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1 | package DBIx::Class::Relationship::Base; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
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6 | use Scalar::Util (); |
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7 | use base qw/DBIx::Class/; |
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8 | |
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9 | =head1 NAME |
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10 | |
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11 | DBIx::Class::Relationship::Base - Inter-table relationships |
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12 | |
13 | =head1 SYNOPSIS |
14 | |
15 | =head1 DESCRIPTION |
16 | |
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17 | This class provides methods to describe the relationships between the |
18 | tables in your database model. These are the "bare bones" relationships |
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19 | methods, for predefined ones, look in L<DBIx::Class::Relationship>. |
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20 | |
21 | =head1 METHODS |
22 | |
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23 | =head2 add_relationship |
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24 | |
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25 | =over 4 |
26 | |
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27 | =item Arguments: 'relname', 'Foreign::Class', $cond, $attrs |
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28 | |
29 | =back |
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30 | |
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31 | __PACKAGE__->add_relationship('relname', 'Foreign::Class', $cond, $attrs); |
32 | |
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33 | =head3 condition |
34 | |
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35 | The condition needs to be an L<SQL::Abstract>-style representation of the |
36 | join between the tables. When resolving the condition for use in a C<JOIN>, |
37 | keys using the pseudo-table C<foreign> are resolved to mean "the Table on the |
38 | other side of the relationship", and values using the pseudo-table C<self> |
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39 | are resolved to mean "the Table this class is representing". Other |
40 | restrictions, such as by value, sub-select and other tables, may also be |
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41 | used. Please check your database for C<JOIN> parameter support. |
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42 | |
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43 | For example, if you're creating a relationship from C<Author> to C<Book>, where |
44 | the C<Book> table has a column C<author_id> containing the ID of the C<Author> |
45 | row: |
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46 | |
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47 | { 'foreign.author_id' => 'self.id' } |
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48 | |
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49 | will result in the C<JOIN> clause |
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50 | |
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51 | author me JOIN book book ON book.author_id = me.id |
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52 | |
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53 | For multi-column foreign keys, you will need to specify a C<foreign>-to-C<self> |
54 | mapping for each column in the key. For example, if you're creating a |
55 | relationship from C<Book> to C<Edition>, where the C<Edition> table refers to a |
56 | publisher and a type (e.g. "paperback"): |
57 | |
58 | { |
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59 | 'foreign.publisher_id' => 'self.publisher_id', |
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60 | 'foreign.type_id' => 'self.type_id', |
61 | } |
62 | |
63 | This will result in the C<JOIN> clause: |
64 | |
65 | book me JOIN edition edition ON edition.publisher_id = me.publisher_id |
66 | AND edition.type_id = me.type_id |
67 | |
68 | Each key-value pair provided in a hashref will be used as C<AND>ed conditions. |
69 | To add an C<OR>ed condition, use an arrayref of hashrefs. See the |
70 | L<SQL::Abstract> documentation for more details. |
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71 | |
