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9c992ba1 |
1 | package DBIx::Class::ResultSource; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | use DBIx::Class::ResultSet; |
701da8c4 |
7 | use Carp::Clan qw/^DBIx::Class/; |
6da5894c |
8 | use Storable; |
9 | |
9c992ba1 |
10 | use base qw/DBIx::Class/; |
11 | __PACKAGE__->load_components(qw/AccessorGroup/); |
12 | |
13 | __PACKAGE__->mk_group_accessors('simple' => |
fc969005 |
14 | qw/_ordered_columns _columns _primaries _unique_constraints name resultset_attributes schema from _relationships/); |
15 | __PACKAGE__->mk_group_accessors('component_class' => qw/resultset_class result_class/); |
9c992ba1 |
16 | |
17 | =head1 NAME |
18 | |
19 | DBIx::Class::ResultSource - Result source object |
20 | |
21 | =head1 SYNOPSIS |
22 | |
23 | =head1 DESCRIPTION |
24 | |
25 | A ResultSource is a component of a schema from which results can be directly |
26 | retrieved, most usually a table (see L<DBIx::Class::ResultSource::Table>) |
27 | |
28 | =head1 METHODS |
29 | |
30 | =cut |
31 | |
32 | sub new { |
33 | my ($class, $attrs) = @_; |
34 | $class = ref $class if ref $class; |
1225fc4d |
35 | my $new = bless({ %{$attrs || {}}, _resultset => undef }, $class); |
9c992ba1 |
36 | $new->{resultset_class} ||= 'DBIx::Class::ResultSet'; |
5ac6a044 |
37 | $new->{resultset_attributes} = { %{$new->{resultset_attributes} || {}} }; |
6da5894c |
38 | $new->{_ordered_columns} = [ @{$new->{_ordered_columns}||[]}]; |
39 | $new->{_columns} = { %{$new->{_columns}||{}} }; |
40 | $new->{_relationships} = { %{$new->{_relationships}||{}} }; |
9c992ba1 |
41 | $new->{name} ||= "!!NAME NOT SET!!"; |
5afa2a15 |
42 | $new->{_columns_info_loaded} ||= 0; |
9c992ba1 |
43 | return $new; |
44 | } |
45 | |
988bf309 |
46 | =pod |
47 | |
5ac6a044 |
48 | =head2 add_columns |
49 | |
50 | $table->add_columns(qw/col1 col2 col3/); |
51 | |
52 | $table->add_columns('col1' => \%col1_info, 'col2' => \%col2_info, ...); |
53 | |
54 | Adds columns to the result source. If supplied key => hashref pairs uses |
55 | the hashref as the column_info for that column. |
56 | |
988bf309 |
57 | Repeated calls of this method will add more columns, not replace them. |
58 | |
59 | The contents of the column_info are not set in stone, the following |
60 | keys are currently recognised/used by DBIx::Class. |
61 | |
62 | =over 4 |
63 | |
64 | =item accessor |
65 | |
66 | Use this to set the name of the accessor for this column. If unset, |
67 | the name of the column will be used. |
68 | |
69 | =item data_type |
70 | |
71 | This contains the column type, it is automatically filled by the |
72 | L<SQL::Translator::Producer::DBIx::Class::File> producer, and the |
73 | L<DBIx::Class::Schema::Loader> module. If you do not enter the |
74 | data_type, DBIx::Class will attempt to retrieve it from the |
75 | database for you, using L<DBI>s column_info method. The values of this |
76 | key are typically upper-cased. |
77 | |
78 | Currently there is no standard set of values for the data_type, use |
79 | whatever your database(s) support. |
80 | |
81 | =item size |
82 | |
83 | The length of your column, if it is a column type that can have a size |
84 | restriction. This is currently not used by DBIx::Class. |
85 | |
86 | =item is_nullable |
87 | |
88 | If the column is allowed to contain NULL values, set a true value |
89 | (typically 1), here. This is currently not used by DBIx::Class. |
90 | |
91 | =item is_auto_increment |
92 | |
93 | Set this to a true value if this is a column that is somehow |
e666492c |
94 | automatically filled. This is used to determine which columns to empty |
