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9c992ba1 |
1 | package DBIx::Class::ResultSource; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | use DBIx::Class::ResultSet; |
7 | |
8 | use Carp qw/croak/; |
9 | |
10 | use base qw/DBIx::Class/; |
11 | __PACKAGE__->load_components(qw/AccessorGroup/); |
12 | |
13 | __PACKAGE__->mk_group_accessors('simple' => |
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14 | qw/_ordered_columns _columns _primaries _unique_constraints name resultset_class result_class schema from _relationships/); |
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15 | |
16 | =head1 NAME |
17 | |
18 | DBIx::Class::ResultSource - Result source object |
19 | |
20 | =head1 SYNOPSIS |
21 | |
22 | =head1 DESCRIPTION |
23 | |
24 | A ResultSource is a component of a schema from which results can be directly |
25 | retrieved, most usually a table (see L<DBIx::Class::ResultSource::Table>) |
26 | |
27 | =head1 METHODS |
28 | |
29 | =cut |
30 | |
31 | sub new { |
32 | my ($class, $attrs) = @_; |
33 | $class = ref $class if ref $class; |
34 | my $new = bless({ %{$attrs || {}} }, $class); |
35 | $new->{resultset_class} ||= 'DBIx::Class::ResultSet'; |
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36 | $new->{_ordered_columns} ||= []; |
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37 | $new->{_columns} ||= {}; |
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38 | $new->{_relationships} ||= {}; |
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39 | $new->{name} ||= "!!NAME NOT SET!!"; |
40 | return $new; |
41 | } |
42 | |
43 | sub add_columns { |
44 | my ($self, @cols) = @_; |
571dced3 |
45 | $self->_ordered_columns( \@cols ) |
46 | if !$self->_ordered_columns; |
20518cb4 |
47 | my @added; |
48 | my $columns = $self->_columns; |
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49 | while (my $col = shift @cols) { |
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50 | |
30126ac7 |
51 | my $column_info = ref $cols[0] ? shift(@cols) : {}; |
53509665 |
52 | # If next entry is { ... } use that for the column info, if not |
53 | # use an empty hashref |
54 | |
20518cb4 |
55 | push(@added, $col) unless exists $columns->{$col}; |
56 | |
57 | $columns->{$col} = $column_info; |
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58 | } |
20518cb4 |
59 | push @{ $self->_ordered_columns }, @added; |
30126ac7 |
60 | return $self; |
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61 | } |
62 | |
63 | *add_column = \&add_columns; |
64 | |
65 | =head2 add_columns |
66 | |
67 | $table->add_columns(qw/col1 col2 col3/); |
68 | |
69 | $table->add_columns('col1' => \%col1_info, 'col2' => \%col2_info, ...); |
70 | |
71 | Adds columns to the result source. If supplied key => hashref pairs uses |
72 | the hashref as the column_info for that column. |
73 | |
74 | =head2 add_column |
75 | |
76 | $table->add_column('col' => \%info?); |
77 | |
78 | Convenience alias to add_columns |
79 | |
80 | =cut |
81 | |
82 | sub resultset { |
83 | my $self = shift; |
84 | return $self->resultset_class->new($self); |
85 | } |
86 | |
3842b955 |
87 | =head2 has_column |
88 | |
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89 | if ($obj->has_column($col)) { ... } |
90 | |
91 | Returns 1 if the source has a column of this name, 0 otherwise. |
92 | |
93 | =cut |
94 | |
95 | sub has_column { |
96 | my ($self, $column) = @_; |
97 | return exists $self->_columns->{$column}; |
98 | } |
99 | |
100 | =head2 column_info |
101 | |
102 | my $info = $obj->column_info($col); |
103 | |
104 | Returns the column metadata hashref for a column. |
105 | |
106 | =cut |
107 | |
108 | sub column_info { |
109 | my ($self, $column) = @_; |
110 | croak "No such column $column" unless exists $self->_columns->{$column}; |
a953d8d9 |
111 | if ( (! $self->_columns->{$column}->{data_type}) |
