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55e2d745 |
1 | package DBIx::Class::Relationship::Base; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
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6 | use base qw/DBIx::Class/; |
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7 | |
8 | use Scalar::Util qw/weaken blessed/; |
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9 | use Try::Tiny; |
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10 | use namespace::clean; |
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11 | |
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12 | =head1 NAME |
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13 | |
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14 | DBIx::Class::Relationship::Base - Inter-table relationships |
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15 | |
16 | =head1 SYNOPSIS |
17 | |
18 | =head1 DESCRIPTION |
19 | |
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20 | This class provides methods to describe the relationships between the |
21 | tables in your database model. These are the "bare bones" relationships |
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22 | methods, for predefined ones, look in L<DBIx::Class::Relationship>. |
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23 | |
24 | =head1 METHODS |
25 | |
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26 | =head2 add_relationship |
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27 | |
27f01d1f |
28 | =over 4 |
29 | |
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30 | =item Arguments: 'relname', 'Foreign::Class', $cond, $attrs |
27f01d1f |
31 | |
32 | =back |
30236e47 |
33 | |
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34 | __PACKAGE__->add_relationship('relname', 'Foreign::Class', $cond, $attrs); |
35 | |
406734bb |
36 | =head3 condition |
37 | |
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38 | The condition needs to be an L<SQL::Abstract>-style representation of the |
39 | join between the tables. When resolving the condition for use in a C<JOIN>, |
40 | keys using the pseudo-table C<foreign> are resolved to mean "the Table on the |
41 | other side of the relationship", and values using the pseudo-table C<self> |
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42 | are resolved to mean "the Table this class is representing". Other |
43 | restrictions, such as by value, sub-select and other tables, may also be |
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44 | used. Please check your database for C<JOIN> parameter support. |
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45 | |
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46 | For example, if you're creating a relationship from C<Author> to C<Book>, where |
47 | the C<Book> table has a column C<author_id> containing the ID of the C<Author> |
48 | row: |
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49 | |
30236e47 |
50 | { 'foreign.author_id' => 'self.id' } |
503536d5 |
51 | |
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52 | will result in the C<JOIN> clause |
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53 | |
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54 | author me JOIN book book ON book.author_id = me.id |
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55 | |
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56 | For multi-column foreign keys, you will need to specify a C<foreign>-to-C<self> |
57 | mapping for each column in the key. For example, if you're creating a |
58 | relationship from C<Book> to C<Edition>, where the C<Edition> table refers to a |
59 | publisher and a type (e.g. "paperback"): |
60 | |
61 | { |
781102cd |
62 | 'foreign.publisher_id' => 'self.publisher_id', |