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72 | =head3 attributes |
73 | |
74 | The L<standard ResultSet attributes|DBIx::Class::ResultSet/ATTRIBUTES> may |
75 | be used as relationship attributes. In particular, the 'where' attribute is |
76 | useful for filtering relationships: |
77 | |
78 | __PACKAGE__->has_many( 'valid_users', 'MyApp::Schema::User', |
79 | { 'foreign.user_id' => 'self.user_id' }, |
80 | { where => { valid => 1 } } |
81 | ); |
82 | |
83 | The following attributes are also valid: |
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84 | |
85 | =over 4 |
86 | |
87 | =item join_type |
88 | |
89 | Explicitly specifies the type of join to use in the relationship. Any SQL |
90 | join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in the SQL |
91 | command immediately before C<JOIN>. |
92 | |
93 | =item proxy |
94 | |
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95 | An arrayref containing a list of accessors in the foreign class to create in |
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96 | the main class. If, for example, you do the following: |
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97 | |
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98 | MyDB::Schema::CD->might_have(liner_notes => 'MyDB::Schema::LinerNotes', |
99 | undef, { |
100 | proxy => [ qw/notes/ ], |
101 | }); |
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102 | |
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103 | Then, assuming MyDB::Schema::LinerNotes has an accessor named notes, you can do: |
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104 | |
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105 | my $cd = MyDB::Schema::CD->find(1); |
106 | $cd->notes('Notes go here'); # set notes -- LinerNotes object is |
107 | # created if it doesn't exist |
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108 | |
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109 | =item accessor |
110 | |
111 | Specifies the type of accessor that should be created for the relationship. |
112 | Valid values are C<single> (for when there is only a single related object), |
113 | C<multi> (when there can be many), and C<filter> (for when there is a single |
114 | related object, but you also want the relationship accessor to double as |
115 | a column accessor). For C<multi> accessors, an add_to_* method is also |
116 | created, which calls C<create_related> for the relationship. |
117 | |
3d618782 |
118 | =item is_foreign_key_constraint |
119 | |
120 | If you are using L<SQL::Translator> to create SQL for you and you find that it |
121 | is creating constraints where it shouldn't, or not creating them where it |
122 | should, set this attribute to a true or false value to override the detection |
123 | of when to create constraints. |
124 | |
e377d723 |
125 | =item on_delete / on_update |
126 | |
127 | If you are using L<SQL::Translator> to create SQL for you, you can use these |
128 | attributes to explicitly set the desired C<ON DELETE> or C<ON UPDATE> constraint |
129 | type. If not supplied the SQLT parser will attempt to infer the constraint type by |
130 | interrogating the attributes of the B<opposite> relationship. For any 'multi' |
131 | relationship with C<< cascade_delete => 1 >>, the corresponding belongs_to |
132 | relationship will be created with an C<ON DELETE CASCADE> constraint. For any |
133 | relationship bearing C<< cascade_copy => 1 >> the resulting belongs_to constraint |
134 | will be C<ON UPDATE CASCADE>. If you wish to disable this autodetection, and just |
135 | use the RDBMS' default constraint type, pass C<< on_delete => undef >> or |
136 | C<< on_delete => '' >>, and the same for C<on_update> respectively. |
137 | |
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138 | =item is_deferrable |
139 | |
140 | Tells L<SQL::Translator> that the foreign key constraint it creates should be |
141 | deferrable. In other words, the user may request that the constraint be ignored |
142 | until the end of the transaction. Currently, only the PostgreSQL producer |
143 | actually supports this. |
144 | |
2581038c |
145 | =item add_fk_index |
146 | |
147 | Tells L<SQL::Translator> to add an index for this constraint. Can also be |
148 | specified globally in the args to L<DBIx::Class::Schema/deploy> or |
149 | L<DBIx::Class::Schema/create_ddl_dir>. Default is on, set to 0 to disable. |
150 | |
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151 | =back |
152 | |
87c4e602 |
