \%vals |
1035 | |
1036 | =item Return Value: $object |
27f01d1f |
1037 | |
1038 | =back |
fea3d045 |
1039 | |
a031138b |
1040 | Inserts a record into the resultset and returns the object representing it. |
fea3d045 |
1041 | |
a33df5d4 |
1042 | Effectively a shortcut for C<< ->new_result(\%vals)->insert >>. |
fea3d045 |
1043 | |
1044 | =cut |
1045 | |
1046 | sub create { |
1047 | my ($self, $attrs) = @_; |
aa1088bf |
1048 | $self->throw_exception( "create needs a hashref" ) |
1049 | unless ref $attrs eq 'HASH'; |
fea3d045 |
1050 | return $self->new_result($attrs)->insert; |
3c5b25c5 |
1051 | } |
1052 | |
87c4e602 |
1053 | =head2 find_or_create |
1054 | |
27f01d1f |
1055 | =over 4 |
1056 | |
a031138b |
1057 | =item Arguments: \%vals, \%attrs? |
1058 | |
1059 | =item Return Value: $object |
27f01d1f |
1060 | |
1061 | =back |
87f0da6a |
1062 | |
1063 | $class->find_or_create({ key => $val, ... }); |
c2b15ecc |
1064 | |
fd9f5466 |
1065 | Searches for a record matching the search condition; if it doesn't find one, |
1066 | creates one and returns that instead. |
87f0da6a |
1067 | |
87f0da6a |
1068 | my $cd = $schema->resultset('CD')->find_or_create({ |
1069 | cdid => 5, |
1070 | artist => 'Massive Attack', |
1071 | title => 'Mezzanine', |
1072 | year => 2005, |
1073 | }); |
1074 | |
1075 | Also takes an optional C<key> attribute, to search by a specific key or unique |
1076 | constraint. For example: |
1077 | |
1078 | my $cd = $schema->resultset('CD')->find_or_create( |
1079 | { |
1080 | artist => 'Massive Attack', |
1081 | title => 'Mezzanine', |
1082 | }, |
1083 | { key => 'artist_title' } |
1084 | ); |
1085 | |
1086 | See also L</find> and L</update_or_create>. |
1087 | |
c2b15ecc |
1088 | =cut |
1089 | |
1090 | sub find_or_create { |
1091 | my $self = shift; |
87f0da6a |
1092 | my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {}); |
223aea40 |
1093 | my $hash = ref $_[0] eq 'HASH' ? shift : {@_}; |
87f0da6a |
1094 | my $exists = $self->find($hash, $attrs); |
223aea40 |
1095 | return defined $exists ? $exists : $self->create($hash); |
c2b15ecc |
1096 | } |
1097 | |
87f0da6a |
1098 | =head2 update_or_create |
1099 | |
a031138b |
1100 | =over 4 |
1101 | |
1102 | =item Arguments: \%col_values, { key => $unique_constraint }? |
1103 | |
1104 | =item Return Value: $object |
1105 | |
1106 | =back |
1107 | |
1108 | $class->update_or_create({ col => $val, ... }); |
87f0da6a |
1109 | |
2053ab2a |
1110 | First, searches for an existing row matching one of the unique constraints |
1111 | (including the primary key) on the source of this resultset. If a row is |
1112 | found, updates it with the other given column values. Otherwise, creates a new |
87f0da6a |
1113 | row. |
1114 | |
1115 | Takes an optional C<key> attribute to search on a specific unique constraint. |
1116 | For example: |
1117 | |
1118 | # In your application |
1119 | my $cd = $schema->resultset('CD')->update_or_create( |
1120 | { |
1121 | artist => 'Massive Attack', |
1122 | title => 'Mezzanine', |
1123 | year => 1998, |
1124 | }, |
1125 | { key => 'artist_title' } |
1126 | ); |
1127 | |
1128 | If no C<key> is specified, it searches on all unique constraints defined on the |
1129 | source, including the primary key. |
1130 | |
2053ab2a |
1131 | If the C<key> is specified as C<primary>, it searches only on the primary key. |
87f0da6a |
1132 | |
a33df5d4 |
1133 | See also L</find> and L</find_or_create>. |
1134 | |
87f0da6a |
1135 | =cut |
1136 | |
1137 | sub update_or_create { |
1138 | my $self = shift; |
87f0da6a |
1139 | my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {}); |