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63 | 'foreign.type_id' => 'self.type_id', |
64 | } |
65 | |
66 | This will result in the C<JOIN> clause: |
67 | |
68 | book me JOIN edition edition ON edition.publisher_id = me.publisher_id |
69 | AND edition.type_id = me.type_id |
70 | |
71 | Each key-value pair provided in a hashref will be used as C<AND>ed conditions. |
72 | To add an C<OR>ed condition, use an arrayref of hashrefs. See the |
73 | L<SQL::Abstract> documentation for more details. |
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74 | |
406734bb |
75 | =head3 attributes |
76 | |
77 | The L<standard ResultSet attributes|DBIx::Class::ResultSet/ATTRIBUTES> may |
78 | be used as relationship attributes. In particular, the 'where' attribute is |
79 | useful for filtering relationships: |
80 | |
81 | __PACKAGE__->has_many( 'valid_users', 'MyApp::Schema::User', |
82 | { 'foreign.user_id' => 'self.user_id' }, |
83 | { where => { valid => 1 } } |
84 | ); |
85 | |
86 | The following attributes are also valid: |
8091aa91 |
87 | |
88 | =over 4 |
89 | |
90 | =item join_type |
91 | |
92 | Explicitly specifies the type of join to use in the relationship. Any SQL |
93 | join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in the SQL |
94 | command immediately before C<JOIN>. |
95 | |
96 | =item proxy |
97 | |
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98 | An arrayref containing a list of accessors in the foreign class to create in |
8091aa91 |
99 | the main class. If, for example, you do the following: |
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100 | |
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101 | MyDB::Schema::CD->might_have(liner_notes => 'MyDB::Schema::LinerNotes', |
102 | undef, { |
103 | proxy => [ qw/notes/ ], |
104 | }); |
d4daee7b |
105 | |
30236e47 |
106 | Then, assuming MyDB::Schema::LinerNotes has an accessor named notes, you can do: |
8091aa91 |
107 | |
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108 | my $cd = MyDB::Schema::CD->find(1); |
109 | $cd->notes('Notes go here'); # set notes -- LinerNotes object is |
110 | # created if it doesn't exist |
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111 | |
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112 | =item accessor |
113 | |
114 | Specifies the type of accessor that should be created for the relationship. |
115 | Valid values are C<single> (for when there is only a single related object), |
116 | C<multi> (when there can be many), and C<filter> (for when there is a single |
117 | related object, but you also want the relationship accessor to double as |
118 | a column accessor). For C<multi> accessors, an add_to_* method is also |
119 | created, which calls C<create_related> for the relationship. |
120 | |
3d618782 |
121 | =item is_foreign_key_constraint |
122 | |
123 | If you are using L<SQL::Translator> to create SQL for you and you find that it |
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124 | is creating constraints where it shouldn't, or not creating them where it |
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125 | should, set this attribute to a true or false value to override the detection |
126 | of when to create constraints. |
127 | |
5f7ac523 |
128 | =item cascade_copy |
129 | |
130 | If C<cascade_copy> is true on a C<has_many> relationship for an |
131 | object, then when you copy the object all the related objects will |
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132 | be copied too. To turn this behaviour off, pass C<< cascade_copy => 0 >> |
133 | in the C<$attr> hashref. |
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134 | |
135 | The behaviour defaults to C<< cascade_copy => 1 >> for C<has_many> |
136 | relationships. |
5f7ac523 |
137 | |
