Commit | Line | Data |
9c992ba1 |
1 | package DBIx::Class::ResultSource; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | use DBIx::Class::ResultSet; |
aec3eff1 |
7 | use DBIx::Class::ResultSourceHandle; |
701da8c4 |
8 | use Carp::Clan qw/^DBIx::Class/; |
6da5894c |
9 | use Storable; |
10 | |
9c992ba1 |
11 | use base qw/DBIx::Class/; |
9c992ba1 |
12 | |
aa1088bf |
13 | __PACKAGE__->mk_group_accessors('simple' => qw/_ordered_columns |
14 | _columns _primaries _unique_constraints name resultset_attributes |
a48e92d7 |
15 | schema from _relationships column_info_from_storage source_name |
16 | source_info/); |
aa1088bf |
17 | |
3e110410 |
18 | __PACKAGE__->mk_group_accessors('inherited' => qw/resultset_class |
b0dd0e03 |
19 | result_class/); |
9c992ba1 |
20 | |
75d07914 |
21 | =head1 NAME |
9c992ba1 |
22 | |
23 | DBIx::Class::ResultSource - Result source object |
24 | |
25 | =head1 SYNOPSIS |
26 | |
27 | =head1 DESCRIPTION |
28 | |
29 | A ResultSource is a component of a schema from which results can be directly |
30 | retrieved, most usually a table (see L<DBIx::Class::ResultSource::Table>) |
31 | |
32 | =head1 METHODS |
33 | |
7eb4ecc8 |
34 | =pod |
35 | |
36 | =head2 new |
37 | |
38 | $class->new(); |
39 | |
40 | $class->new({attribute_name => value}); |
41 | |
42 | Creates a new ResultSource object. Not normally called directly by end users. |
43 | |
9c992ba1 |
44 | =cut |
45 | |
46 | sub new { |
47 | my ($class, $attrs) = @_; |
48 | $class = ref $class if ref $class; |
04786a4c |
49 | |
50 | my $new = { %{$attrs || {}}, _resultset => undef }; |
51 | bless $new, $class; |
52 | |
9c992ba1 |
53 | $new->{resultset_class} ||= 'DBIx::Class::ResultSet'; |
5ac6a044 |
54 | $new->{resultset_attributes} = { %{$new->{resultset_attributes} || {}} }; |
6da5894c |
55 | $new->{_ordered_columns} = [ @{$new->{_ordered_columns}||[]}]; |
56 | $new->{_columns} = { %{$new->{_columns}||{}} }; |
57 | $new->{_relationships} = { %{$new->{_relationships}||{}} }; |
9c992ba1 |
58 | $new->{name} ||= "!!NAME NOT SET!!"; |
5afa2a15 |
59 | $new->{_columns_info_loaded} ||= 0; |
9c992ba1 |
60 | return $new; |
61 | } |
62 | |
988bf309 |
63 | =pod |
64 | |
a48e92d7 |
65 | =head2 source_info |
66 | |
67 | Stores a hashref of per-source metadata. No specific key names |
68 | have yet been standardized, the examples below are purely hypothetical |
69 | and don't actually accomplish anything on their own: |
70 | |
71 | __PACKAGE__->source_info({ |
72 | "_tablespace" => 'fast_disk_array_3', |
73 | "_engine" => 'InnoDB', |
74 | }); |
75 | |
5ac6a044 |
76 | =head2 add_columns |
77 | |
78 | $table->add_columns(qw/col1 col2 col3/); |
79 | |
80 | $table->add_columns('col1' => \%col1_info, 'col2' => \%col2_info, ...); |
81 | |
2053ab2a |
82 | Adds columns to the result source. If supplied key => hashref pairs, uses |
83 | the hashref as the column_info for that column. Repeated calls of this |
84 | method will add more columns, not replace them. |
5ac6a044 |
85 | |
2053ab2a |
86 | The contents of the column_info are not set in stone. The following |
87 | keys are currently recognised/used by DBIx::Class: |
988bf309 |
88 | |
89 | =over 4 |
90 | |
75d07914 |
91 | =item accessor |
988bf309 |
92 | |
93 | Use this to set the name of the accessor for this column. If unset, |
94 | the name of the column will be used. |
95 | |
96 | =item data_type |
97 | |
2053ab2a |
98 | This contains the column type. It is automatically filled by the |
988bf309 |
99 | L<SQL::Translator::Producer::DBIx::Class::File> producer, and the |
2053ab2a |
100 | L<DBIx::Class::Schema::Loader> module. If you do not enter a |
988bf309 |
101 | data_type, DBIx::Class will attempt to retrieve it from the |
2053ab2a |
102 | database for you, using L<DBI>'s column_info method. The values of this |
988bf309 |
103 | key are typically upper-cased. |
104 | |
2053ab2a |
105 | Currently there is no standard set of values for the data_type. Use |
106 | whatever your database supports. |
988bf309 |
107 | |
108 | =item size |
109 | |
110 | The length of your column, if it is a column type that can have a size |
d7be2784 |
111 | restriction. This is currently only used by L<DBIx::Class::Schema/deploy>. |
988bf309 |
112 | |
113 | =item is_nullable |
114 | |
2053ab2a |
115 | Set this to a true value for a columns that is allowed to contain |
d7be2784 |
116 | NULL values. This is currently only used by L<DBIx::Class::Schema/deploy>. |
988bf309 |
117 | |
118 | =item is_auto_increment |
119 | |
2053ab2a |
120 | Set this to a true value for a column whose value is somehow |