223aea40 |
1140 | my $hash = ref $_[0] eq 'HASH' ? shift : {@_}; |
87f0da6a |
1141 | |
701da8c4 |
1142 | my %unique_constraints = $self->result_source->unique_constraints; |
87f0da6a |
1143 | my @constraint_names = (exists $attrs->{key} |
1144 | ? ($attrs->{key}) |
1145 | : keys %unique_constraints); |
1146 | |
1147 | my @unique_hashes; |
1148 | foreach my $name (@constraint_names) { |
1149 | my @unique_cols = @{ $unique_constraints{$name} }; |
1150 | my %unique_hash = |
1151 | map { $_ => $hash->{$_} } |
1152 | grep { exists $hash->{$_} } |
1153 | @unique_cols; |
1154 | |
1155 | push @unique_hashes, \%unique_hash |
1156 | if (scalar keys %unique_hash == scalar @unique_cols); |
1157 | } |
1158 | |
87f0da6a |
1159 | if (@unique_hashes) { |
223aea40 |
1160 | my $row = $self->single(\@unique_hashes); |
1161 | if (defined $row) { |
d3c946a0 |
1162 | $row->update($hash); |
223aea40 |
1163 | return $row; |
87f0da6a |
1164 | } |
1165 | } |
1166 | |
223aea40 |
1167 | return $self->create($hash); |
87f0da6a |
1168 | } |
1169 | |
64acc2bc |
1170 | =head2 get_cache |
1171 | |
a031138b |
1172 | =over 4 |
1173 | |
1174 | =item Arguments: none |
1175 | |
1176 | =item Return Value: \@cache_objects? |
1177 | |
1178 | =back |
1179 | |
2053ab2a |
1180 | Gets the contents of the cache for the resultset, if the cache is set. |
64acc2bc |
1181 | |
1182 | =cut |
1183 | |
1184 | sub get_cache { |
0823196c |
1185 | shift->{all_cache}; |
64acc2bc |
1186 | } |
1187 | |
1188 | =head2 set_cache |
1189 | |
a031138b |
1190 | =over 4 |
1191 | |
1192 | =item Arguments: \@cache_objects |
1193 | |
1194 | =item Return Value: \@cache_objects |
1195 | |
1196 | =back |
1197 | |
aa1088bf |
1198 | Sets the contents of the cache for the resultset. Expects an arrayref |
a031138b |
1199 | of objects of the same class as those produced by the resultset. Note that |
1200 | if the cache is set the resultset will return the cached objects rather |
1201 | than re-querying the database even if the cache attr is not set. |
64acc2bc |
1202 | |
1203 | =cut |
1204 | |
1205 | sub set_cache { |
1206 | my ( $self, $data ) = @_; |
1207 | $self->throw_exception("set_cache requires an arrayref") |
0823196c |
1208 | if defined($data) && (ref $data ne 'ARRAY'); |
64acc2bc |
1209 | $self->{all_cache} = $data; |
1210 | } |
1211 | |
1212 | =head2 clear_cache |
1213 | |
a031138b |
1214 | =over 4 |
1215 | |
1216 | =item Arguments: none |
1217 | |
1218 | =item Return Value: [] |
1219 | |
1220 | =back |
1221 | |
64acc2bc |
1222 | Clears the cache for the resultset. |
1223 | |
1224 | =cut |
1225 | |
1226 | sub clear_cache { |
0823196c |
1227 | shift->set_cache(undef); |
64acc2bc |
1228 | } |
1229 | |
1230 | =head2 related_resultset |
1231 | |
a031138b |
1232 | =over 4 |
1233 | |
1234 | =item Arguments: $relationship_name |
1235 | |
1236 | =item Return Value: $resultset |
1237 | |
1238 | =back |
1239 | |
64acc2bc |
1240 | Returns a related resultset for the supplied relationship name. |
1241 | |
24d67825 |
1242 | $artist_rs = $schema->resultset('CD')->related_resultset('Artist'); |
64acc2bc |
1243 | |
1244 | =cut |
1245 | |
1246 | sub related_resultset { |
a031138b |
1247 | my ( $self, $rel ) = @_; |
64acc2bc |
1248 | $self->{related_resultsets} ||= {}; |
223aea40 |
1249 | return $self->{related_resultsets}{$rel} ||= do { |
1250 | #warn "fetching related resultset for rel '$rel'"; |
1251 | my $rel_obj = $self->result_source->relationship_info($rel); |
1252 | $self->throw_exception( |
1253 | "search_related: result source '" . $self->result_source->name . |