95 | when cloning objects using C<copy>. |
988bf309 |
96 | |
97 | =item is_foreign_key |
98 | |
99 | Set this to a true value if this column represents a key from a |
100 | foreign table. This is currently not used by DBIx::Class. |
101 | |
102 | =item default_value |
103 | |
104 | Set this to the default value which will be inserted into this column |
105 | by the database. Can contain either values or functions. This is |
106 | currently not used by DBIx::Class. |
107 | |
108 | =item sequence |
109 | |
110 | If your column is using a sequence to create it's values, set the name |
111 | of the sequence here, to allow the values to be retrieved |
112 | automatically by the L<DBIx::Class::PK::Auto> module. PK::Auto will |
113 | attempt to retrieve the sequence name from the database, if this value |
114 | is left unset. |
115 | |
116 | =back |
117 | |
5ac6a044 |
118 | =head2 add_column |
119 | |
120 | $table->add_column('col' => \%info?); |
121 | |
122 | Convenience alias to add_columns |
123 | |
124 | =cut |
125 | |
9c992ba1 |
126 | sub add_columns { |
127 | my ($self, @cols) = @_; |
8e04bf91 |
128 | $self->_ordered_columns(\@cols) unless $self->_ordered_columns; |
129 | |
20518cb4 |
130 | my @added; |
131 | my $columns = $self->_columns; |
9c992ba1 |
132 | while (my $col = shift @cols) { |
8e04bf91 |
133 | # If next entry is { ... } use that for the column info, if not |
134 | # use an empty hashref |
30126ac7 |
135 | my $column_info = ref $cols[0] ? shift(@cols) : {}; |
20518cb4 |
136 | push(@added, $col) unless exists $columns->{$col}; |
20518cb4 |
137 | $columns->{$col} = $column_info; |
9c992ba1 |
138 | } |
20518cb4 |
139 | push @{ $self->_ordered_columns }, @added; |
30126ac7 |
140 | return $self; |
9c992ba1 |
141 | } |
142 | |
143 | *add_column = \&add_columns; |
144 | |
3842b955 |
145 | =head2 has_column |
146 | |
988bf309 |
147 | if ($obj->has_column($col)) { ... } |
148 | |
9c992ba1 |
149 | Returns 1 if the source has a column of this name, 0 otherwise. |
988bf309 |
150 | |
151 | =cut |
9c992ba1 |
152 | |
153 | sub has_column { |
154 | my ($self, $column) = @_; |
155 | return exists $self->_columns->{$column}; |
156 | } |
157 | |
87c4e602 |
158 | =head2 column_info |
9c992ba1 |
159 | |
988bf309 |
160 | my $info = $obj->column_info($col); |
9c992ba1 |
161 | |
988bf309 |
162 | Returns the column metadata hashref for a column. See the description |
163 | of add_column for information on the contents of the hashref. |
9c992ba1 |
164 | |
988bf309 |
165 | =cut |
9c992ba1 |
166 | |
167 | sub column_info { |
168 | my ($self, $column) = @_; |
701da8c4 |
169 | $self->throw_exception("No such column $column") |
170 | unless exists $self->_columns->{$column}; |
5afa2a15 |
171 | #warn $self->{_columns_info_loaded}, "\n"; |
8e04bf91 |
172 | if ( ! $self->_columns->{$column}{data_type} |
173 | and ! $self->{_columns_info_loaded} |
174 | and $self->schema and $self->storage ) |
175 | { |
176 | $self->{_columns_info_loaded}++; |
177 | my $info; |
178 | # eval for the case of storage without table |
179 | eval { $info = $self->storage->columns_info_for($self->from) }; |
180 | unless ($@) { |
181 | foreach my $col ( keys %{$self->_columns} ) { |
182 | foreach my $i ( keys %{$info->{$col}} ) { |
183 | $self->_columns->{$col}{$i} = $info->{$col}{$i}; |
184 | } |
a953d8d9 |
185 | } |
8e04bf91 |
186 | } |
a953d8d9 |
187 | } |
9c992ba1 |
188 | return $self->_columns->{$column}; |
189 | } |
190 | |
191 | =head2 columns |
192 | |
20518cb4 |
193 | my @column_names = $obj->columns; |
194 | |