112 | && $self->schema && $self->storage() ){ |
113 | my $info; |
114 | ############ eval for the case of storage without table |
115 | eval{ |
116 | $info = $self->storage->columns_info_for ( $self->from() ); |
117 | }; |
118 | if ( ! $@ ){ |
119 | for my $col ( keys %{$self->_columns} ){ |
120 | for my $i ( keys %{$info->{$col}} ){ |
121 | $self->_columns()->{$col}->{$i} = $info->{$col}->{$i}; |
122 | } |
123 | } |
124 | } |
125 | } |
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126 | return $self->_columns->{$column}; |
127 | } |
128 | |
129 | =head2 columns |
130 | |
20518cb4 |
131 | my @column_names = $obj->columns; |
132 | |
133 | Returns all column names in the order they were declared to add_columns |
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134 | |
135 | =cut |
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136 | |
137 | sub columns { |
138 | croak "columns() is a read-only accessor, did you mean add_columns()?" if (@_ > 1); |
571dced3 |
139 | return @{shift->{_ordered_columns}||[]}; |
140 | } |
141 | |
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142 | =head2 set_primary_key(@cols) |
143 | |
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144 | Defines one or more columns as primary key for this source. Should be |
145 | called after C<add_columns>. |
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146 | |
147 | Additionally, defines a unique constraint named C<primary>. |
148 | |
149 | =cut |
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150 | |
151 | sub set_primary_key { |
152 | my ($self, @cols) = @_; |
153 | # check if primary key columns are valid columns |
154 | for (@cols) { |
155 | $self->throw("No such column $_ on table ".$self->name) |
156 | unless $self->has_column($_); |
157 | } |
158 | $self->_primaries(\@cols); |
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159 | |
160 | $self->add_unique_constraint(primary => \@cols); |
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161 | } |
162 | |
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163 | =head2 primary_columns |
164 | |
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165 | Read-only accessor which returns the list of primary keys. |
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166 | |
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167 | =cut |
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168 | |
169 | sub primary_columns { |
170 | return @{shift->_primaries||[]}; |
171 | } |
172 | |
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173 | =head2 add_unique_constraint |
174 | |
175 | Declare a unique constraint on this source. Call once for each unique |
176 | constraint. |
177 | |
178 | # For e.g. UNIQUE (column1, column2) |
179 | __PACKAGE__->add_unique_constraint(constraint_name => [ qw/column1 column2/ ]); |
180 | |
181 | =cut |
182 | |
183 | sub add_unique_constraint { |
184 | my ($self, $name, $cols) = @_; |
185 | |
186 | for (@$cols) { |
187 | $self->throw("No such column $_ on table ".$self->name) |
188 | unless $self->has_column($_); |
189 | } |
190 | |
191 | my %unique_constraints = $self->unique_constraints; |
192 | $unique_constraints{$name} = $cols; |
193 | $self->_unique_constraints(\%unique_constraints); |
194 | } |
195 | |
196 | =head2 unique_constraints |
197 | |
198 | Read-only accessor which returns the list of unique constraints on this source. |
199 | |
200 | =cut |
201 | |
202 | sub unique_constraints { |
203 | return %{shift->_unique_constraints||{}}; |
204 | } |
205 | |
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206 | =head2 from |
207 | |
208 | Returns an expression of the source to be supplied to storage to specify |
209 | retrieval from this source; in the case of a database the required FROM clause |
210 | contents. |
211 | |
212 | =cut |
213 | |
214 | =head2 storage |
215 | |