138 | =item cascade_delete |
139 | |
b7bbc39f |
140 | By default, DBIx::Class cascades deletes across C<has_many>, |
141 | C<has_one> and C<might_have> relationships. You can disable this |
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142 | behaviour on a per-relationship basis by supplying |
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143 | C<< cascade_delete => 0 >> in the relationship attributes. |
5f7ac523 |
144 | |
145 | The cascaded operations are performed after the requested delete, |
146 | so if your database has a constraint on the relationship, it will |
147 | have deleted/updated the related records or raised an exception |
148 | before DBIx::Class gets to perform the cascaded operation. |
149 | |
150 | =item cascade_update |
151 | |
b7bbc39f |
152 | By default, DBIx::Class cascades updates across C<has_one> and |
5f7ac523 |
153 | C<might_have> relationships. You can disable this behaviour on a |
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154 | per-relationship basis by supplying C<< cascade_update => 0 >> in |
155 | the relationship attributes. |
5f7ac523 |
156 | |
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157 | This is not a RDMS style cascade update - it purely means that when |
158 | an object has update called on it, all the related objects also |
159 | have update called. It will not change foreign keys automatically - |
160 | you must arrange to do this yourself. |
5f7ac523 |
161 | |
e377d723 |
162 | =item on_delete / on_update |
163 | |
164 | If you are using L<SQL::Translator> to create SQL for you, you can use these |
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165 | attributes to explicitly set the desired C<ON DELETE> or C<ON UPDATE> constraint |
166 | type. If not supplied the SQLT parser will attempt to infer the constraint type by |
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167 | interrogating the attributes of the B<opposite> relationship. For any 'multi' |
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168 | relationship with C<< cascade_delete => 1 >>, the corresponding belongs_to |
169 | relationship will be created with an C<ON DELETE CASCADE> constraint. For any |
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170 | relationship bearing C<< cascade_copy => 1 >> the resulting belongs_to constraint |
171 | will be C<ON UPDATE CASCADE>. If you wish to disable this autodetection, and just |
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172 | use the RDBMS' default constraint type, pass C<< on_delete => undef >> or |
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173 | C<< on_delete => '' >>, and the same for C<on_update> respectively. |
174 | |
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175 | =item is_deferrable |
176 | |
177 | Tells L<SQL::Translator> that the foreign key constraint it creates should be |
178 | deferrable. In other words, the user may request that the constraint be ignored |
179 | until the end of the transaction. Currently, only the PostgreSQL producer |
180 | actually supports this. |
181 | |
2581038c |
182 | =item add_fk_index |
183 | |
184 | Tells L<SQL::Translator> to add an index for this constraint. Can also be |
185 | specified globally in the args to L<DBIx::Class::Schema/deploy> or |
186 | L<DBIx::Class::Schema/create_ddl_dir>. Default is on, set to 0 to disable. |
187 | |
8091aa91 |
188 | =back |
189 | |
87c4e602 |
190 | =head2 register_relationship |
191 | |
27f01d1f |
192 | =over 4 |
193 | |
ebc77b53 |
194 | =item Arguments: $relname, $rel_info |
27f01d1f |
195 | |
196 | =back |
71e65b39 |
197 | |
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198 | Registers a relationship on the class. This is called internally by |
71f9df37 |
199 | DBIx::Class::ResultSourceProxy to set up Accessors and Proxies. |