195 | Returns all column names in the order they were declared to add_columns |
87f0da6a |
196 | |
197 | =cut |
9c992ba1 |
198 | |
199 | sub columns { |
8e04bf91 |
200 | my $self = shift; |
701da8c4 |
201 | $self->throw_exception("columns() is a read-only accessor, did you mean add_columns()?") if (@_ > 1); |
202 | return @{$self->{_ordered_columns}||[]}; |
571dced3 |
203 | } |
204 | |
87c4e602 |
205 | =head2 set_primary_key |
206 | |
207 | =head3 Arguments: (@cols) |
87f0da6a |
208 | |
9c992ba1 |
209 | Defines one or more columns as primary key for this source. Should be |
210 | called after C<add_columns>. |
87f0da6a |
211 | |
212 | Additionally, defines a unique constraint named C<primary>. |
213 | |
988bf309 |
214 | The primary key columns are used by L<DBIx::Class::PK::Auto> to |
215 | retrieve automatically created values from the database. |
216 | |
87f0da6a |
217 | =cut |
9c992ba1 |
218 | |
219 | sub set_primary_key { |
220 | my ($self, @cols) = @_; |
221 | # check if primary key columns are valid columns |
8e04bf91 |
222 | foreach my $col (@cols) { |
223 | $self->throw_exception("No such column $col on table " . $self->name) |
224 | unless $self->has_column($col); |
9c992ba1 |
225 | } |
226 | $self->_primaries(\@cols); |
87f0da6a |
227 | |
228 | $self->add_unique_constraint(primary => \@cols); |
9c992ba1 |
229 | } |
230 | |
87f0da6a |
231 | =head2 primary_columns |
232 | |
9c992ba1 |
233 | Read-only accessor which returns the list of primary keys. |
30126ac7 |
234 | |
87f0da6a |
235 | =cut |
9c992ba1 |
236 | |
237 | sub primary_columns { |
238 | return @{shift->_primaries||[]}; |
239 | } |
240 | |
87f0da6a |
241 | =head2 add_unique_constraint |
242 | |
243 | Declare a unique constraint on this source. Call once for each unique |
988bf309 |
244 | constraint. Unique constraints are used when you call C<find> on a |
958916aa |
245 | L<DBIx::Class::ResultSet>, only columns in the constraint are searched, |
87f0da6a |
246 | |
247 | # For e.g. UNIQUE (column1, column2) |
248 | __PACKAGE__->add_unique_constraint(constraint_name => [ qw/column1 column2/ ]); |
249 | |
250 | =cut |
251 | |
252 | sub add_unique_constraint { |
253 | my ($self, $name, $cols) = @_; |
254 | |
8e04bf91 |
255 | foreach my $col (@$cols) { |
256 | $self->throw_exception("No such column $col on table " . $self->name) |
257 | unless $self->has_column($col); |
87f0da6a |
258 | } |
259 | |
260 | my %unique_constraints = $self->unique_constraints; |
261 | $unique_constraints{$name} = $cols; |
262 | $self->_unique_constraints(\%unique_constraints); |
263 | } |
264 | |
265 | =head2 unique_constraints |
266 | |
267 | Read-only accessor which returns the list of unique constraints on this source. |
268 | |
269 | =cut |
270 | |
271 | sub unique_constraints { |
272 | return %{shift->_unique_constraints||{}}; |
273 | } |
274 | |
9c992ba1 |
275 | =head2 from |
276 | |
277 | Returns an expression of the source to be supplied to storage to specify |
278 | retrieval from this source; in the case of a database the required FROM clause |
279 | contents. |
280 | |
281 | =cut |
282 | |
283 | =head2 storage |
284 | |
988bf309 |
285 | Returns the storage handle for the current schema. |
286 | |
287 | See also: L<DBIx::Class::Storage> |
9c992ba1 |
288 | |
289 | =cut |
290 | |
291 | sub storage { shift->schema->storage; } |
292 | |
8452e496 |
293 | =head2 add_relationship |
294 | |
295 | $source->add_relationship('relname', 'related_source', $cond, $attrs); |
296 | |
24d67825 |
297 | The relationship name can be arbitrary, but must be unique for each |
298 | relationship attached to this result source. 'related_source' should |