1254 | "' has no such relationship ${rel}") |
1255 | unless $rel_obj; #die Dumper $self->{attrs}; |
1256 | |
1257 | my $rs = $self->search(undef, { join => $rel }); |
1258 | my $alias = defined $rs->{attrs}{seen_join}{$rel} |
1259 | && $rs->{attrs}{seen_join}{$rel} > 1 |
1260 | ? join('_', $rel, $rs->{attrs}{seen_join}{$rel}) |
1261 | : $rel; |
1262 | |
64acc2bc |
1263 | $self->result_source->schema->resultset($rel_obj->{class} |
1264 | )->search( undef, |
1265 | { %{$rs->{attrs}}, |
1266 | alias => $alias, |
223aea40 |
1267 | select => undef, |
1268 | as => undef } |
a031138b |
1269 | ); |
223aea40 |
1270 | }; |
64acc2bc |
1271 | } |
1272 | |
701da8c4 |
1273 | =head2 throw_exception |
1274 | |
a031138b |
1275 | See L<DBIx::Class::Schema/throw_exception> for details. |
701da8c4 |
1276 | |
1277 | =cut |
1278 | |
1279 | sub throw_exception { |
1280 | my $self=shift; |
1281 | $self->result_source->schema->throw_exception(@_); |
1282 | } |
1283 | |
a031138b |
1284 | # XXX: FIXME: Attributes docs need clearing up |
076652e8 |
1285 | |
a031138b |
1286 | =head1 ATTRIBUTES |
27f01d1f |
1287 | |
a33df5d4 |
1288 | The resultset takes various attributes that modify its behavior. Here's an |
1289 | overview of them: |
bfab575a |
1290 | |
1291 | =head2 order_by |
076652e8 |
1292 | |
a031138b |
1293 | =over 4 |
1294 | |
1295 | =item Value: ($order_by | \@order_by) |
1296 | |
eaefb953 |
1297 | =back |
1298 | |
24d67825 |
1299 | Which column(s) to order the results by. This is currently passed |
1300 | through directly to SQL, so you can give e.g. C<year DESC> for a |
1301 | descending order on the column `year'. |
076652e8 |
1302 | |
5e8b1b2a |
1303 | =head2 columns |
87c4e602 |
1304 | |
27f01d1f |
1305 | =over 4 |
1306 | |
a031138b |
1307 | =item Value: \@columns |
27f01d1f |
1308 | |
1309 | =back |
976f3686 |
1310 | |
a33df5d4 |
1311 | Shortcut to request a particular set of columns to be retrieved. Adds |
1312 | C<me.> onto the start of any column without a C<.> in it and sets C<select> |
5e8b1b2a |
1313 | from that, then auto-populates C<as> from C<select> as normal. (You may also |
1314 | use the C<cols> attribute, as in earlier versions of DBIC.) |
976f3686 |
1315 | |
87c4e602 |
1316 | =head2 include_columns |
1317 | |
27f01d1f |
1318 | =over 4 |
1319 | |
a031138b |
1320 | =item Value: \@columns |
27f01d1f |
1321 | |
1322 | =back |
5ac6a044 |
1323 | |
1324 | Shortcut to include additional columns in the returned results - for example |
1325 | |
24d67825 |
1326 | $schema->resultset('CD')->search(undef, { |
1327 | include_columns => ['artist.name'], |
1328 | join => ['artist'] |
1329 | }); |
5ac6a044 |
1330 | |
24d67825 |
1331 | would return all CDs and include a 'name' column to the information |
1332 | passed to object inflation |
5ac6a044 |
1333 | |
87c4e602 |
1334 | =head2 select |
1335 | |
27f01d1f |
1336 | =over 4 |
1337 | |
a031138b |
1338 | =item Value: \@select_columns |
27f01d1f |
1339 | |
1340 | =back |
976f3686 |
1341 | |
4a28c340 |
1342 | Indicates which columns should be selected from the storage. You can use |
1343 | column names, or in the case of RDBMS back ends, function or stored procedure |
1344 | names: |
1345 | |
24d67825 |
1346 | $rs = $schema->resultset('Employee')->search(undef, { |
1347 | select => [ |
1348 | 'name', |
1349 | { count => 'employeeid' }, |
1350 | { sum => 'salary' } |
1351 | ] |
1352 | }); |
4a28c340 |
1353 | |
1354 | When you use function/stored procedure names and do not supply an C<as> |
1355 | attribute, the column names returned are storage-dependent. E.g. MySQL would |
24d67825 |
