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 |
acbe81cf |
15 | schema from _relationships column_info_from_storage source_info |
f89bb832 |
16 | source_name sqlt_deploy_callback/); |
aa1088bf |
17 | |
fac560c2 |
18 | __PACKAGE__->mk_group_accessors('component_class' => 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 | |
00be2e0b |
32 | Basic view support also exists, see L<<DBIx::Class::ResultSource::View>. |
33 | |
9c992ba1 |
34 | =head1 METHODS |
35 | |
7eb4ecc8 |
36 | =pod |
37 | |
9c992ba1 |
38 | =cut |
39 | |
40 | sub new { |
41 | my ($class, $attrs) = @_; |
42 | $class = ref $class if ref $class; |
04786a4c |
43 | |
6b051e14 |
44 | my $new = bless { %{$attrs || {}} }, $class; |
9c992ba1 |
45 | $new->{resultset_class} ||= 'DBIx::Class::ResultSet'; |
5ac6a044 |
46 | $new->{resultset_attributes} = { %{$new->{resultset_attributes} || {}} }; |
6da5894c |
47 | $new->{_ordered_columns} = [ @{$new->{_ordered_columns}||[]}]; |
48 | $new->{_columns} = { %{$new->{_columns}||{}} }; |
49 | $new->{_relationships} = { %{$new->{_relationships}||{}} }; |
9c992ba1 |
50 | $new->{name} ||= "!!NAME NOT SET!!"; |
5afa2a15 |
51 | $new->{_columns_info_loaded} ||= 0; |
f89bb832 |
52 | $new->{sqlt_deploy_callback} ||= "default_sqlt_deploy_hook"; |
9c992ba1 |
53 | return $new; |
54 | } |
55 | |
988bf309 |
56 | =pod |
57 | |
5ac6a044 |
58 | =head2 add_columns |
59 | |
391ccf38 |
60 | =over |
61 | |
62 | =item Arguments: @columns |
63 | |
64 | =item Return value: The ResultSource object |
65 | |
66 | =back |
67 | |
843f6bc1 |
68 | $source->add_columns(qw/col1 col2 col3/); |
5ac6a044 |
69 | |
843f6bc1 |
70 | $source->add_columns('col1' => \%col1_info, 'col2' => \%col2_info, ...); |
5ac6a044 |
71 | |
2053ab2a |
72 | Adds columns to the result source. If supplied key => hashref pairs, uses |
73 | the hashref as the column_info for that column. Repeated calls of this |
74 | method will add more columns, not replace them. |
5ac6a044 |
75 | |
5d9d9e87 |
76 | The column names given will be created as accessor methods on your |
7e51afbf |
77 | L<DBIx::Class::Row> objects. You can change the name of the accessor |
5d9d9e87 |
78 | by supplying an L</accessor> in the column_info hash. |
79 | |
2053ab2a |
80 | The contents of the column_info are not set in stone. The following |
81 | keys are currently recognised/used by DBIx::Class: |
988bf309 |
82 | |
83 | =over 4 |
84 | |
75d07914 |
85 | =item accessor |
988bf309 |
86 | |
5d9d9e87 |
87 | Use this to set the name of the accessor method for this column. If unset, |
988bf309 |
88 | the name of the column will be used. |
89 | |
90 | =item data_type |
91 | |
2053ab2a |
92 | This contains the column type. It is automatically filled by the |
988bf309 |
93 | L<SQL::Translator::Producer::DBIx::Class::File> producer, and the |
2053ab2a |
94 | L<DBIx::Class::Schema::Loader> module. If you do not enter a |
988bf309 |
95 | data_type, DBIx::Class will attempt to retrieve it from the |
2053ab2a |
96 | database for you, using L<DBI>'s column_info method. The values of this |
988bf309 |
97 | key are typically upper-cased. |
98 | |
2053ab2a |
99 | Currently there is no standard set of values for the data_type. Use |
100 | whatever your database supports. |
988bf309 |
101 | |
102 | =item size |
103 | |
104 | The length of your column, if it is a column type that can have a size |
d7be2784 |
105 | restriction. This is currently only used by L<DBIx::Class::Schema/deploy>. |
988bf309 |
106 | |
107 | =item is_nullable |
108 | |
2053ab2a |
109 | Set this to a true value for a columns that is allowed to contain |
d7be2784 |
110 | NULL values. This is currently only used by L<DBIx::Class::Schema/deploy>. |
988bf309 |
111 | |
112 | =item is_auto_increment |
113 | |
2053ab2a |
114 | Set this to a true value for a column whose value is somehow |