153 | =head2 register_relationship |
154 | |
27f01d1f |
155 | =over 4 |
156 | |
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157 | =item Arguments: $relname, $rel_info |
27f01d1f |
158 | |
159 | =back |
71e65b39 |
160 | |
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161 | Registers a relationship on the class. This is called internally by |
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162 | DBIx::Class::ResultSourceProxy to set up Accessors and Proxies. |
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163 | |
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164 | =cut |
165 | |
71e65b39 |
166 | sub register_relationship { } |
167 | |
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168 | =head2 related_resultset |
169 | |
170 | =over 4 |
171 | |
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172 | =item Arguments: $relationship_name |
27f01d1f |
173 | |
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174 | =item Return Value: $related_resultset |
27f01d1f |
175 | |
176 | =back |
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177 | |
27f01d1f |
178 | $rs = $cd->related_resultset('artist'); |
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179 | |
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180 | Returns a L<DBIx::Class::ResultSet> for the relationship named |
181 | $relationship_name. |
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182 | |
183 | =cut |
184 | |
185 | sub related_resultset { |
186 | my $self = shift; |
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187 | $self->throw_exception("Can't call *_related as class methods") |
188 | unless ref $self; |
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189 | my $rel = shift; |
164efde3 |
190 | my $rel_info = $self->relationship_info($rel); |
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191 | $self->throw_exception( "No such relationship ${rel}" ) |
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192 | unless $rel_info; |
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193 | |
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194 | return $self->{related_resultsets}{$rel} ||= do { |
195 | my $attrs = (@_ > 1 && ref $_[$#_] eq 'HASH' ? pop(@_) : {}); |
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196 | $attrs = { %{$rel_info->{attrs} || {}}, %$attrs }; |
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197 | |
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198 | $self->throw_exception( "Invalid query: @_" ) |
199 | if (@_ > 1 && (@_ % 2 == 1)); |
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200 | my $query = ((@_ > 1) ? {@_} : shift); |
201 | |
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202 | my $source = $self->result_source; |
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203 | |
204 | # condition resolution may fail if an incomplete master-object prefetch |
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205 | # is encountered - that is ok during prefetch construction (not yet in_storage) |
206 | my $cond = eval { $source->_resolve_condition( $rel_info->{cond}, $rel, $self ) }; |
207 | if (my $err = $@) { |
208 | if ($self->in_storage) { |
209 | $self->throw_exception ($err); |
210 | } |
211 | else { |
212 | $cond = $DBIx::Class::ResultSource::UNRESOLVABLE_CONDITION; |
213 | } |
214 | } |
d419ded6 |
215 | |
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216 | if ($cond eq $DBIx::Class::ResultSource::UNRESOLVABLE_CONDITION) { |
217 | my $reverse = $source->reverse_relationship_info($rel); |
218 | foreach my $rev_rel (keys %$reverse) { |
b82c8a28 |
219 | if ($reverse->{$rev_rel}{attrs}{accessor} && $reverse->{$rev_rel}{attrs}{accessor} eq 'multi') { |
2c5c07ec |
220 | $attrs->{related_objects}{$rev_rel} = [ $self ]; |
221 | Scalar::Util::weaken($attrs->{related_object}{$rev_rel}[0]); |
222 | } else { |
223 | $attrs->{related_objects}{$rev_rel} = $self; |
224 | Scalar::Util::weaken($attrs->{related_object}{$rev_rel}); |
225 | } |
68f3b0dd |
226 | } |
227 | } |
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228 | if (ref $cond eq 'ARRAY') { |
370f2ba2 |
229 | $cond = [ map { |
230 | if (ref $_ eq 'HASH') { |
231 | my $hash; |
232 | foreach my $key (keys %$_) { |
47752afe |
233 | my $newkey = $key !~ /\./ ? "me.$key" : $key; |
370f2ba2 |
234 | $hash->{$newkey} = $_->{$key}; |
235 | } |
236 | $hash; |
237 | } else { |
238 | $_; |
239 | } |
240 | } @$cond ]; |
68f3b0dd |
241 | } elsif (ref $cond eq 'HASH') { |