121 | automatically set. This is used to determine which columns to empty |
d7be2784 |
122 | when cloning objects using C<copy>. It is also used by |
123 | L<DBIx::Class::Schema/deploy>. |
988bf309 |
124 | |
125 | =item is_foreign_key |
126 | |
2053ab2a |
127 | Set this to a true value for a column that contains a key from a |
d7be2784 |
128 | foreign table. This is currently only used by |
129 | L<DBIx::Class::Schema/deploy>. |
988bf309 |
130 | |
131 | =item default_value |
132 | |
2053ab2a |
133 | Set this to the default value which will be inserted into a column |
134 | by the database. Can contain either a value or a function. This is |
d7be2784 |
135 | currently only used by L<DBIx::Class::Schema/deploy>. |
988bf309 |
136 | |
137 | =item sequence |
138 | |
2053ab2a |
139 | Set this on a primary key column to the name of the sequence used to |
140 | generate a new key value. If not specified, L<DBIx::Class::PK::Auto> |
141 | will attempt to retrieve the name of the sequence from the database |
142 | automatically. |
988bf309 |
143 | |
d7be2784 |
144 | =item extras |
145 | |
146 | This is used by L<DBIx::Class::Schema/deploy> and L<SQL::Translator> |
147 | to add extra non-generic data to the column. For example: C<< extras |
148 | => { unsigned => 1} >> is used by the MySQL producer to set an integer |
149 | column to unsigned. For more details, see |
150 | L<SQL::Translator::Producer::MySQL>. |
151 | |
988bf309 |
152 | =back |
153 | |
5ac6a044 |
154 | =head2 add_column |
155 | |
156 | $table->add_column('col' => \%info?); |
157 | |
2053ab2a |
158 | Convenience alias to add_columns. |
5ac6a044 |
159 | |
160 | =cut |
161 | |
9c992ba1 |
162 | sub add_columns { |
163 | my ($self, @cols) = @_; |
8e04bf91 |
164 | $self->_ordered_columns(\@cols) unless $self->_ordered_columns; |
002a359a |
165 | |
20518cb4 |
166 | my @added; |
167 | my $columns = $self->_columns; |
9c992ba1 |
168 | while (my $col = shift @cols) { |
8e04bf91 |
169 | # If next entry is { ... } use that for the column info, if not |
170 | # use an empty hashref |
30126ac7 |
171 | my $column_info = ref $cols[0] ? shift(@cols) : {}; |
20518cb4 |
172 | push(@added, $col) unless exists $columns->{$col}; |
20518cb4 |
173 | $columns->{$col} = $column_info; |
9c992ba1 |
174 | } |
20518cb4 |
175 | push @{ $self->_ordered_columns }, @added; |
30126ac7 |
176 | return $self; |
9c992ba1 |
177 | } |
178 | |
179 | *add_column = \&add_columns; |
180 | |
3842b955 |
181 | =head2 has_column |
182 | |
988bf309 |
183 | if ($obj->has_column($col)) { ... } |
184 | |
2053ab2a |
185 | Returns true if the source has a column of this name, false otherwise. |
988bf309 |
186 | |
187 | =cut |
9c992ba1 |
188 | |
189 | sub has_column { |
190 | my ($self, $column) = @_; |
191 | return exists $self->_columns->{$column}; |
192 | } |
193 | |
87c4e602 |
194 | =head2 column_info |
9c992ba1 |
195 | |
988bf309 |
196 | my $info = $obj->column_info($col); |
9c992ba1 |
197 | |
988bf309 |
198 | Returns the column metadata hashref for a column. See the description |
199 | of add_column for information on the contents of the hashref. |
9c992ba1 |
200 | |
988bf309 |
201 | =cut |
9c992ba1 |
202 | |
203 | sub column_info { |
204 | my ($self, $column) = @_; |
75d07914 |
205 | $self->throw_exception("No such column $column") |
701da8c4 |
206 | unless exists $self->_columns->{$column}; |
5afa2a15 |
207 | #warn $self->{_columns_info_loaded}, "\n"; |
75d07914 |
208 | if ( ! $self->_columns->{$column}{data_type} |
6eda9bcf |
209 | and $self->column_info_from_storage |
75d07914 |
210 | and ! $self->{_columns_info_loaded} |
8e04bf91 |
211 | and $self->schema and $self->storage ) |
212 | { |
213 | $self->{_columns_info_loaded}++; |
d51f93c8 |
214 | my $info = {}; |
215 | my $lc_info = {}; |
75d07914 |
216 | # eval for the case of storage without table |
955f1590 |
217 | eval { $info = $self->storage->columns_info_for( $self->from ) }; |
8e04bf91 |
218 | unless ($@) { |
0b88a5bb |
219 | for my $realcol ( keys %{$info} ) { |
220 | $lc_info->{lc $realcol} = $info->{$realcol}; |
221 | } |
8e04bf91 |
222 | foreach my $col ( keys %{$self->_columns} ) { |
d51f93c8 |
223 | $self->_columns->{$col} = { |
224 | %{ $self->_columns->{$col} }, |
225 | %{ $info->{$col} || $lc_info->{lc $col} || {} } |
226 | }; |
a953d8d9 |
227 | } |
8e04bf91 |
228 | } |
a953d8d9 |
229 | } |
9c992ba1 |
230 | return $self->_columns->{$column}; |
231 | } |
232 | |
d9916234 |
233 | =head2 column_info_from_storage |
6eda9bcf |
234 | |
235 | Enables the on-demand automatic loading of the above column |