1356 | return a column named C<count(employeeid)> in the above example. |
976f3686 |
1357 | |
87c4e602 |
1358 | =head2 as |
1359 | |
27f01d1f |
1360 | =over 4 |
1361 | |
a031138b |
1362 | =item Value: \@inflation_names |
27f01d1f |
1363 | |
1364 | =back |
076652e8 |
1365 | |
4a28c340 |
1366 | Indicates column names for object inflation. This is used in conjunction with |
1367 | C<select>, usually when C<select> contains one or more function or stored |
1368 | procedure names: |
1369 | |
24d67825 |
1370 | $rs = $schema->resultset('Employee')->search(undef, { |
1371 | select => [ |
1372 | 'name', |
1373 | { count => 'employeeid' } |
1374 | ], |
a0638a7b |
1375 | as => ['name', 'employee_count'], |
24d67825 |
1376 | }); |
4a28c340 |
1377 | |
24d67825 |
1378 | my $employee = $rs->first(); # get the first Employee |
4a28c340 |
1379 | |
1380 | If the object against which the search is performed already has an accessor |
1381 | matching a column name specified in C<as>, the value can be retrieved using |
1382 | the accessor as normal: |
1383 | |
24d67825 |
1384 | my $name = $employee->name(); |
4a28c340 |
1385 | |
1386 | If on the other hand an accessor does not exist in the object, you need to |
1387 | use C<get_column> instead: |
1388 | |
24d67825 |
1389 | my $employee_count = $employee->get_column('employee_count'); |
4a28c340 |
1390 | |
1391 | You can create your own accessors if required - see |
1392 | L<DBIx::Class::Manual::Cookbook> for details. |
ee38fa40 |
1393 | |
bfab575a |
1394 | =head2 join |
ee38fa40 |
1395 | |
a031138b |
1396 | =over 4 |
1397 | |
1398 | =item Value: ($rel_name | \@rel_names | \%rel_names) |
1399 | |
1400 | =back |
1401 | |
a33df5d4 |
1402 | Contains a list of relationships that should be joined for this query. For |
1403 | example: |
1404 | |
1405 | # Get CDs by Nine Inch Nails |
1406 | my $rs = $schema->resultset('CD')->search( |
1407 | { 'artist.name' => 'Nine Inch Nails' }, |
1408 | { join => 'artist' } |
1409 | ); |
1410 | |
1411 | Can also contain a hash reference to refer to the other relation's relations. |
1412 | For example: |
1413 | |
1414 | package MyApp::Schema::Track; |
1415 | use base qw/DBIx::Class/; |
1416 | __PACKAGE__->table('track'); |
1417 | __PACKAGE__->add_columns(qw/trackid cd position title/); |
1418 | __PACKAGE__->set_primary_key('trackid'); |
1419 | __PACKAGE__->belongs_to(cd => 'MyApp::Schema::CD'); |
1420 | 1; |
1421 | |
1422 | # In your application |
1423 | my $rs = $schema->resultset('Artist')->search( |
1424 | { 'track.title' => 'Teardrop' }, |
1425 | { |
1426 | join => { cd => 'track' }, |
1427 | order_by => 'artist.name', |
1428 | } |
1429 | ); |
1430 | |
2cb360cc |
1431 | If the same join is supplied twice, it will be aliased to <rel>_2 (and |
1432 | similarly for a third time). For e.g. |
1433 | |
24d67825 |
1434 | my $rs = $schema->resultset('Artist')->search({ |
1435 | 'cds.title' => 'Down to Earth', |
1436 | 'cds_2.title' => 'Popular', |
1437 | }, { |
1438 | join => [ qw/cds cds/ ], |
1439 | }); |
2cb360cc |
1440 | |
24d67825 |
1441 | will return a set of all artists that have both a cd with title 'Down |
1442 | to Earth' and a cd with title 'Popular'. |
2cb360cc |
1443 | |
1444 | If you want to fetch related objects from other tables as well, see C<prefetch> |
ae1c90a1 |
1445 | below. |
ee38fa40 |
1446 | |
87c4e602 |
1447 | =head2 prefetch |
1448 | |
27f01d1f |
1449 | =over 4 |
1450 | |
a031138b |
1451 | =item Value: ($rel_name | \@rel_names | \%rel_names) |
27f01d1f |
1452 | |
1453 | =back |
ee38fa40 |
1454 | |
75d07914 |
1455 | Contains one or more relationships that should be fetched along with the main |