216 | Returns the storage handle for the current schema |
217 | |
218 | =cut |
219 | |
220 | sub storage { shift->schema->storage; } |
221 | |
8452e496 |
222 | =head2 add_relationship |
223 | |
224 | $source->add_relationship('relname', 'related_source', $cond, $attrs); |
225 | |
226 | The relation name can be arbitrary, but must be unique for each relationship |
227 | attached to this result source. 'related_source' should be the name with |
228 | which the related result source was registered with the current schema |
229 | (for simple schemas this is usally either Some::Namespace::Foo or just Foo) |
230 | |
231 | The condition needs to be an SQL::Abstract-style representation of the join |
232 | between the tables. For example, if you're creating a rel from Foo to Bar, |
233 | |
234 | { 'foreign.foo_id' => 'self.id' } |
235 | |
236 | will result in the JOIN clause |
237 | |
238 | foo me JOIN bar bar ON bar.foo_id = me.id |
239 | |
240 | You can specify as many foreign => self mappings as necessary. |
241 | |
242 | Valid attributes are as follows: |
243 | |
244 | =over 4 |
245 | |
246 | =item join_type |
247 | |
248 | Explicitly specifies the type of join to use in the relationship. Any SQL |
249 | join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in the SQL |
250 | command immediately before C<JOIN>. |
251 | |
252 | =item proxy |
253 | |
254 | An arrayref containing a list of accessors in the foreign class to proxy in |
255 | the main class. If, for example, you do the following: |
256 | |
257 | __PACKAGE__->might_have(bar => 'Bar', undef, { proxy => qw[/ margle /] }); |
258 | |
259 | Then, assuming Bar has an accessor named margle, you can do: |
260 | |
261 | my $obj = Foo->find(1); |
262 | $obj->margle(10); # set margle; Bar object is created if it doesn't exist |
263 | |
264 | =item accessor |
265 | |
266 | Specifies the type of accessor that should be created for the relationship. |
267 | Valid values are C<single> (for when there is only a single related object), |
268 | C<multi> (when there can be many), and C<filter> (for when there is a single |
269 | related object, but you also want the relationship accessor to double as |
270 | a column accessor). For C<multi> accessors, an add_to_* method is also |
271 | created, which calls C<create_related> for the relationship. |
272 | |
273 | =back |
274 | |
275 | =cut |
276 | |
277 | sub add_relationship { |
278 | my ($self, $rel, $f_source_name, $cond, $attrs) = @_; |
aa562407 |
279 | croak "Can't create relationship without join condition" unless $cond; |
8452e496 |
280 | $attrs ||= {}; |
87772e46 |
281 | |
8452e496 |
282 | my %rels = %{ $self->_relationships }; |
283 | $rels{$rel} = { class => $f_source_name, |
87772e46 |
284 | source => $f_source_name, |
8452e496 |
285 | cond => $cond, |
286 | attrs => $attrs }; |
287 | $self->_relationships(\%rels); |
288 | |
30126ac7 |
289 | return $self; |
87772e46 |
290 | |
953a18ef |
291 | # XXX disabled. doesn't work properly currently. skip in tests. |
292 | |
8452e496 |
293 | my $f_source = $self->schema->source($f_source_name); |
294 | unless ($f_source) { |
295 | eval "require $f_source_name;"; |
296 | if ($@) { |
297 | die $@ unless $@ =~ /Can't locate/; |
298 | } |
299 | $f_source = $f_source_name->result_source; |
87772e46 |
300 | #my $s_class = ref($self->schema); |
301 | #$f_source_name =~ m/^${s_class}::(.*)$/; |
302 | #$self->schema->register_class(($1 || $f_source_name), $f_source_name); |
303 | #$f_source = $self->schema->source($f_source_name); |
8452e496 |
304 | } |
305 | return unless $f_source; # Can't test rel without f_source |
306 | |
307 | eval { $self->resolve_join($rel, 'me') }; |
308 | |
309 | if ($@) { # If the resolve failed, back out and re-throw the error |
310 | delete $rels{$rel}; # |
311 | $self->_relationships(\%rels); |
aa562407 |
312 | croak "Error creating relationship $rel: $@"; |