c22c7625 |
236 | metadata from storage as neccesary. This is *deprecated*, and |
237 | should not be used. It will be removed before 1.0. |
6eda9bcf |
238 | |
d9916234 |
239 | __PACKAGE__->column_info_from_storage(1); |
6eda9bcf |
240 | |
9c992ba1 |
241 | =head2 columns |
242 | |
20518cb4 |
243 | my @column_names = $obj->columns; |
244 | |
2053ab2a |
245 | Returns all column names in the order they were declared to add_columns. |
87f0da6a |
246 | |
247 | =cut |
9c992ba1 |
248 | |
249 | sub columns { |
8e04bf91 |
250 | my $self = shift; |
aa1088bf |
251 | $self->throw_exception( |
252 | "columns() is a read-only accessor, did you mean add_columns()?" |
253 | ) if (@_ > 1); |
701da8c4 |
254 | return @{$self->{_ordered_columns}||[]}; |
571dced3 |
255 | } |
256 | |
002a359a |
257 | =head2 remove_columns |
258 | |
259 | $table->remove_columns(qw/col1 col2 col3/); |
260 | |
261 | Removes columns from the result source. |
262 | |
263 | =head2 remove_column |
264 | |
265 | $table->remove_column('col'); |
266 | |
267 | Convenience alias to remove_columns. |
268 | |
269 | =cut |
270 | |
271 | sub remove_columns { |
272 | my ($self, @cols) = @_; |
273 | |
274 | return unless $self->_ordered_columns; |
275 | |
276 | my $columns = $self->_columns; |
277 | my @remaining; |
278 | |
279 | foreach my $col (@{$self->_ordered_columns}) { |
280 | push @remaining, $col unless grep(/$col/, @cols); |
281 | } |
282 | |
283 | foreach (@cols) { |
a918d901 |
284 | delete $columns->{$_}; |
002a359a |
285 | }; |
286 | |
287 | $self->_ordered_columns(\@remaining); |
288 | } |
289 | |
290 | *remove_column = \&remove_columns; |
291 | |
87c4e602 |
292 | =head2 set_primary_key |
293 | |
27f01d1f |
294 | =over 4 |
295 | |
ebc77b53 |
296 | =item Arguments: @cols |
27f01d1f |
297 | |
298 | =back |
87f0da6a |
299 | |
9c992ba1 |
300 | Defines one or more columns as primary key for this source. Should be |
301 | called after C<add_columns>. |
87f0da6a |
302 | |
303 | Additionally, defines a unique constraint named C<primary>. |
304 | |
988bf309 |
305 | The primary key columns are used by L<DBIx::Class::PK::Auto> to |
75d07914 |
306 | retrieve automatically created values from the database. |
988bf309 |
307 | |
87f0da6a |
308 | =cut |
9c992ba1 |
309 | |
310 | sub set_primary_key { |
311 | my ($self, @cols) = @_; |
312 | # check if primary key columns are valid columns |
8e04bf91 |
313 | foreach my $col (@cols) { |
314 | $self->throw_exception("No such column $col on table " . $self->name) |
315 | unless $self->has_column($col); |
9c992ba1 |
316 | } |
317 | $self->_primaries(\@cols); |
87f0da6a |
318 | |
319 | $self->add_unique_constraint(primary => \@cols); |
9c992ba1 |
320 | } |
321 | |
87f0da6a |
322 | =head2 primary_columns |
323 | |
9c992ba1 |
324 | Read-only accessor which returns the list of primary keys. |
30126ac7 |
325 | |
87f0da6a |
326 | =cut |
9c992ba1 |
327 | |
328 | sub primary_columns { |
329 | return @{shift->_primaries||[]}; |
330 | } |
331 | |
87f0da6a |
332 | =head2 add_unique_constraint |
333 | |
334 | Declare a unique constraint on this source. Call once for each unique |
58b5bb8c |
335 | constraint. |
27f01d1f |
336 | |
337 | # For UNIQUE (column1, column2) |
338 | __PACKAGE__->add_unique_constraint( |
339 | constraint_name => [ qw/column1 column2/ ], |
340 | ); |
87f0da6a |
341 | |
368a5228 |
342 | Alternatively, you can specify only the columns: |
343 | |
344 | __PACKAGE__->add_unique_constraint([ qw/column1 column2/ ]); |
345 | |
346 | This will result in a unique constraint named C<table_column1_column2>, where |
347 | C<table> is replaced with the table name. |
348 | |
58b5bb8c |
349 | Unique constraints are used, for example, when you call |
350 | L<DBIx::Class::ResultSet/find>. Only columns in the constraint are searched. |
351 | |
87f0da6a |
352 | =cut |
353 | |
354 | sub add_unique_constraint { |
368a5228 |
355 | my $self = shift; |
356 | my $cols = pop @_; |
357 | my $name = shift; |
358 | |
359 | $name ||= $self->name_unique_constraint($cols); |
87f0da6a |
360 | |
8e04bf91 |
361 | foreach my $col (@$cols) { |
362 | $self->throw_exception("No such column $col on table " . $self->name) |
363 | unless $self->has_column($col); |
87f0da6a |
364 | } |
365 | |
366 | my %unique_constraints = $self->unique_constraints; |
367 | $unique_constraints{$name} = $cols; |
368 | $self->_unique_constraints(\%unique_constraints); |
369 | } |
370 | |
d9c74322 |
371 | =head2 name_unique_constraint |
368a5228 |
372 | |
373 | Return a name for a unique constraint containing the specified columns. These |