115 | automatically set. This is used to determine which columns to empty |
d7be2784 |
116 | when cloning objects using C<copy>. It is also used by |
117 | L<DBIx::Class::Schema/deploy>. |
988bf309 |
118 | |
119 | =item is_foreign_key |
120 | |
2053ab2a |
121 | Set this to a true value for a column that contains a key from a |
d7be2784 |
122 | foreign table. This is currently only used by |
123 | L<DBIx::Class::Schema/deploy>. |
988bf309 |
124 | |
125 | =item default_value |
126 | |
2053ab2a |
127 | Set this to the default value which will be inserted into a column |
128 | by the database. Can contain either a value or a function. This is |
d7be2784 |
129 | currently only used by L<DBIx::Class::Schema/deploy>. |
988bf309 |
130 | |
131 | =item sequence |
132 | |
2053ab2a |
133 | Set this on a primary key column to the name of the sequence used to |
134 | generate a new key value. If not specified, L<DBIx::Class::PK::Auto> |
135 | will attempt to retrieve the name of the sequence from the database |
136 | automatically. |
988bf309 |
137 | |
838ef78d |
138 | =item auto_nextval |
139 | |
140 | Set this to a true value for a column whose value is retrieved |
7e51afbf |
141 | automatically from an oracle sequence. If you do not use an Oracle |
838ef78d |
142 | trigger to get the nextval, you have to set sequence as well. |
143 | |
190615a7 |
144 | =item extra |
d7be2784 |
145 | |
146 | This is used by L<DBIx::Class::Schema/deploy> and L<SQL::Translator> |
190615a7 |
147 | to add extra non-generic data to the column. For example: C<< extra |
d7be2784 |
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 | |
391ccf38 |
156 | =over |
157 | |
158 | =item Arguments: $colname, [ \%columninfo ] |
159 | |
160 | =item Return value: 1/0 (true/false) |
161 | |
162 | =back |
163 | |
843f6bc1 |
164 | $source->add_column('col' => \%info?); |
5ac6a044 |
165 | |
391ccf38 |
166 | Add a single column and optional column info. Uses the same column |
167 | info keys as L</add_columns>. |
5ac6a044 |
168 | |
169 | =cut |
170 | |
9c992ba1 |
171 | sub add_columns { |
172 | my ($self, @cols) = @_; |
8e04bf91 |
173 | $self->_ordered_columns(\@cols) unless $self->_ordered_columns; |
002a359a |
174 | |
20518cb4 |
175 | my @added; |
176 | my $columns = $self->_columns; |
9c992ba1 |
177 | while (my $col = shift @cols) { |
8e04bf91 |
178 | # If next entry is { ... } use that for the column info, if not |
179 | # use an empty hashref |
30126ac7 |
180 | my $column_info = ref $cols[0] ? shift(@cols) : {}; |
20518cb4 |
181 | push(@added, $col) unless exists $columns->{$col}; |
20518cb4 |
182 | $columns->{$col} = $column_info; |
9c992ba1 |
183 | } |
20518cb4 |
184 | push @{ $self->_ordered_columns }, @added; |
30126ac7 |
185 | return $self; |
9c992ba1 |
186 | } |
187 | |
b25e9fa0 |
188 | sub add_column { shift->add_columns(@_); } # DO NOT CHANGE THIS TO GLOB |
9c992ba1 |
189 | |
3842b955 |
190 | =head2 has_column |
191 | |
391ccf38 |
192 | =over |
193 | |
194 | =item Arguments: $colname |
195 | |
196 | =item Return value: 1/0 (true/false) |
197 | |
198 | =back |
199 | |
843f6bc1 |
200 | if ($source->has_column($colname)) { ... } |
988bf309 |
201 | |
2053ab2a |
202 | Returns true if the source has a column of this name, false otherwise. |
988bf309 |
203 | |
204 | =cut |
9c992ba1 |
205 | |
206 | sub has_column { |
207 | my ($self, $column) = @_; |
208 | return exists $self->_columns->{$column}; |
209 | } |
210 | |
87c4e602 |
211 | =head2 column_info |
9c992ba1 |
212 | |
391ccf38 |
213 | =over |
214 | |
215 | =item Arguments: $colname |
216 | |
217 | =item Return value: Hashref of info |
218 | |
219 | =back |
220 | |
843f6bc1 |
221 | my $info = $source->column_info($col); |
9c992ba1 |
222 | |
391ccf38 |
223 | Returns the column metadata hashref for a column, as originally passed |