299 | be the name with which the related result source was registered with |
300 | the current schema. For example: |
8452e496 |
301 | |
24d67825 |
302 | $schema->source('Book')->add_relationship('reviews', 'Review', { |
303 | 'foreign.book_id' => 'self.id', |
304 | }); |
305 | |
306 | The condition C<$cond> needs to be an SQL::Abstract-style |
307 | representation of the join between the tables. For example, if you're |
308 | creating a rel from Author to Book, |
988bf309 |
309 | |
310 | { 'foreign.author_id' => 'self.id' } |
311 | |
312 | will result in the JOIN clause |
313 | |
314 | author me JOIN book foreign ON foreign.author_id = me.id |
315 | |
8452e496 |
316 | You can specify as many foreign => self mappings as necessary. |
317 | |
988bf309 |
318 | Valid attributes are as follows: |
319 | |
320 | =over 4 |
321 | |
322 | =item join_type |
323 | |
324 | Explicitly specifies the type of join to use in the relationship. Any |
325 | SQL join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in |
326 | the SQL command immediately before C<JOIN>. |
327 | |
328 | =item proxy |
329 | |
24d67825 |
330 | An arrayref containing a list of accessors in the foreign class to proxy in |
331 | the main class. If, for example, you do the following: |
332 | |
333 | CD->might_have(liner_notes => 'LinerNotes', undef, { |
334 | proxy => [ qw/notes/ ], |
335 | }); |
336 | |
337 | Then, assuming LinerNotes has an accessor named notes, you can do: |
988bf309 |
338 | |
24d67825 |
339 | my $cd = CD->find(1); |
340 | $cd->notes('Notes go here'); # set notes -- LinerNotes object is |
341 | # created if it doesn't exist |
988bf309 |
342 | |
343 | =item accessor |
344 | |
345 | Specifies the type of accessor that should be created for the |
346 | relationship. Valid values are C<single> (for when there is only a single |
347 | related object), C<multi> (when there can be many), and C<filter> (for |
348 | when there is a single related object, but you also want the relationship |
349 | accessor to double as a column accessor). For C<multi> accessors, an |
350 | add_to_* method is also created, which calls C<create_related> for the |
351 | relationship. |
352 | |
8452e496 |
353 | =back |
354 | |
355 | =cut |
356 | |
357 | sub add_relationship { |
358 | my ($self, $rel, $f_source_name, $cond, $attrs) = @_; |
701da8c4 |
359 | $self->throw_exception("Can't create relationship without join condition") unless $cond; |
8452e496 |
360 | $attrs ||= {}; |
87772e46 |
361 | |
8452e496 |
362 | my %rels = %{ $self->_relationships }; |
363 | $rels{$rel} = { class => $f_source_name, |
87772e46 |
364 | source => $f_source_name, |
8452e496 |
365 | cond => $cond, |
366 | attrs => $attrs }; |
367 | $self->_relationships(\%rels); |
368 | |
30126ac7 |
369 | return $self; |
87772e46 |
370 | |
953a18ef |
371 | # XXX disabled. doesn't work properly currently. skip in tests. |
372 | |
8452e496 |
373 | my $f_source = $self->schema->source($f_source_name); |
374 | unless ($f_source) { |
375 | eval "require $f_source_name;"; |
376 | if ($@) { |
377 | die $@ unless $@ =~ /Can't locate/; |
378 | } |
379 | $f_source = $f_source_name->result_source; |
87772e46 |
380 | #my $s_class = ref($self->schema); |
381 | #$f_source_name =~ m/^${s_class}::(.*)$/; |
382 | #$self->schema->register_class(($1 || $f_source_name), $f_source_name); |
383 | #$f_source = $self->schema->source($f_source_name); |
8452e496 |
384 | } |
385 | return unless $f_source; # Can't test rel without f_source |
386 | |
387 | eval { $self->resolve_join($rel, 'me') }; |
388 | |
389 | if ($@) { # If the resolve failed, back out and re-throw the error |