8452e496 |
313 | } |
314 | 1; |
315 | } |
316 | |
317 | =head2 relationships() |
318 | |
319 | Returns all valid relationship names for this source |
320 | |
321 | =cut |
322 | |
323 | sub relationships { |
324 | return keys %{shift->_relationships}; |
325 | } |
326 | |
327 | =head2 relationship_info($relname) |
328 | |
329 | Returns the relationship information for the specified relationship name |
330 | |
331 | =cut |
332 | |
333 | sub relationship_info { |
334 | my ($self, $rel) = @_; |
335 | return $self->_relationships->{$rel}; |
336 | } |
337 | |
953a18ef |
338 | =head2 has_relationship($rel) |
339 | |
340 | Returns 1 if the source has a relationship of this name, 0 otherwise. |
341 | |
342 | =cut |
343 | |
344 | sub has_relationship { |
345 | my ($self, $rel) = @_; |
346 | return exists $self->_relationships->{$rel}; |
347 | } |
348 | |
8452e496 |
349 | =head2 resolve_join($relation) |
350 | |
351 | Returns the join structure required for the related result source |
352 | |
353 | =cut |
354 | |
355 | sub resolve_join { |
87772e46 |
356 | my ($self, $join, $alias) = @_; |
357 | if (ref $join eq 'ARRAY') { |
358 | return map { $self->resolve_join($_, $alias) } @$join; |
359 | } elsif (ref $join eq 'HASH') { |
360 | return map { $self->resolve_join($_, $alias), |
361 | $self->related_source($_)->resolve_join($join->{$_}, $_) } |
362 | keys %$join; |
363 | } elsif (ref $join) { |
aa562407 |
364 | croak ("No idea how to resolve join reftype ".ref $join); |
87772e46 |
365 | } else { |
3842b955 |
366 | my $rel_info = $self->relationship_info($join); |
aa562407 |
367 | croak("No such relationship ${join}") unless $rel_info; |
3842b955 |
368 | my $type = $rel_info->{attrs}{join_type} || ''; |
953a18ef |
369 | return [ { $join => $self->related_source($join)->from, |
370 | -join_type => $type }, |
3842b955 |
371 | $self->resolve_condition($rel_info->{cond}, $join, $alias) ]; |
953a18ef |
372 | } |
373 | } |
374 | |
3842b955 |
375 | =head2 resolve_condition($cond, $rel, $alias|$object) |
953a18ef |
376 | |
3842b955 |
377 | Resolves the passed condition to a concrete query fragment. If given an alias, |
953a18ef |
378 | returns a join condition; if given an object, inverts that object to produce |
379 | a related conditional from that object. |
380 | |
381 | =cut |
382 | |
383 | sub resolve_condition { |
3842b955 |
384 | my ($self, $cond, $rel, $for) = @_; |
953a18ef |
385 | #warn %$cond; |
386 | if (ref $cond eq 'HASH') { |
387 | my %ret; |
388 | while (my ($k, $v) = each %{$cond}) { |
389 | # XXX should probably check these are valid columns |
aa562407 |
390 | $k =~ s/^foreign\.// || croak "Invalid rel cond key ${k}"; |
391 | $v =~ s/^self\.// || croak "Invalid rel cond val ${v}"; |
953a18ef |
392 | if (ref $for) { # Object |
3842b955 |
393 | #warn "$self $k $for $v"; |
394 | $ret{$k} = $for->get_column($v); |
395 | #warn %ret; |
953a18ef |
396 | } else { |
3842b955 |
397 | $ret{"${rel}.${k}"} = "${for}.${v}"; |
953a18ef |
398 | } |
953a18ef |
399 | } |
400 | return \%ret; |
5efe4c79 |
401 | } elsif (ref $cond eq 'ARRAY') { |
402 | return [ map { $self->resolve_condition($_, $rel, $for) } @$cond ]; |
953a18ef |
403 | } else { |
404 | die("Can't handle this yet :("); |
87772e46 |
405 | } |
406 | } |
407 | |
953a18ef |
408 | |
87772e46 |
409 | =head2 related_source($relname) |
410 | |
411 | Returns the result source for the given relationship |
412 | |
413 | =cut |
414 | |
415 | sub related_source { |
416 | my ($self, $rel) = @_; |
417 | return $self->schema->source($self->relationship_info($rel)->{source}); |
8452e496 |
418 | } |
419 | |
9c992ba1 |
420 | 1; |
421 | |
422 | =head1 AUTHORS |
423 | |
424 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
425 | |
426 | =head1 LICENSE |
427 | |
428 | You may distribute this code under the same terms as Perl itself. |
429 | |
430 | =cut |
431 | |