374 | names consist of the table name and each column name, separated by underscores. |
375 | |
376 | For example, a constraint on a table named C<cd> containing the columns |
377 | C<artist> and C<title> would result in a constraint name of C<cd_artist_title>. |
378 | |
379 | =cut |
380 | |
381 | sub name_unique_constraint { |
382 | my ($self, $cols) = @_; |
383 | |
384 | return join '_', $self->name, @$cols; |
385 | } |
386 | |
87f0da6a |
387 | =head2 unique_constraints |
388 | |
389 | Read-only accessor which returns the list of unique constraints on this source. |
390 | |
391 | =cut |
392 | |
393 | sub unique_constraints { |
394 | return %{shift->_unique_constraints||{}}; |
395 | } |
396 | |
e6a0e17c |
397 | =head2 unique_constraint_names |
398 | |
399 | Returns the list of unique constraint names defined on this source. |
400 | |
401 | =cut |
402 | |
403 | sub unique_constraint_names { |
404 | my ($self) = @_; |
405 | |
406 | my %unique_constraints = $self->unique_constraints; |
407 | |
408 | return keys %unique_constraints; |
409 | } |
410 | |
411 | =head2 unique_constraint_columns |
412 | |
413 | Returns the list of columns that make up the specified unique constraint. |
414 | |
415 | =cut |
416 | |
417 | sub unique_constraint_columns { |
418 | my ($self, $constraint_name) = @_; |
419 | |
420 | my %unique_constraints = $self->unique_constraints; |
421 | |
422 | $self->throw_exception( |
423 | "Unknown unique constraint $constraint_name on '" . $self->name . "'" |
424 | ) unless exists $unique_constraints{$constraint_name}; |
425 | |
426 | return @{ $unique_constraints{$constraint_name} }; |
427 | } |
428 | |
9c992ba1 |
429 | =head2 from |
430 | |
431 | Returns an expression of the source to be supplied to storage to specify |
2053ab2a |
432 | retrieval from this source. In the case of a database, the required FROM |
433 | clause contents. |
9c992ba1 |
434 | |
f9b7bd6e |
435 | =head2 schema |
436 | |
437 | Returns the L<DBIx::Class::Schema> object that this result source |
438 | belongs too. |
9c992ba1 |
439 | |
440 | =head2 storage |
441 | |
75d07914 |
442 | Returns the storage handle for the current schema. |
988bf309 |
443 | |
444 | See also: L<DBIx::Class::Storage> |
9c992ba1 |
445 | |
446 | =cut |
447 | |
448 | sub storage { shift->schema->storage; } |
449 | |
8452e496 |
450 | =head2 add_relationship |
451 | |
452 | $source->add_relationship('relname', 'related_source', $cond, $attrs); |
453 | |
24d67825 |
454 | The relationship name can be arbitrary, but must be unique for each |
455 | relationship attached to this result source. 'related_source' should |
456 | be the name with which the related result source was registered with |
457 | the current schema. For example: |
8452e496 |
458 | |
24d67825 |
459 | $schema->source('Book')->add_relationship('reviews', 'Review', { |
460 | 'foreign.book_id' => 'self.id', |
461 | }); |
462 | |
2053ab2a |
463 | The condition C<$cond> needs to be an L<SQL::Abstract>-style |
24d67825 |
464 | representation of the join between the tables. For example, if you're |
465 | creating a rel from Author to Book, |
988bf309 |
466 | |
467 | { 'foreign.author_id' => 'self.id' } |
468 | |
469 | will result in the JOIN clause |
470 | |
471 | author me JOIN book foreign ON foreign.author_id = me.id |
472 | |
8452e496 |
473 | You can specify as many foreign => self mappings as necessary. |
474 | |
988bf309 |
475 | Valid attributes are as follows: |
476 | |
477 | =over 4 |
478 | |
479 | =item join_type |
480 | |
481 | Explicitly specifies the type of join to use in the relationship. Any |
482 | SQL join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in |
483 | the SQL command immediately before C<JOIN>. |
484 | |
485 | =item proxy |
486 | |
24d67825 |
487 | An arrayref containing a list of accessors in the foreign class to proxy in |
488 | the main class. If, for example, you do the following: |
002a359a |
489 | |
24d67825 |
490 | CD->might_have(liner_notes => 'LinerNotes', undef, { |
491 | proxy => [ qw/notes/ ], |
492 | }); |
002a359a |
493 | |
24d67825 |
494 | Then, assuming LinerNotes has an accessor named notes, you can do: |
988bf309 |
495 | |
24d67825 |
496 | my $cd = CD->find(1); |
2053ab2a |
497 | # set notes -- LinerNotes object is created if it doesn't exist |
498 | $cd->notes('Notes go here'); |
988bf309 |
499 | |
500 | =item accessor |
501 | |
502 | Specifies the type of accessor that should be created for the |
75d07914 |
503 | relationship. Valid values are C<single> (for when there is only a single |