71e65b39 |
200 | |
55e2d745 |
201 | =cut |
202 | |
71e65b39 |
203 | sub register_relationship { } |
204 | |
27f01d1f |
205 | =head2 related_resultset |
206 | |
207 | =over 4 |
208 | |
ebc77b53 |
209 | =item Arguments: $relationship_name |
27f01d1f |
210 | |
d601dc88 |
211 | =item Return Value: $related_resultset |
27f01d1f |
212 | |
213 | =back |
30236e47 |
214 | |
27f01d1f |
215 | $rs = $cd->related_resultset('artist'); |
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216 | |
27f01d1f |
217 | Returns a L<DBIx::Class::ResultSet> for the relationship named |
218 | $relationship_name. |
30236e47 |
219 | |
220 | =cut |
221 | |
222 | sub related_resultset { |
223 | my $self = shift; |
bc0c9800 |
224 | $self->throw_exception("Can't call *_related as class methods") |
225 | unless ref $self; |
30236e47 |
226 | my $rel = shift; |
164efde3 |
227 | my $rel_info = $self->relationship_info($rel); |
bc0c9800 |
228 | $self->throw_exception( "No such relationship ${rel}" ) |
164efde3 |
229 | unless $rel_info; |
d4daee7b |
230 | |
30236e47 |
231 | return $self->{related_resultsets}{$rel} ||= do { |
232 | my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {}); |
164efde3 |
233 | $attrs = { %{$rel_info->{attrs} || {}}, %$attrs }; |
30236e47 |
234 | |
bc0c9800 |
235 | $self->throw_exception( "Invalid query: @_" ) |
236 | if (@_ > 1 && (@_ % 2 == 1)); |
30236e47 |
237 | my $query = ((@_ > 1) ? {@_} : shift); |
238 | |
68f3b0dd |
239 | my $source = $self->result_source; |
d419ded6 |
240 | |
241 | # condition resolution may fail if an incomplete master-object prefetch |
34b6b86f |
242 | # is encountered - that is ok during prefetch construction (not yet in_storage) |
52b420dd |
243 | my $cond = try { |
244 | $source->_resolve_condition( $rel_info->{cond}, $rel, $self ) |
245 | } |
ed7ab0f4 |
246 | catch { |
34b6b86f |
247 | if ($self->in_storage) { |
ed7ab0f4 |
248 | $self->throw_exception ($_); |
34b6b86f |
249 | } |
52b420dd |
250 | |
251 | $DBIx::Class::ResultSource::UNRESOLVABLE_CONDITION; # RV |
ed7ab0f4 |
252 | }; |
d419ded6 |
253 | |
68f3b0dd |
254 | if ($cond eq $DBIx::Class::ResultSource::UNRESOLVABLE_CONDITION) { |
255 | my $reverse = $source->reverse_relationship_info($rel); |
256 | foreach my $rev_rel (keys %$reverse) { |
b82c8a28 |
257 | if ($reverse->{$rev_rel}{attrs}{accessor} && $reverse->{$rev_rel}{attrs}{accessor} eq 'multi') { |
2c5c07ec |
258 | $attrs->{related_objects}{$rev_rel} = [ $self ]; |
6298a324 |
259 | weaken $attrs->{related_object}{$rev_rel}[0]; |
2c5c07ec |
260 | } else { |
261 | $attrs->{related_objects}{$rev_rel} = $self; |
6298a324 |
262 | weaken $attrs->{related_object}{$rev_rel}; |
2c5c07ec |
263 | } |
68f3b0dd |
264 | } |
265 | } |
30236e47 |
266 | if (ref $cond eq 'ARRAY') { |
370f2ba2 |
267 | $cond = [ map { |
268 | if (ref $_ eq 'HASH') { |
269 | my $hash; |
270 | foreach my $key (keys %$_) { |
47752afe |
271 | my $newkey = $key !~ /\./ ? "me.$key" : $key; |
370f2ba2 |
272 | $hash->{$newkey} = $_->{$key}; |
273 | } |
274 | $hash; |
275 | } else { |
276 | $_; |
277 | } |
278 | } @$cond ]; |
68f3b0dd |
279 | } elsif (ref $cond eq 'HASH') { |
30236e47 |
280 | foreach my $key (grep { ! /\./ } keys %$cond) { |
281 | $cond->{"me.$key"} = delete $cond->{$key}; |
282 | } |
283 | } |
284 | $query = ($query ? { '-and' => [ $cond, $query ] } : $cond); |
bc0c9800 |
285 | $self->result_source->related_source($rel)->resultset->search( |
286 | $query, $attrs |
287 | ); |
30236e47 |
288 | }; |
289 | } |
290 | |
8091aa91 |
291 | =head2 search_related |
503536d5 |
292 | |
5b89a768 |
293 | @objects = $rs->search_related('relname', $cond, $attrs); |
294 | $objects_rs = $rs->search_related('relname', $cond, $attrs); |
30236e47 |
295 | |
296 | Run a search on a related resultset. The search will be restricted to the |