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242 | foreach my $key (grep { ! /\./ } keys %$cond) { |
243 | $cond->{"me.$key"} = delete $cond->{$key}; |
244 | } |
245 | } |
246 | $query = ($query ? { '-and' => [ $cond, $query ] } : $cond); |
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247 | $self->result_source->related_source($rel)->resultset->search( |
248 | $query, $attrs |
249 | ); |
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250 | }; |
251 | } |
252 | |
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253 | =head2 search_related |
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254 | |
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255 | @objects = $rs->search_related('relname', $cond, $attrs); |
256 | $objects_rs = $rs->search_related('relname', $cond, $attrs); |
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257 | |
258 | Run a search on a related resultset. The search will be restricted to the |
259 | item or items represented by the L<DBIx::Class::ResultSet> it was called |
260 | upon. This method can be called on a ResultSet, a Row or a ResultSource class. |
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261 | |
262 | =cut |
263 | |
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264 | sub search_related { |
ff7bb7a1 |
265 | return shift->related_resultset(shift)->search(@_); |
b52e9bf8 |
266 | } |
267 | |
5b89a768 |
268 | =head2 search_related_rs |
269 | |
270 | ( $objects_rs ) = $rs->search_related_rs('relname', $cond, $attrs); |
271 | |
60a8fb95 |
272 | This method works exactly the same as search_related, except that |
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273 | it guarantees a resultset, even in list context. |
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274 | |
275 | =cut |
276 | |
277 | sub search_related_rs { |
278 | return shift->related_resultset(shift)->search_rs(@_); |
279 | } |
280 | |
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281 | =head2 count_related |
282 | |
7be93b07 |
283 | $obj->count_related('relname', $cond, $attrs); |
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284 | |
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285 | Returns the count of all the items in the related resultset, restricted by the |
286 | current item or where conditions. Can be called on a |
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287 | L<DBIx::Class::Manual::Glossary/"ResultSet"> or a |
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288 | L<DBIx::Class::Manual::Glossary/"Row"> object. |
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289 | |
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290 | =cut |
291 | |
292 | sub count_related { |
293 | my $self = shift; |
294 | return $self->search_related(@_)->count; |
55e2d745 |
295 | } |
296 | |
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297 | =head2 new_related |
298 | |
299 | my $new_obj = $obj->new_related('relname', \%col_data); |
300 | |
301 | Create a new item of the related foreign class. If called on a |
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302 | L<Row|DBIx::Class::Manual::Glossary/"Row"> object, it will magically |
479b2a6a |
303 | set any foreign key columns of the new object to the related primary |
304 | key columns of the source object for you. The newly created item will |
305 | not be saved into your storage until you call L<DBIx::Class::Row/insert> |
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306 | on it. |
307 | |
308 | =cut |
309 | |
310 | sub new_related { |
311 | my ($self, $rel, $values, $attrs) = @_; |
312 | return $self->search_related($rel)->new($values, $attrs); |
313 | } |
314 | |
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315 | =head2 create_related |
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316 | |
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317 | my $new_obj = $obj->create_related('relname', \%col_data); |
318 | |
319 | Creates a new item, similarly to new_related, and also inserts the item's data |
320 | into your storage medium. See the distinction between C<create> and C<new> |
321 | in L<DBIx::Class::ResultSet> for details. |
503536d5 |
322 | |
323 | =cut |
324 | |
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325 | sub create_related { |
3842b955 |
326 | my $self = shift; |
fea3d045 |
327 | my $rel = shift; |
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328 | my $obj = $self->search_related($rel)->create(@_); |