504 | related object), C<multi> (when there can be many), and C<filter> (for |
505 | when there is a single related object, but you also want the relationship |
506 | accessor to double as a column accessor). For C<multi> accessors, an |
507 | add_to_* method is also created, which calls C<create_related> for the |
988bf309 |
508 | relationship. |
509 | |
8452e496 |
510 | =back |
511 | |
512 | =cut |
513 | |
514 | sub add_relationship { |
515 | my ($self, $rel, $f_source_name, $cond, $attrs) = @_; |
27f01d1f |
516 | $self->throw_exception("Can't create relationship without join condition") |
517 | unless $cond; |
8452e496 |
518 | $attrs ||= {}; |
87772e46 |
519 | |
8452e496 |
520 | my %rels = %{ $self->_relationships }; |
521 | $rels{$rel} = { class => $f_source_name, |
87772e46 |
522 | source => $f_source_name, |
8452e496 |
523 | cond => $cond, |
524 | attrs => $attrs }; |
525 | $self->_relationships(\%rels); |
526 | |
30126ac7 |
527 | return $self; |
87772e46 |
528 | |
953a18ef |
529 | # XXX disabled. doesn't work properly currently. skip in tests. |
530 | |
8452e496 |
531 | my $f_source = $self->schema->source($f_source_name); |
532 | unless ($f_source) { |
c037c03a |
533 | $self->ensure_class_loaded($f_source_name); |
8452e496 |
534 | $f_source = $f_source_name->result_source; |
87772e46 |
535 | #my $s_class = ref($self->schema); |
536 | #$f_source_name =~ m/^${s_class}::(.*)$/; |
537 | #$self->schema->register_class(($1 || $f_source_name), $f_source_name); |
538 | #$f_source = $self->schema->source($f_source_name); |
8452e496 |
539 | } |
540 | return unless $f_source; # Can't test rel without f_source |
541 | |
542 | eval { $self->resolve_join($rel, 'me') }; |
543 | |
544 | if ($@) { # If the resolve failed, back out and re-throw the error |
75d07914 |
545 | delete $rels{$rel}; # |
8452e496 |
546 | $self->_relationships(\%rels); |
701da8c4 |
547 | $self->throw_exception("Error creating relationship $rel: $@"); |
8452e496 |
548 | } |
549 | 1; |
550 | } |
551 | |
87c4e602 |
552 | =head2 relationships |
8452e496 |
553 | |
2053ab2a |
554 | Returns all relationship names for this source. |
8452e496 |
555 | |
556 | =cut |
557 | |
558 | sub relationships { |
559 | return keys %{shift->_relationships}; |
560 | } |
561 | |
87c4e602 |
562 | =head2 relationship_info |
563 | |
27f01d1f |
564 | =over 4 |
565 | |
ebc77b53 |
566 | =item Arguments: $relname |
27f01d1f |
567 | |
568 | =back |
8452e496 |
569 | |
2053ab2a |
570 | Returns a hash of relationship information for the specified relationship |
571 | name. |
8452e496 |
572 | |
573 | =cut |
574 | |
575 | sub relationship_info { |
576 | my ($self, $rel) = @_; |
577 | return $self->_relationships->{$rel}; |
75d07914 |
578 | } |
8452e496 |
579 | |
87c4e602 |
580 | =head2 has_relationship |
581 | |
27f01d1f |
582 | =over 4 |
583 | |
ebc77b53 |
584 | =item Arguments: $rel |
27f01d1f |
585 | |
586 | =back |
953a18ef |
587 | |
2053ab2a |
588 | Returns true if the source has a relationship of this name, false otherwise. |
988bf309 |
589 | |
590 | =cut |
953a18ef |
591 | |
592 | sub has_relationship { |
593 | my ($self, $rel) = @_; |
594 | return exists $self->_relationships->{$rel}; |
595 | } |
596 | |
de60a93d |
597 | =head2 reverse_relationship_info |
598 | |
599 | =over 4 |
600 | |
601 | =item Arguments: $relname |
602 | |
603 | =back |
604 | |
bab77431 |
605 | Returns an array of hash references of relationship information for |
de60a93d |
606 | the other side of the specified relationship name. |
607 | |
608 | =cut |
609 | |
610 | sub reverse_relationship_info { |
611 | my ($self, $rel) = @_; |
612 | my $rel_info = $self->relationship_info($rel); |
613 | my $ret = {}; |
614 | |
615 | return $ret unless ((ref $rel_info->{cond}) eq 'HASH'); |
616 | |
617 | my @cond = keys(%{$rel_info->{cond}}); |
618 | my @refkeys = map {/^\w+\.(\w+)$/} @cond; |
619 | my @keys = map {$rel_info->{cond}->{$_} =~ /^\w+\.(\w+)$/} @cond; |
bab77431 |
620 | |
de60a93d |
621 | # Get the related result source for this relationship |
622 | my $othertable = $self->related_source($rel); |
623 | |
624 | # Get all the relationships for that source that related to this source |
625 | # whose foreign column set are our self columns on $rel and whose self |
bab77431 |
626 | # columns are our foreign columns on $rel. |
de60a93d |
627 | my @otherrels = $othertable->relationships(); |
628 | my $otherrelationship; |
629 | foreach my $otherrel (@otherrels) { |
630 | my $otherrel_info = $othertable->relationship_info($otherrel); |
631 | |
632 | my $back = $othertable->related_source($otherrel); |