390 | delete $rels{$rel}; # |
391 | $self->_relationships(\%rels); |
701da8c4 |
392 | $self->throw_exception("Error creating relationship $rel: $@"); |
8452e496 |
393 | } |
394 | 1; |
395 | } |
396 | |
87c4e602 |
397 | =head2 relationships |
8452e496 |
398 | |
399 | Returns all valid relationship names for this source |
400 | |
401 | =cut |
402 | |
403 | sub relationships { |
404 | return keys %{shift->_relationships}; |
405 | } |
406 | |
87c4e602 |
407 | =head2 relationship_info |
408 | |
409 | =head3 Arguments: ($relname) |
8452e496 |
410 | |
411 | Returns the relationship information for the specified relationship name |
412 | |
413 | =cut |
414 | |
415 | sub relationship_info { |
416 | my ($self, $rel) = @_; |
417 | return $self->_relationships->{$rel}; |
418 | } |
419 | |
87c4e602 |
420 | =head2 has_relationship |
421 | |
422 | =head3 Arguments: ($rel) |
953a18ef |
423 | |
424 | Returns 1 if the source has a relationship of this name, 0 otherwise. |
988bf309 |
425 | |
426 | =cut |
953a18ef |
427 | |
428 | sub has_relationship { |
429 | my ($self, $rel) = @_; |
430 | return exists $self->_relationships->{$rel}; |
431 | } |
432 | |
87c4e602 |
433 | =head2 resolve_join |
434 | |
435 | =head3 Arguments: ($relation) |
8452e496 |
436 | |
437 | Returns the join structure required for the related result source |
438 | |
439 | =cut |
440 | |
441 | sub resolve_join { |
489709af |
442 | my ($self, $join, $alias, $seen) = @_; |
443 | $seen ||= {}; |
87772e46 |
444 | if (ref $join eq 'ARRAY') { |
489709af |
445 | return map { $self->resolve_join($_, $alias, $seen) } @$join; |
87772e46 |
446 | } elsif (ref $join eq 'HASH') { |
489709af |
447 | return |
887ce227 |
448 | map { |
449 | my $as = ($seen->{$_} ? $_.'_'.($seen->{$_}+1) : $_); |
450 | ($self->resolve_join($_, $alias, $seen), |
451 | $self->related_source($_)->resolve_join($join->{$_}, $as, $seen)); |
452 | } keys %$join; |
87772e46 |
453 | } elsif (ref $join) { |
701da8c4 |
454 | $self->throw_exception("No idea how to resolve join reftype ".ref $join); |
87772e46 |
455 | } else { |
489709af |
456 | my $count = ++$seen->{$join}; |
457 | #use Data::Dumper; warn Dumper($seen); |
458 | my $as = ($count > 1 ? "${join}_${count}" : $join); |
3842b955 |
459 | my $rel_info = $self->relationship_info($join); |
701da8c4 |
460 | $self->throw_exception("No such relationship ${join}") unless $rel_info; |
3842b955 |
461 | my $type = $rel_info->{attrs}{join_type} || ''; |
489709af |
462 | return [ { $as => $self->related_source($join)->from, |
953a18ef |
463 | -join_type => $type }, |
489709af |
464 | $self->resolve_condition($rel_info->{cond}, $as, $alias) ]; |
953a18ef |
465 | } |
466 | } |
467 | |
87c4e602 |
468 | =head2 resolve_condition |
469 | |
470 | =head3 Arguments: ($cond, $as, $alias|$object) |
953a18ef |
471 | |
3842b955 |
472 | Resolves the passed condition to a concrete query fragment. If given an alias, |
953a18ef |
473 | returns a join condition; if given an object, inverts that object to produce |
474 | a related conditional from that object. |
475 | |
476 | =cut |
477 | |
478 | sub resolve_condition { |
489709af |
479 | my ($self, $cond, $as, $for) = @_; |
953a18ef |
480 | #warn %$cond; |
481 | if (ref $cond eq 'HASH') { |
482 | my %ret; |
483 | while (my ($k, $v) = each %{$cond}) { |
484 | # XXX should probably check these are valid columns |
701da8c4 |
485 | $k =~ s/^foreign\.// || $self->throw_exception("Invalid rel cond key ${k}"); |
486 | $v =~ s/^self\.// || $self->throw_exception("Invalid rel cond val ${v}"); |
953a18ef |
487 | if (ref $for) { # Object |