329 | delete $self->{related_resultsets}->{$rel}; |
330 | return $obj; |
55e2d745 |
331 | } |
332 | |
8091aa91 |
333 | =head2 find_related |
503536d5 |
334 | |
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335 | my $found_item = $obj->find_related('relname', @pri_vals | \%pri_vals); |
336 | |
337 | Attempt to find a related object using its primary key or unique constraints. |
27f01d1f |
338 | See L<DBIx::Class::ResultSet/find> for details. |
503536d5 |
339 | |
340 | =cut |
341 | |
1a14aa3f |
342 | sub find_related { |
343 | my $self = shift; |
344 | my $rel = shift; |
716b3d29 |
345 | return $self->search_related($rel)->find(@_); |
1a14aa3f |
346 | } |
347 | |
b3e1f1f5 |
348 | =head2 find_or_new_related |
349 | |
350 | my $new_obj = $obj->find_or_new_related('relname', \%col_data); |
351 | |
352 | Find an item of a related class. If none exists, instantiate a new item of the |
353 | related class. The object will not be saved into your storage until you call |
354 | L<DBIx::Class::Row/insert> on it. |
355 | |
356 | =cut |
357 | |
358 | sub find_or_new_related { |
359 | my $self = shift; |
e60dc79f |
360 | my $obj = $self->find_related(@_); |
361 | return defined $obj ? $obj : $self->new_related(@_); |
b3e1f1f5 |
362 | } |
363 | |
8091aa91 |
364 | =head2 find_or_create_related |
503536d5 |
365 | |
30236e47 |
366 | my $new_obj = $obj->find_or_create_related('relname', \%col_data); |
367 | |
27f01d1f |
368 | Find or create an item of a related class. See |
b3e1f1f5 |
369 | L<DBIx::Class::ResultSet/find_or_create> for details. |
503536d5 |
370 | |
371 | =cut |
372 | |
55e2d745 |
373 | sub find_or_create_related { |
374 | my $self = shift; |
9c2c91ea |
375 | my $obj = $self->find_related(@_); |
376 | return (defined($obj) ? $obj : $self->create_related(@_)); |
55e2d745 |
377 | } |
378 | |
045120e6 |
379 | =head2 update_or_create_related |
380 | |
381 | my $updated_item = $obj->update_or_create_related('relname', \%col_data, \%attrs?); |
382 | |
383 | Update or create an item of a related class. See |
f7e1846f |
384 | L<DBIx::Class::ResultSet/update_or_create> for details. |
045120e6 |
385 | |
386 | =cut |
387 | |
388 | sub update_or_create_related { |
389 | my $self = shift; |
390 | my $rel = shift; |
391 | return $self->related_resultset($rel)->update_or_create(@_); |
392 | } |
393 | |
8091aa91 |
394 | =head2 set_from_related |
503536d5 |
395 | |
30236e47 |
396 | $book->set_from_related('author', $author_obj); |
ac8e89d7 |
397 | $book->author($author_obj); ## same thing |
30236e47 |
398 | |
399 | Set column values on the current object, using related values from the given |
400 | related object. This is used to associate previously separate objects, for |
401 | example, to set the correct author for a book, find the Author object, then |
402 | call set_from_related on the book. |
403 | |
ac8e89d7 |
404 | This is called internally when you pass existing objects as values to |
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405 | L<DBIx::Class::ResultSet/create>, or pass an object to a belongs_to accessor. |
ac8e89d7 |
406 | |
27f01d1f |
407 | The columns are only set in the local copy of the object, call L</update> to |
408 | set them in the storage. |
503536d5 |
409 | |
410 | =cut |
411 | |
55e2d745 |
412 | sub set_from_related { |
413 | my ($self, $rel, $f_obj) = @_; |
164efde3 |
414 | my $rel_info = $self->relationship_info($rel); |
415 | $self->throw_exception( "No such relationship ${rel}" ) unless $rel_info; |
416 | my $cond = $rel_info->{cond}; |
bc0c9800 |
417 | $self->throw_exception( |
418 | "set_from_related can only handle a hash condition; the ". |
419 | "condition for $rel is of type ". |
420 | (ref $cond ? ref $cond : 'plain scalar') |
421 | ) unless ref $cond eq 'HASH'; |
2c037e6b |
422 | if (defined $f_obj) { |
164efde3 |
423 | my $f_class = $rel_info->{class}; |
2c037e6b |
424 | $self->throw_exception( "Object $f_obj isn't a ".$f_class ) |
9eb32892 |
425 | unless Scalar::Util::blessed($f_obj) and $f_obj->isa($f_class); |
2c037e6b |
426 | } |
fde6e28e |
427 | $self->set_columns( |
6d0ee587 |
428 | $self->result_source->_resolve_condition( |
164efde3 |
429 | $rel_info->{cond}, $f_obj, $rel)); |
55e2d745 |
430 | return 1; |
431 | } |
432 | |
8091aa91 |
433 | =head2 update_from_related |
503536d5 |
434 | |
30236e47 |
435 | $book->update_from_related('author', $author_obj); |
436 | |
27f01d1f |
437 | The same as L</"set_from_related">, but the changes are immediately updated |
438 | in storage. |
503536d5 |