bfab575a |
1456 | query (when they are accessed afterwards they will have already been |
a33df5d4 |
1457 | "prefetched"). This is useful for when you know you will need the related |
ae1c90a1 |
1458 | objects, because it saves at least one query: |
1459 | |
1460 | my $rs = $schema->resultset('Tag')->search( |
5e8b1b2a |
1461 | undef, |
ae1c90a1 |
1462 | { |
1463 | prefetch => { |
1464 | cd => 'artist' |
1465 | } |
1466 | } |
1467 | ); |
1468 | |
1469 | The initial search results in SQL like the following: |
1470 | |
1471 | SELECT tag.*, cd.*, artist.* FROM tag |
1472 | JOIN cd ON tag.cd = cd.cdid |
1473 | JOIN artist ON cd.artist = artist.artistid |
1474 | |
1475 | L<DBIx::Class> has no need to go back to the database when we access the |
1476 | C<cd> or C<artist> relationships, which saves us two SQL statements in this |
1477 | case. |
1478 | |
2cb360cc |
1479 | Simple prefetches will be joined automatically, so there is no need |
1480 | for a C<join> attribute in the above search. If you're prefetching to |
1481 | depth (e.g. { cd => { artist => 'label' } or similar), you'll need to |
1482 | specify the join as well. |
ae1c90a1 |
1483 | |
1484 | C<prefetch> can be used with the following relationship types: C<belongs_to>, |
2cb360cc |
1485 | C<has_one> (or if you're using C<add_relationship>, any relationship declared |
1486 | with an accessor type of 'single' or 'filter'). |
ee38fa40 |
1487 | |
87c4e602 |
1488 | =head2 from |
1489 | |
27f01d1f |
1490 | =over 4 |
1491 | |
a031138b |
1492 | =item Value: \@from_clause |
27f01d1f |
1493 | |
1494 | =back |
ee38fa40 |
1495 | |
4a28c340 |
1496 | The C<from> attribute gives you manual control over the C<FROM> clause of SQL |
1497 | statements generated by L<DBIx::Class>, allowing you to express custom C<JOIN> |
1498 | clauses. |
ee38fa40 |
1499 | |
a33df5d4 |
1500 | NOTE: Use this on your own risk. This allows you to shoot off your foot! |
4a28c340 |
1501 | C<join> will usually do what you need and it is strongly recommended that you |
1502 | avoid using C<from> unless you cannot achieve the desired result using C<join>. |
1503 | |
1504 | In simple terms, C<from> works as follows: |
1505 | |
1506 | [ |
abaf89a9 |
1507 | { <alias> => <table>, -join_type => 'inner|left|right' } |
4a28c340 |
1508 | [] # nested JOIN (optional) |
493a7fb0 |
1509 | { <table.column> => <foreign_table.foreign_key> } |
4a28c340 |
1510 | ] |
1511 | |
1512 | JOIN |
1513 | <alias> <table> |
1514 | [JOIN ...] |
1515 | ON <table.column> = <foreign_table.foreign_key> |
1516 | |
1517 | An easy way to follow the examples below is to remember the following: |
1518 | |
1519 | Anything inside "[]" is a JOIN |
1520 | Anything inside "{}" is a condition for the enclosing JOIN |
1521 | |
1522 | The following examples utilize a "person" table in a family tree application. |
1523 | In order to express parent->child relationships, this table is self-joined: |
1524 | |
1525 | # Person->belongs_to('father' => 'Person'); |
1526 | # Person->belongs_to('mother' => 'Person'); |
1527 | |
1528 | C<from> can be used to nest joins. Here we return all children with a father, |
1529 | then search against all mothers of those children: |
1530 | |
1531 | $rs = $schema->resultset('Person')->search( |
5e8b1b2a |
1532 | undef, |
4a28c340 |
1533 | { |
1534 | alias => 'mother', # alias columns in accordance with "from" |
1535 | from => [ |
1536 | { mother => 'person' }, |
1537 | [ |
1538 | [ |
1539 | { child => 'person' }, |
1540 | [ |
1541 | { father => 'person' }, |
1542 | { 'father.person_id' => 'child.father_id' } |