3842b955 |
488 | #warn "$self $k $for $v"; |
489 | $ret{$k} = $for->get_column($v); |
490 | #warn %ret; |
fde6e28e |
491 | } elsif (ref $as) { # reverse object |
492 | $ret{$v} = $as->get_column($k); |
953a18ef |
493 | } else { |
489709af |
494 | $ret{"${as}.${k}"} = "${for}.${v}"; |
953a18ef |
495 | } |
953a18ef |
496 | } |
497 | return \%ret; |
5efe4c79 |
498 | } elsif (ref $cond eq 'ARRAY') { |
489709af |
499 | return [ map { $self->resolve_condition($_, $as, $for) } @$cond ]; |
953a18ef |
500 | } else { |
501 | die("Can't handle this yet :("); |
87772e46 |
502 | } |
503 | } |
504 | |
87c4e602 |
505 | =head2 resolve_prefetch |
506 | |
507 | =head3 Arguments: (hashref/arrayref/scalar) |
988bf309 |
508 | |
b3e8ac9b |
509 | Accepts one or more relationships for the current source and returns an |
510 | array of column names for each of those relationships. Column names are |
511 | prefixed relative to the current source, in accordance with where they appear |
512 | in the supplied relationships. Examples: |
513 | |
5ac6a044 |
514 | my $source = $schema->resultset('Tag')->source; |
b3e8ac9b |
515 | @columns = $source->resolve_prefetch( { cd => 'artist' } ); |
516 | |
517 | # @columns = |
518 | #( |
519 | # 'cd.cdid', |
520 | # 'cd.artist', |
521 | # 'cd.title', |
522 | # 'cd.year', |
523 | # 'cd.artist.artistid', |
524 | # 'cd.artist.name' |
525 | #) |
526 | |
527 | @columns = $source->resolve_prefetch( qw[/ cd /] ); |
528 | |
529 | # @columns = |
530 | #( |
531 | # 'cd.cdid', |
532 | # 'cd.artist', |
533 | # 'cd.title', |
534 | # 'cd.year' |
535 | #) |
536 | |
537 | $source = $schema->resultset('CD')->source; |
538 | @columns = $source->resolve_prefetch( qw[/ artist producer /] ); |
539 | |
540 | # @columns = |
541 | #( |
542 | # 'artist.artistid', |
543 | # 'artist.name', |
544 | # 'producer.producerid', |
545 | # 'producer.name' |
546 | #) |
988bf309 |
547 | |
b3e8ac9b |
548 | =cut |
549 | |
550 | sub resolve_prefetch { |
0f66a01b |
551 | my ($self, $pre, $alias, $seen, $order, $collapse) = @_; |
489709af |
552 | $seen ||= {}; |
b3e8ac9b |
553 | #$alias ||= $self->name; |
554 | #warn $alias, Dumper $pre; |
555 | if( ref $pre eq 'ARRAY' ) { |
0f66a01b |
556 | return |
557 | map { $self->resolve_prefetch( $_, $alias, $seen, $order, $collapse ) } |
558 | @$pre; |
b3e8ac9b |
559 | } |
560 | elsif( ref $pre eq 'HASH' ) { |
561 | my @ret = |
562 | map { |
0f66a01b |
563 | $self->resolve_prefetch($_, $alias, $seen, $order, $collapse), |
489709af |
564 | $self->related_source($_)->resolve_prefetch( |
0f66a01b |
565 | $pre->{$_}, "${alias}.$_", $seen, $order, $collapse) |
566 | } keys %$pre; |
b3e8ac9b |
567 | #die Dumper \@ret; |
568 | return @ret; |
569 | } |
570 | elsif( ref $pre ) { |
a86b1efe |
571 | $self->throw_exception( |
572 | "don't know how to resolve prefetch reftype ".ref($pre)); |
b3e8ac9b |
573 | } |
574 | else { |
489709af |
575 | my $count = ++$seen->{$pre}; |
576 | my $as = ($count > 1 ? "${pre}_${count}" : $pre); |
b3e8ac9b |
577 | my $rel_info = $self->relationship_info( $pre ); |
a86b1efe |
578 | $self->throw_exception( $self->name . " has no such relationship '$pre'" ) |
579 | unless $rel_info; |
37f23589 |
580 | my $as_prefix = ($alias =~ /^.*?\.(.+)$/ ? $1.'.' : ''); |
a86b1efe |
581 | my $rel_source = $self->related_source($pre); |
0f66a01b |
582 | |
583 | if (exists $rel_info->{attrs}{accessor} |
584 | && $rel_info->{attrs}{accessor} eq 'multi') { |
585 | $self->throw_exception( |
586 | "Can't prefetch has_many ${pre} (join cond too complex)") |
587 | unless ref($rel_info->{cond}) eq 'HASH'; |
37f23589 |