633 | next unless $back->name eq $self->name; |
634 | |
635 | my @othertestconds; |
636 | |
637 | if (ref $otherrel_info->{cond} eq 'HASH') { |
638 | @othertestconds = ($otherrel_info->{cond}); |
639 | } |
640 | elsif (ref $otherrel_info->{cond} eq 'ARRAY') { |
641 | @othertestconds = @{$otherrel_info->{cond}}; |
642 | } |
643 | else { |
644 | next; |
645 | } |
646 | |
647 | foreach my $othercond (@othertestconds) { |
648 | my @other_cond = keys(%$othercond); |
649 | my @other_refkeys = map {/^\w+\.(\w+)$/} @other_cond; |
650 | my @other_keys = map {$othercond->{$_} =~ /^\w+\.(\w+)$/} @other_cond; |
bab77431 |
651 | next if (!$self->compare_relationship_keys(\@refkeys, \@other_keys) || |
de60a93d |
652 | !$self->compare_relationship_keys(\@other_refkeys, \@keys)); |
653 | $ret->{$otherrel} = $otherrel_info; |
654 | } |
655 | } |
656 | return $ret; |
657 | } |
658 | |
659 | =head2 compare_relationship_keys |
660 | |
661 | =over 4 |
662 | |
663 | =item Arguments: $keys1, $keys2 |
664 | |
665 | =back |
666 | |
667 | Returns true if both sets of keynames are the same, false otherwise. |
668 | |
669 | =cut |
670 | |
671 | sub compare_relationship_keys { |
672 | my ($self, $keys1, $keys2) = @_; |
673 | |
674 | # Make sure every keys1 is in keys2 |
675 | my $found; |
676 | foreach my $key (@$keys1) { |
677 | $found = 0; |
678 | foreach my $prim (@$keys2) { |
679 | if ($prim eq $key) { |
680 | $found = 1; |
681 | last; |
682 | } |
683 | } |
684 | last unless $found; |
685 | } |
686 | |
687 | # Make sure every key2 is in key1 |
688 | if ($found) { |
689 | foreach my $prim (@$keys2) { |
690 | $found = 0; |
691 | foreach my $key (@$keys1) { |
692 | if ($prim eq $key) { |
693 | $found = 1; |
694 | last; |
695 | } |
696 | } |
697 | last unless $found; |
698 | } |
699 | } |
700 | |
701 | return $found; |
702 | } |
703 | |
87c4e602 |
704 | =head2 resolve_join |
705 | |
27f01d1f |
706 | =over 4 |
707 | |
ebc77b53 |
708 | =item Arguments: $relation |
27f01d1f |
709 | |
710 | =back |
8452e496 |
711 | |
2053ab2a |
712 | Returns the join structure required for the related result source. |
8452e496 |
713 | |
714 | =cut |
715 | |
716 | sub resolve_join { |
489709af |
717 | my ($self, $join, $alias, $seen) = @_; |
718 | $seen ||= {}; |
87772e46 |
719 | if (ref $join eq 'ARRAY') { |
489709af |
720 | return map { $self->resolve_join($_, $alias, $seen) } @$join; |
87772e46 |
721 | } elsif (ref $join eq 'HASH') { |
489709af |
722 | return |
887ce227 |
723 | map { |
724 | my $as = ($seen->{$_} ? $_.'_'.($seen->{$_}+1) : $_); |
725 | ($self->resolve_join($_, $alias, $seen), |
726 | $self->related_source($_)->resolve_join($join->{$_}, $as, $seen)); |
727 | } keys %$join; |
87772e46 |
728 | } elsif (ref $join) { |
701da8c4 |
729 | $self->throw_exception("No idea how to resolve join reftype ".ref $join); |
87772e46 |
730 | } else { |
489709af |
731 | my $count = ++$seen->{$join}; |
732 | #use Data::Dumper; warn Dumper($seen); |
733 | my $as = ($count > 1 ? "${join}_${count}" : $join); |
3842b955 |
734 | my $rel_info = $self->relationship_info($join); |
701da8c4 |
735 | $self->throw_exception("No such relationship ${join}") unless $rel_info; |
3842b955 |
736 | my $type = $rel_info->{attrs}{join_type} || ''; |
489709af |
737 | return [ { $as => $self->related_source($join)->from, |
953a18ef |
738 | -join_type => $type }, |
489709af |
739 | $self->resolve_condition($rel_info->{cond}, $as, $alias) ]; |
953a18ef |
740 | } |
741 | } |
742 | |
87c4e602 |
743 | =head2 resolve_condition |
744 | |
27f01d1f |
745 | =over 4 |
746 | |
ebc77b53 |
747 | =item Arguments: $cond, $as, $alias|$object |
27f01d1f |
748 | |
749 | =back |
953a18ef |
750 | |
3842b955 |
751 | Resolves the passed condition to a concrete query fragment. If given an alias, |
953a18ef |
752 | returns a join condition; if given an object, inverts that object to produce |
753 | a related conditional from that object. |
754 | |
755 | =cut |
756 | |
757 | sub resolve_condition { |
489709af |
758 | my ($self, $cond, $as, $for) = @_; |
953a18ef |
759 | #warn %$cond; |
760 | if (ref $cond eq 'HASH') { |
761 | my %ret; |
bd054cb4 |
762 | foreach my $k (keys %{$cond}) { |
763 | my $v = $cond->{$k}; |
953a18ef |
764 | # XXX should probably check these are valid columns |
27f01d1f |
765 | $k =~ s/^foreign\.// || |
75d07914 |
766 | $self->throw_exception("Invalid rel cond key ${k}"); |
27f01d1f |
767 | $v =~ s/^self\.// || |
75d07914 |
768 | $self->throw_exception("Invalid rel cond val ${v}"); |
953a18ef |
769 | if (ref $for) { # Object |
3842b955 |
770 | #warn "$self $k $for $v"; |
