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