588 | my @key = map { (/^foreign\.(.+)$/ ? ($1) : ()); } |
0f66a01b |
589 | keys %{$rel_info->{cond}}; |
590 | $collapse->{"${as_prefix}${pre}"} = \@key; |
5a5bec6c |
591 | my @ord = (ref($rel_info->{attrs}{order_by}) eq 'ARRAY' |
592 | ? @{$rel_info->{attrs}{order_by}} |
593 | : (defined $rel_info->{attrs}{order_by} |
594 | ? ($rel_info->{attrs}{order_by}) |
595 | : ())); |
596 | push(@$order, map { "${as}.$_" } (@key, @ord)); |
0f66a01b |
597 | } |
598 | |
489709af |
599 | return map { [ "${as}.$_", "${as_prefix}${pre}.$_", ] } |
a86b1efe |
600 | $rel_source->columns; |
b3e8ac9b |
601 | #warn $alias, Dumper (\@ret); |
489709af |
602 | #return @ret; |
b3e8ac9b |
603 | } |
604 | } |
953a18ef |
605 | |
87c4e602 |
606 | =head2 related_source |
607 | |
608 | =head3 Arguments: ($relname) |
87772e46 |
609 | |
988bf309 |
610 | Returns the result source object for the given relationship |
87772e46 |
611 | |
612 | =cut |
613 | |
614 | sub related_source { |
615 | my ($self, $rel) = @_; |
aea52c85 |
616 | if( !$self->has_relationship( $rel ) ) { |
701da8c4 |
617 | $self->throw_exception("No such relationship '$rel'"); |
aea52c85 |
618 | } |
87772e46 |
619 | return $self->schema->source($self->relationship_info($rel)->{source}); |
8452e496 |
620 | } |
621 | |
77254782 |
622 | =head2 related_class |
623 | |
624 | =head3 Arguments: ($relname) |
625 | |
626 | Returns the class object for the given relationship |
627 | |
628 | =cut |
629 | |
630 | sub related_class { |
631 | my ($self, $rel) = @_; |
632 | if( !$self->has_relationship( $rel ) ) { |
633 | $self->throw_exception("No such relationship '$rel'"); |
634 | } |
635 | return $self->schema->class($self->relationship_info($rel)->{source}); |
636 | } |
637 | |
5ac6a044 |
638 | =head2 resultset |
639 | |
bcc5a210 |
640 | Returns a resultset for the given source. This will initially be created |
641 | on demand by calling |
5ac6a044 |
642 | |
988bf309 |
643 | $self->resultset_class->new($self, $self->resultset_attributes) |
5ac6a044 |
644 | |
bcc5a210 |
645 | but is cached from then on unless resultset_class changes. |
646 | |
5ac6a044 |
647 | =head2 resultset_class |
648 | |
988bf309 |
649 | Set the class of the resultset, this is useful if you want to create your |
650 | own resultset methods. Create your own class derived from |
651 | L<DBIx::Class::ResultSet>, and set it here. |
5ac6a044 |
652 | |
653 | =head2 resultset_attributes |
654 | |
988bf309 |
655 | Specify here any attributes you wish to pass to your specialised resultset. |
5ac6a044 |
656 | |
657 | =cut |
658 | |
659 | sub resultset { |
660 | my $self = shift; |
e0f56292 |
661 | $self->throw_exception('resultset does not take any arguments. If you want another resultset, call it on the schema instead.') if scalar @_; |
1225fc4d |
662 | return $self->{_resultset} if ref $self->{_resultset} eq $self->resultset_class; |
bcd26419 |
663 | return $self->{_resultset} = $self->resultset_class->new($self, $self->{resultset_attributes}); |
5ac6a044 |
664 | } |
665 | |
701da8c4 |
666 | =head2 throw_exception |
667 | |
988bf309 |
668 | See throw_exception in L<DBIx::Class::Schema>. |
701da8c4 |
669 | |
670 | =cut |
671 | |
672 | sub throw_exception { |
673 | my $self = shift; |
674 | if (defined $self->schema) { |
675 | $self->schema->throw_exception(@_); |
676 | } else { |
677 | croak(@_); |
678 | } |
679 | } |
680 | |
681 | |
9c992ba1 |
682 | =head1 AUTHORS |
683 | |
684 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
685 | |
686 | =head1 LICENSE |
687 | |
688 | You may distribute this code under the same terms as Perl itself. |
689 | |
690 | =cut |
691 | |