771 | $ret{$k} = $for->get_column($v); |
772 | #warn %ret; |
2c037e6b |
773 | } elsif (!defined $for) { # undef, i.e. "no object" |
774 | $ret{$k} = undef; |
fde6e28e |
775 | } elsif (ref $as) { # reverse object |
776 | $ret{$v} = $as->get_column($k); |
2c037e6b |
777 | } elsif (!defined $as) { # undef, i.e. "no reverse object" |
778 | $ret{$v} = undef; |
953a18ef |
779 | } else { |
489709af |
780 | $ret{"${as}.${k}"} = "${for}.${v}"; |
953a18ef |
781 | } |
953a18ef |
782 | } |
783 | return \%ret; |
5efe4c79 |
784 | } elsif (ref $cond eq 'ARRAY') { |
489709af |
785 | return [ map { $self->resolve_condition($_, $as, $for) } @$cond ]; |
953a18ef |
786 | } else { |
787 | die("Can't handle this yet :("); |
87772e46 |
788 | } |
789 | } |
790 | |
87c4e602 |
791 | =head2 resolve_prefetch |
792 | |
27f01d1f |
793 | =over 4 |
794 | |
ebc77b53 |
795 | =item Arguments: hashref/arrayref/scalar |
27f01d1f |
796 | |
797 | =back |
988bf309 |
798 | |
b3e8ac9b |
799 | Accepts one or more relationships for the current source and returns an |
800 | array of column names for each of those relationships. Column names are |
801 | prefixed relative to the current source, in accordance with where they appear |
802 | in the supplied relationships. Examples: |
803 | |
5ac6a044 |
804 | my $source = $schema->resultset('Tag')->source; |
b3e8ac9b |
805 | @columns = $source->resolve_prefetch( { cd => 'artist' } ); |
806 | |
807 | # @columns = |
808 | #( |
809 | # 'cd.cdid', |
810 | # 'cd.artist', |
811 | # 'cd.title', |
812 | # 'cd.year', |
813 | # 'cd.artist.artistid', |
814 | # 'cd.artist.name' |
815 | #) |
816 | |
817 | @columns = $source->resolve_prefetch( qw[/ cd /] ); |
818 | |
819 | # @columns = |
820 | #( |
821 | # 'cd.cdid', |
822 | # 'cd.artist', |
823 | # 'cd.title', |
824 | # 'cd.year' |
825 | #) |
826 | |
827 | $source = $schema->resultset('CD')->source; |
828 | @columns = $source->resolve_prefetch( qw[/ artist producer /] ); |
829 | |
830 | # @columns = |
831 | #( |
832 | # 'artist.artistid', |
833 | # 'artist.name', |
834 | # 'producer.producerid', |
835 | # 'producer.name' |
75d07914 |
836 | #) |
988bf309 |
837 | |
b3e8ac9b |
838 | =cut |
839 | |
840 | sub resolve_prefetch { |
0f66a01b |
841 | my ($self, $pre, $alias, $seen, $order, $collapse) = @_; |
489709af |
842 | $seen ||= {}; |
b3e8ac9b |
843 | #$alias ||= $self->name; |
844 | #warn $alias, Dumper $pre; |
845 | if( ref $pre eq 'ARRAY' ) { |
0f66a01b |
846 | return |
847 | map { $self->resolve_prefetch( $_, $alias, $seen, $order, $collapse ) } |
848 | @$pre; |
b3e8ac9b |
849 | } |
850 | elsif( ref $pre eq 'HASH' ) { |
851 | my @ret = |
852 | map { |
0f66a01b |
853 | $self->resolve_prefetch($_, $alias, $seen, $order, $collapse), |
489709af |
854 | $self->related_source($_)->resolve_prefetch( |
0f66a01b |
855 | $pre->{$_}, "${alias}.$_", $seen, $order, $collapse) |
856 | } keys %$pre; |
b3e8ac9b |
857 | #die Dumper \@ret; |
858 | return @ret; |
859 | } |
860 | elsif( ref $pre ) { |
a86b1efe |
861 | $self->throw_exception( |
862 | "don't know how to resolve prefetch reftype ".ref($pre)); |
b3e8ac9b |
863 | } |
864 | else { |
489709af |
865 | my $count = ++$seen->{$pre}; |
866 | my $as = ($count > 1 ? "${pre}_${count}" : $pre); |
b3e8ac9b |
867 | my $rel_info = $self->relationship_info( $pre ); |
a86b1efe |
868 | $self->throw_exception( $self->name . " has no such relationship '$pre'" ) |
869 | unless $rel_info; |
37f23589 |
870 | my $as_prefix = ($alias =~ /^.*?\.(.+)$/ ? $1.'.' : ''); |
a86b1efe |
871 | my $rel_source = $self->related_source($pre); |
0f66a01b |
872 | |
873 | if (exists $rel_info->{attrs}{accessor} |
874 | && $rel_info->{attrs}{accessor} eq 'multi') { |
875 | $self->throw_exception( |
876 | "Can't prefetch has_many ${pre} (join cond too complex)") |
877 | unless ref($rel_info->{cond}) eq 'HASH'; |
37f23589 |
878 | my @key = map { (/^foreign\.(.+)$/ ? ($1) : ()); } |
0f66a01b |
879 | keys %{$rel_info->{cond}}; |
880 | $collapse->{"${as_prefix}${pre}"} = \@key; |
5a5bec6c |
881 | my @ord = (ref($rel_info->{attrs}{order_by}) eq 'ARRAY' |
882 | ? @{$rel_info->{attrs}{order_by}} |
883 | : (defined $rel_info->{attrs}{order_by} |
884 | ? ($rel_info->{attrs}{order_by}) |
885 | : ())); |
886 | push(@$order, map { "${as}.$_" } (@key, @ord)); |
0f66a01b |
887 | } |
888 | |
489709af |
889 | return map { [ "${as}.$_", "${as_prefix}${pre}.$_", ] } |
a86b1efe |
890 | $rel_source->columns; |
b3e8ac9b |
891 | #warn $alias, Dumper (\@ret); |
489709af |
892 | #return @ret; |
b3e8ac9b |
893 | } |
894 | } |
953a18ef |
895 | |