297 | item or items represented by the L<DBIx::Class::ResultSet> it was called |
298 | upon. This method can be called on a ResultSet, a Row or a ResultSource class. |
503536d5 |
299 | |
300 | =cut |
301 | |
55e2d745 |
302 | sub search_related { |
ff7bb7a1 |
303 | return shift->related_resultset(shift)->search(@_); |
b52e9bf8 |
304 | } |
305 | |
5b89a768 |
306 | =head2 search_related_rs |
307 | |
308 | ( $objects_rs ) = $rs->search_related_rs('relname', $cond, $attrs); |
309 | |
fd323bf1 |
310 | This method works exactly the same as search_related, except that |
48580715 |
311 | it guarantees a resultset, even in list context. |
5b89a768 |
312 | |
313 | =cut |
314 | |
315 | sub search_related_rs { |
316 | return shift->related_resultset(shift)->search_rs(@_); |
317 | } |
318 | |
b52e9bf8 |
319 | =head2 count_related |
320 | |
7be93b07 |
321 | $obj->count_related('relname', $cond, $attrs); |
b52e9bf8 |
322 | |
bc0c9800 |
323 | Returns the count of all the items in the related resultset, restricted by the |
324 | current item or where conditions. Can be called on a |
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325 | L<DBIx::Class::Manual::Glossary/"ResultSet"> or a |
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326 | L<DBIx::Class::Manual::Glossary/"Row"> object. |
30236e47 |
327 | |
b52e9bf8 |
328 | =cut |
329 | |
330 | sub count_related { |
331 | my $self = shift; |
332 | return $self->search_related(@_)->count; |
55e2d745 |
333 | } |
334 | |
30236e47 |
335 | =head2 new_related |
336 | |
337 | my $new_obj = $obj->new_related('relname', \%col_data); |
338 | |
339 | Create a new item of the related foreign class. If called on a |
fd323bf1 |
340 | L<Row|DBIx::Class::Manual::Glossary/"Row"> object, it will magically |
341 | set any foreign key columns of the new object to the related primary |
342 | key columns of the source object for you. The newly created item will |
479b2a6a |
343 | not be saved into your storage until you call L<DBIx::Class::Row/insert> |
30236e47 |
344 | on it. |
345 | |
346 | =cut |
347 | |
348 | sub new_related { |
349 | my ($self, $rel, $values, $attrs) = @_; |
350 | return $self->search_related($rel)->new($values, $attrs); |
351 | } |
352 | |
8091aa91 |
353 | =head2 create_related |
503536d5 |
354 | |
30236e47 |
355 | my $new_obj = $obj->create_related('relname', \%col_data); |
356 | |
357 | Creates a new item, similarly to new_related, and also inserts the item's data |
358 | into your storage medium. See the distinction between C<create> and C<new> |
359 | in L<DBIx::Class::ResultSet> for details. |
503536d5 |
360 | |
361 | =cut |
362 | |
55e2d745 |
363 | sub create_related { |
3842b955 |
364 | my $self = shift; |
fea3d045 |
365 | my $rel = shift; |
64acc2bc |
366 | my $obj = $self->search_related($rel)->create(@_); |
367 | delete $self->{related_resultsets}->{$rel}; |
368 | return $obj; |
55e2d745 |
369 | } |
370 | |
8091aa91 |
371 | =head2 find_related |
503536d5 |
372 | |
30236e47 |
373 | my $found_item = $obj->find_related('relname', @pri_vals | \%pri_vals); |
374 | |
375 | Attempt to find a related object using its primary key or unique constraints. |
27f01d1f |
376 | See L<DBIx::Class::ResultSet/find> for details. |
503536d5 |
377 | |
378 | =cut |
379 | |
1a14aa3f |
380 | sub find_related { |
381 | my $self = shift; |
382 | my $rel = shift; |
716b3d29 |
383 | return $self->search_related($rel)->find(@_); |
1a14aa3f |
384 | } |
385 | |
b3e1f1f5 |
386 | =head2 find_or_new_related |
387 | |
388 | my $new_obj = $obj->find_or_new_related('relname', \%col_data); |
389 | |
390 | Find an item of a related class. If none exists, instantiate a new item of the |
391 | related class. The object will not be saved into your storage until you call |
392 | L<DBIx::Class::Row/insert> on it. |