1543 | ] |
1544 | ], |
1545 | { 'mother.person_id' => 'child.mother_id' } |
fd9f5466 |
1546 | ], |
4a28c340 |
1547 | ] |
1548 | }, |
1549 | ); |
1550 | |
1551 | # Equivalent SQL: |
1552 | # SELECT mother.* FROM person mother |
1553 | # JOIN ( |
1554 | # person child |
1555 | # JOIN person father |
1556 | # ON ( father.person_id = child.father_id ) |
1557 | # ) |
1558 | # ON ( mother.person_id = child.mother_id ) |
1559 | |
1560 | The type of any join can be controlled manually. To search against only people |
1561 | with a father in the person table, we could explicitly use C<INNER JOIN>: |
1562 | |
1563 | $rs = $schema->resultset('Person')->search( |
5e8b1b2a |
1564 | undef, |
4a28c340 |
1565 | { |
1566 | alias => 'child', # alias columns in accordance with "from" |
1567 | from => [ |
1568 | { child => 'person' }, |
1569 | [ |
abaf89a9 |
1570 | { father => 'person', -join_type => 'inner' }, |
4a28c340 |
1571 | { 'father.id' => 'child.father_id' } |
1572 | ], |
1573 | ] |
1574 | }, |
1575 | ); |
1576 | |
1577 | # Equivalent SQL: |
1578 | # SELECT child.* FROM person child |
1579 | # INNER JOIN person father ON child.father_id = father.id |
ee38fa40 |
1580 | |
bfab575a |
1581 | =head2 page |
076652e8 |
1582 | |
27f01d1f |
1583 | =over 4 |
1584 | |
a031138b |
1585 | =item Value: $page |
27f01d1f |
1586 | |
1587 | =back |
1588 | |
a031138b |
1589 | Makes the resultset paged and specifies the page to retrieve. Effectively |
1590 | identical to creating a non-pages resultset and then calling ->page($page) |
1591 | on it. |
076652e8 |
1592 | |
bfab575a |
1593 | =head2 rows |
076652e8 |
1594 | |
27f01d1f |
1595 | =over 4 |
1596 | |
a031138b |
1597 | =item Value: $rows |
27f01d1f |
1598 | |
1599 | =back |
1600 | |
a031138b |
1601 | Specifes the maximum number of rows for direct retrieval or the number of |
1602 | rows per page if the page attribute or method is used. |
076652e8 |
1603 | |
87c4e602 |
1604 | =head2 group_by |
1605 | |
27f01d1f |
1606 | =over 4 |
1607 | |
a031138b |
1608 | =item Value: \@columns |
27f01d1f |
1609 | |
1610 | =back |
54540863 |
1611 | |
bda4c2b8 |
1612 | A arrayref of columns to group by. Can include columns of joined tables. |
54540863 |
1613 | |
675ce4a6 |
1614 | group_by => [qw/ column1 column2 ... /] |
1615 | |
ea1eaf8d |
1616 | =head2 having |
1617 | |
1618 | =over 4 |
1619 | |
1620 | =item Value: $condition |
1621 | |
1622 | =back |
1623 | |
1624 | HAVING is a select statement attribute that is applied between GROUP BY and |
1625 | ORDER BY. It is applied to the after the grouping calculations have been |
1626 | done. |
1627 | |
1628 | having => { 'count(employee)' => { '>=', 100 } } |
1629 | |
54540863 |
1630 | =head2 distinct |
1631 | |
a031138b |
1632 | =over 4 |
1633 | |
1634 | =item Value: (0 | 1) |
1635 | |
1636 | =back |
1637 | |
a33df5d4 |
1638 | Set to 1 to group by all columns. |
1639 | |
534ca143 |
1640 | =head2 cache |
1641 | |
1642 | Set to 1 to cache search results. This prevents extra SQL queries if you |
1643 | revisit rows in your ResultSet: |
1644 | |
1645 | my $resultset = $schema->resultset('Artist')->search( undef, { cache => 1 } ); |
1646 | |
1647 | while( my $artist = $resultset->next ) { |
1648 | ... do stuff ... |
1649 | } |
1650 | |
75d07914 |
1651 | $rs->first; # without cache, this would issue a query |
534ca143 |
1652 | |
1653 | By default, searches are not cached. |
1654 | |
a33df5d4 |
1655 | For more examples of using these attributes, see |
1656 | L<DBIx::Class::Manual::Cookbook>. |
54540863 |
1657 | |
bfab575a |
1658 | =cut |
076652e8 |
1659 | |
89c0a5a2 |
1660 | 1; |