87c4e602 |
896 | =head2 related_source |
897 | |
27f01d1f |
898 | =over 4 |
899 | |
ebc77b53 |
900 | =item Arguments: $relname |
27f01d1f |
901 | |
902 | =back |
87772e46 |
903 | |
2053ab2a |
904 | Returns the result source object for the given relationship. |
87772e46 |
905 | |
906 | =cut |
907 | |
908 | sub related_source { |
909 | my ($self, $rel) = @_; |
aea52c85 |
910 | if( !$self->has_relationship( $rel ) ) { |
701da8c4 |
911 | $self->throw_exception("No such relationship '$rel'"); |
aea52c85 |
912 | } |
87772e46 |
913 | return $self->schema->source($self->relationship_info($rel)->{source}); |
8452e496 |
914 | } |
915 | |
77254782 |
916 | =head2 related_class |
917 | |
27f01d1f |
918 | =over 4 |
919 | |
ebc77b53 |
920 | =item Arguments: $relname |
27f01d1f |
921 | |
922 | =back |
77254782 |
923 | |
2053ab2a |
924 | Returns the class name for objects in the given relationship. |
77254782 |
925 | |
926 | =cut |
927 | |
928 | sub related_class { |
929 | my ($self, $rel) = @_; |
930 | if( !$self->has_relationship( $rel ) ) { |
931 | $self->throw_exception("No such relationship '$rel'"); |
932 | } |
933 | return $self->schema->class($self->relationship_info($rel)->{source}); |
934 | } |
935 | |
5ac6a044 |
936 | =head2 resultset |
937 | |
bcc5a210 |
938 | Returns a resultset for the given source. This will initially be created |
939 | on demand by calling |
5ac6a044 |
940 | |
988bf309 |
941 | $self->resultset_class->new($self, $self->resultset_attributes) |
5ac6a044 |
942 | |
bcc5a210 |
943 | but is cached from then on unless resultset_class changes. |
944 | |
5ac6a044 |
945 | =head2 resultset_class |
946 | |
d7be2784 |
947 | ` package My::ResultSetClass; |
948 | use base 'DBIx::Class::ResultSet'; |
949 | ... |
950 | |
951 | $source->resultset_class('My::ResultSet::Class'); |
952 | |
988bf309 |
953 | Set the class of the resultset, this is useful if you want to create your |
954 | own resultset methods. Create your own class derived from |
d7be2784 |
955 | L<DBIx::Class::ResultSet>, and set it here. |
5ac6a044 |
956 | |
957 | =head2 resultset_attributes |
958 | |
d7be2784 |
959 | $source->resultset_attributes({ order_by => [ 'id' ] }); |
960 | |
988bf309 |
961 | Specify here any attributes you wish to pass to your specialised resultset. |
5ac6a044 |
962 | |
963 | =cut |
964 | |
965 | sub resultset { |
966 | my $self = shift; |
27f01d1f |
967 | $self->throw_exception( |
968 | 'resultset does not take any arguments. If you want another resultset, '. |
969 | 'call it on the schema instead.' |
970 | ) if scalar @_; |
428c2b82 |
971 | |
972 | # disabled until we can figure out a way to do it without consistency issues |
973 | # |
974 | #return $self->{_resultset} |
975 | # if ref $self->{_resultset} eq $self->resultset_class; |
976 | #return $self->{_resultset} = |
977 | |
978 | return $self->resultset_class->new( |
27f01d1f |
979 | $self, $self->{resultset_attributes} |
980 | ); |
5ac6a044 |
981 | } |
982 | |
bab77431 |
983 | =head2 source_name |
984 | |
985 | =over 4 |
986 | |
987 | =item Arguments: $source_name |
988 | |
989 | =back |
990 | |
991 | Set the name of the result source when it is loaded into a schema. |
992 | This is usefull if you want to refer to a result source by a name other than |
993 | its class name. |
994 | |
995 | package ArchivedBooks; |
996 | use base qw/DBIx::Class/; |
997 | __PACKAGE__->table('books_archive'); |
998 | __PACKAGE__->source_name('Books'); |
999 | |
1000 | # from your schema... |
1001 | $schema->resultset('Books')->find(1); |
1002 | |
aec3eff1 |
1003 | =head2 handle |
1004 | |
1005 | Obtain a new handle to this source. Returns an instance of a |
1006 | L<DBIx::Class::ResultSourceHandle>. |
1007 | |
1008 | =cut |
1009 | |
1010 | sub handle { |
1011 | return new DBIx::Class::ResultSourceHandle({ |
1012 | schema => $_[0]->schema, |
1013 | source_monkier => $_[0]->source_name |
1014 | }); |
1015 | } |
1016 | |
701da8c4 |
1017 | =head2 throw_exception |
1018 | |
2053ab2a |
1019 | See L<DBIx::Class::Schema/"throw_exception">. |
701da8c4 |
1020 | |
1021 | =cut |
1022 | |
1023 | sub throw_exception { |
1024 | my $self = shift; |
75d07914 |
1025 | if (defined $self->schema) { |
701da8c4 |
1026 | $self->schema->throw_exception(@_); |
1027 | } else { |
1028 | croak(@_); |
1029 | } |
1030 | } |
1031 | |
9c992ba1 |
1032 | =head1 AUTHORS |
1033 | |
1034 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
1035 | |
1036 | =head1 LICENSE |
1037 | |
1038 | You may distribute this code under the same terms as Perl itself. |
1039 | |
1040 | =cut |
1041 | |