393 | |
394 | =cut |
395 | |
396 | sub find_or_new_related { |
397 | my $self = shift; |
e60dc79f |
398 | my $obj = $self->find_related(@_); |
399 | return defined $obj ? $obj : $self->new_related(@_); |
b3e1f1f5 |
400 | } |
401 | |
8091aa91 |
402 | =head2 find_or_create_related |
503536d5 |
403 | |
30236e47 |
404 | my $new_obj = $obj->find_or_create_related('relname', \%col_data); |
405 | |
27f01d1f |
406 | Find or create an item of a related class. See |
b3e1f1f5 |
407 | L<DBIx::Class::ResultSet/find_or_create> for details. |
503536d5 |
408 | |
409 | =cut |
410 | |
55e2d745 |
411 | sub find_or_create_related { |
412 | my $self = shift; |
9c2c91ea |
413 | my $obj = $self->find_related(@_); |
414 | return (defined($obj) ? $obj : $self->create_related(@_)); |
55e2d745 |
415 | } |
416 | |
045120e6 |
417 | =head2 update_or_create_related |
418 | |
419 | my $updated_item = $obj->update_or_create_related('relname', \%col_data, \%attrs?); |
420 | |
421 | Update or create an item of a related class. See |
f7e1846f |
422 | L<DBIx::Class::ResultSet/update_or_create> for details. |
045120e6 |
423 | |
424 | =cut |
425 | |
426 | sub update_or_create_related { |
427 | my $self = shift; |
428 | my $rel = shift; |
429 | return $self->related_resultset($rel)->update_or_create(@_); |
430 | } |
431 | |
8091aa91 |
432 | =head2 set_from_related |
503536d5 |
433 | |
30236e47 |
434 | $book->set_from_related('author', $author_obj); |
ac8e89d7 |
435 | $book->author($author_obj); ## same thing |
30236e47 |
436 | |
437 | Set column values on the current object, using related values from the given |
438 | related object. This is used to associate previously separate objects, for |
439 | example, to set the correct author for a book, find the Author object, then |
440 | call set_from_related on the book. |
441 | |
ac8e89d7 |
442 | This is called internally when you pass existing objects as values to |
48580715 |
443 | L<DBIx::Class::ResultSet/create>, or pass an object to a belongs_to accessor. |
ac8e89d7 |
444 | |
27f01d1f |
445 | The columns are only set in the local copy of the object, call L</update> to |
446 | set them in the storage. |
503536d5 |
447 | |
448 | =cut |
449 | |
55e2d745 |
450 | sub set_from_related { |
451 | my ($self, $rel, $f_obj) = @_; |
164efde3 |
452 | my $rel_info = $self->relationship_info($rel); |
453 | $self->throw_exception( "No such relationship ${rel}" ) unless $rel_info; |
454 | my $cond = $rel_info->{cond}; |
bc0c9800 |
455 | $self->throw_exception( |
456 | "set_from_related can only handle a hash condition; the ". |
457 | "condition for $rel is of type ". |
458 | (ref $cond ? ref $cond : 'plain scalar') |
459 | ) unless ref $cond eq 'HASH'; |
2c037e6b |
460 | if (defined $f_obj) { |
164efde3 |
461 | my $f_class = $rel_info->{class}; |
2c037e6b |
462 | $self->throw_exception( "Object $f_obj isn't a ".$f_class ) |
6298a324 |
463 | unless blessed $f_obj and $f_obj->isa($f_class); |
2c037e6b |
464 | } |
fde6e28e |
465 | $self->set_columns( |
6d0ee587 |
466 | $self->result_source->_resolve_condition( |
164efde3 |
467 | $rel_info->{cond}, $f_obj, $rel)); |
55e2d745 |
468 | return 1; |
469 | } |
470 | |
8091aa91 |
471 | =head2 update_from_related |
503536d5 |
472 | |
30236e47 |
473 | $book->update_from_related('author', $author_obj); |
474 | |
27f01d1f |
475 | The same as L</"set_from_related">, but the changes are immediately updated |
476 | in storage. |
503536d5 |
477 | |
478 | =cut |
479 | |
55e2d745 |
480 | sub update_from_related { |
481 | my $self = shift; |
482 | $self->set_from_related(@_); |
483 | $self->update; |
484 | } |
485 | |
8091aa91 |
486 | =head2 delete_related |
503536d5 |
487 | |
30236e47 |
488 | $obj->delete_related('relname', $cond, $attrs); |
489 | |
490 | Delete any related item subject to the given conditions. |