439 | |
440 | =cut |
441 | |
55e2d745 |
442 | sub update_from_related { |
443 | my $self = shift; |
444 | $self->set_from_related(@_); |
445 | $self->update; |
446 | } |
447 | |
8091aa91 |
448 | =head2 delete_related |
503536d5 |
449 | |
30236e47 |
450 | $obj->delete_related('relname', $cond, $attrs); |
451 | |
452 | Delete any related item subject to the given conditions. |
503536d5 |
453 | |
454 | =cut |
455 | |
55e2d745 |
456 | sub delete_related { |
457 | my $self = shift; |
64acc2bc |
458 | my $obj = $self->search_related(@_)->delete; |
459 | delete $self->{related_resultsets}->{$_[0]}; |
460 | return $obj; |
55e2d745 |
461 | } |
462 | |
ec353f53 |
463 | =head2 add_to_$rel |
464 | |
465 | B<Currently only available for C<has_many>, C<many-to-many> and 'multi' type |
466 | relationships.> |
467 | |
468 | =over 4 |
469 | |
470 | =item Arguments: ($foreign_vals | $obj), $link_vals? |
471 | |
472 | =back |
473 | |
474 | my $role = $schema->resultset('Role')->find(1); |
475 | $actor->add_to_roles($role); |
476 | # creates a My::DBIC::Schema::ActorRoles linking table row object |
477 | |
478 | $actor->add_to_roles({ name => 'lead' }, { salary => 15_000_000 }); |
479 | # creates a new My::DBIC::Schema::Role row object and the linking table |
480 | # object with an extra column in the link |
481 | |
482 | Adds a linking table object for C<$obj> or C<$foreign_vals>. If the first |
483 | argument is a hash reference, the related object is created first with the |
484 | column values in the hash. If an object reference is given, just the linking |
485 | table object is created. In either case, any additional column values for the |
486 | linking table object can be specified in C<$link_vals>. |
487 | |
488 | =head2 set_$rel |
489 | |
490 | B<Currently only available for C<many-to-many> relationships.> |
491 | |
492 | =over 4 |
493 | |
ac36a402 |
494 | =item Arguments: (\@hashrefs | \@objs), $link_vals? |
ec353f53 |
495 | |
496 | =back |
497 | |
498 | my $actor = $schema->resultset('Actor')->find(1); |
499 | my @roles = $schema->resultset('Role')->search({ role => |
debccec3 |
500 | { '-in' => ['Fred', 'Barney'] } } ); |
ec353f53 |
501 | |
4d3a827d |
502 | $actor->set_roles(\@roles); |
503 | # Replaces all of $actor's previous roles with the two named |
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504 | |
ac36a402 |
505 | $actor->set_roles(\@roles, { salary => 15_000_000 }); |
506 | # Sets a column in the link table for all roles |
507 | |
508 | |
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509 | Replace all the related objects with the given reference to a list of |
510 | objects. This does a C<delete> B<on the link table resultset> to remove the |
511 | association between the current object and all related objects, then calls |
512 | C<add_to_$rel> repeatedly to link all the new objects. |
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513 | |
514 | Note that this means that this method will B<not> delete any objects in the |
515 | table on the right side of the relation, merely that it will delete the link |
516 | between them. |
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517 | |
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518 | Due to a mistake in the original implementation of this method, it will also |
519 | accept a list of objects or hash references. This is B<deprecated> and will be |
520 | removed in a future version. |
521 | |
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522 | =head2 remove_from_$rel |
523 | |
524 | B<Currently only available for C<many-to-many> relationships.> |
525 | |
526 | =over 4 |
527 | |
528 | =item Arguments: $obj |
529 | |
530 | =back |
531 | |
532 | my $role = $schema->resultset('Role')->find(1); |
533 | $actor->remove_from_roles($role); |
534 | # removes $role's My::DBIC::Schema::ActorRoles linking table row object |
535 | |
536 | Removes the link between the current object and the related object. Note that |
537 | the related object itself won't be deleted unless you call ->delete() on |
538 | it. This method just removes the link between the two objects. |
539 | |
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540 | =head1 AUTHORS |
541 | |
daec44b8 |
542 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
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543 | |
544 | =head1 LICENSE |
545 | |
546 | You may distribute this code under the same terms as Perl itself. |
547 | |
548 | =cut |
549 | |
4d87db01 |
550 | 1; |