503536d5 |
491 | |
492 | =cut |
493 | |
55e2d745 |
494 | sub delete_related { |
495 | my $self = shift; |
64acc2bc |
496 | my $obj = $self->search_related(@_)->delete; |
497 | delete $self->{related_resultsets}->{$_[0]}; |
498 | return $obj; |
55e2d745 |
499 | } |
500 | |
ec353f53 |
501 | =head2 add_to_$rel |
502 | |
503 | B<Currently only available for C<has_many>, C<many-to-many> and 'multi' type |
504 | relationships.> |
505 | |
506 | =over 4 |
507 | |
508 | =item Arguments: ($foreign_vals | $obj), $link_vals? |
509 | |
510 | =back |
511 | |
512 | my $role = $schema->resultset('Role')->find(1); |
513 | $actor->add_to_roles($role); |
514 | # creates a My::DBIC::Schema::ActorRoles linking table row object |
515 | |
516 | $actor->add_to_roles({ name => 'lead' }, { salary => 15_000_000 }); |
517 | # creates a new My::DBIC::Schema::Role row object and the linking table |
518 | # object with an extra column in the link |
519 | |
520 | Adds a linking table object for C<$obj> or C<$foreign_vals>. If the first |
521 | argument is a hash reference, the related object is created first with the |
522 | column values in the hash. If an object reference is given, just the linking |
523 | table object is created. In either case, any additional column values for the |
524 | linking table object can be specified in C<$link_vals>. |
525 | |
526 | =head2 set_$rel |
527 | |
528 | B<Currently only available for C<many-to-many> relationships.> |
529 | |
530 | =over 4 |
531 | |
ac36a402 |
532 | =item Arguments: (\@hashrefs | \@objs), $link_vals? |
ec353f53 |
533 | |
534 | =back |
535 | |
536 | my $actor = $schema->resultset('Actor')->find(1); |
fd323bf1 |
537 | my @roles = $schema->resultset('Role')->search({ role => |
debccec3 |
538 | { '-in' => ['Fred', 'Barney'] } } ); |
ec353f53 |
539 | |
4d3a827d |
540 | $actor->set_roles(\@roles); |
541 | # Replaces all of $actor's previous roles with the two named |
ec353f53 |
542 | |
ac36a402 |
543 | $actor->set_roles(\@roles, { salary => 15_000_000 }); |
544 | # Sets a column in the link table for all roles |
545 | |
546 | |
4d3a827d |
547 | Replace all the related objects with the given reference to a list of |
548 | objects. This does a C<delete> B<on the link table resultset> to remove the |
549 | association between the current object and all related objects, then calls |
550 | C<add_to_$rel> repeatedly to link all the new objects. |
bba68c67 |
551 | |
552 | Note that this means that this method will B<not> delete any objects in the |
553 | table on the right side of the relation, merely that it will delete the link |
554 | between them. |
ec353f53 |
555 | |
4d3a827d |
556 | Due to a mistake in the original implementation of this method, it will also |
557 | accept a list of objects or hash references. This is B<deprecated> and will be |
558 | removed in a future version. |
559 | |
ec353f53 |
560 | =head2 remove_from_$rel |
561 | |
562 | B<Currently only available for C<many-to-many> relationships.> |
563 | |
564 | =over 4 |
565 | |
566 | =item Arguments: $obj |
567 | |
568 | =back |
569 | |
570 | my $role = $schema->resultset('Role')->find(1); |
571 | $actor->remove_from_roles($role); |
572 | # removes $role's My::DBIC::Schema::ActorRoles linking table row object |
573 | |
574 | Removes the link between the current object and the related object. Note that |
575 | the related object itself won't be deleted unless you call ->delete() on |
576 | it. This method just removes the link between the two objects. |
577 | |
55e2d745 |
578 | =head1 AUTHORS |
579 | |
daec44b8 |
580 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
55e2d745 |
581 | |
582 | =head1 LICENSE |
583 | |
584 | You may distribute this code under the same terms as Perl itself. |
585 | |
586 | =cut |
587 | |
4d87db01 |
588 | 1; |