224 | to L</add_columns>. See the description of L</add_columns> for information |
225 | on the contents of the hashref. |
9c992ba1 |
226 | |
988bf309 |
227 | =cut |
9c992ba1 |
228 | |
229 | sub column_info { |
230 | my ($self, $column) = @_; |
75d07914 |
231 | $self->throw_exception("No such column $column") |
701da8c4 |
232 | unless exists $self->_columns->{$column}; |
5afa2a15 |
233 | #warn $self->{_columns_info_loaded}, "\n"; |
75d07914 |
234 | if ( ! $self->_columns->{$column}{data_type} |
6eda9bcf |
235 | and $self->column_info_from_storage |
75d07914 |
236 | and ! $self->{_columns_info_loaded} |
8e04bf91 |
237 | and $self->schema and $self->storage ) |
238 | { |
239 | $self->{_columns_info_loaded}++; |
d51f93c8 |
240 | my $info = {}; |
241 | my $lc_info = {}; |
75d07914 |
242 | # eval for the case of storage without table |
955f1590 |
243 | eval { $info = $self->storage->columns_info_for( $self->from ) }; |
8e04bf91 |
244 | unless ($@) { |
0b88a5bb |
245 | for my $realcol ( keys %{$info} ) { |
246 | $lc_info->{lc $realcol} = $info->{$realcol}; |
247 | } |
8e04bf91 |
248 | foreach my $col ( keys %{$self->_columns} ) { |
d51f93c8 |
249 | $self->_columns->{$col} = { |
250 | %{ $self->_columns->{$col} }, |
251 | %{ $info->{$col} || $lc_info->{lc $col} || {} } |
252 | }; |
a953d8d9 |
253 | } |
8e04bf91 |
254 | } |
a953d8d9 |
255 | } |
9c992ba1 |
256 | return $self->_columns->{$column}; |
257 | } |
258 | |
259 | =head2 columns |
260 | |
391ccf38 |
261 | =over |
262 | |
263 | =item Arguments: None |
264 | |
265 | =item Return value: Ordered list of column names |
266 | |
267 | =back |
268 | |
269 | my @column_names = $source->columns; |
20518cb4 |
270 | |
391ccf38 |
271 | Returns all column names in the order they were declared to L</add_columns>. |
87f0da6a |
272 | |
273 | =cut |
9c992ba1 |
274 | |
275 | sub columns { |
8e04bf91 |
276 | my $self = shift; |
aa1088bf |
277 | $self->throw_exception( |
278 | "columns() is a read-only accessor, did you mean add_columns()?" |
279 | ) if (@_ > 1); |
701da8c4 |
280 | return @{$self->{_ordered_columns}||[]}; |
571dced3 |
281 | } |
282 | |
002a359a |
283 | =head2 remove_columns |
284 | |
391ccf38 |
285 | =over |
002a359a |
286 | |
391ccf38 |
287 | =item Arguments: @colnames |
288 | |
289 | =item Return value: undefined |
290 | |
291 | =back |
292 | |
293 | $source->remove_columns(qw/col1 col2 col3/); |
294 | |
295 | Removes the given list of columns by name, from the result source. |
296 | |
297 | B<Warning>: Removing a column that is also used in the sources primary |
298 | key, or in one of the sources unique constraints, B<will> result in a |
299 | broken result source. |
002a359a |
300 | |
301 | =head2 remove_column |
302 | |
391ccf38 |
303 | =over |
304 | |
305 | =item Arguments: $colname |
306 | |
307 | =item Return value: undefined |
308 | |
309 | =back |
002a359a |
310 | |
391ccf38 |
311 | $source->remove_column('col'); |
312 | |
313 | Remove a single column by name from the result source, similar to |
314 | L</remove_columns>. |
315 | |
316 | B<Warning>: Removing a column that is also used in the sources primary |
317 | key, or in one of the sources unique constraints, B<will> result in a |
318 | broken result source. |
002a359a |
319 | |
320 | =cut |
321 | |
322 | sub remove_columns { |
4738027b |
323 | my ($self, @to_remove) = @_; |
002a359a |
324 | |
4738027b |
325 | my $columns = $self->_columns |
326 | or return; |
002a359a |
327 | |
4738027b |
328 | my %to_remove; |
329 | for (@to_remove) { |
a918d901 |
330 | delete $columns->{$_}; |
4738027b |
331 | ++$to_remove{$_}; |
332 | } |
002a359a |
333 | |
4738027b |
334 | $self->_ordered_columns([ grep { not $to_remove{$_} } @{$self->_ordered_columns} ]); |
002a359a |
335 | } |
336 | |
b25e9fa0 |
337 | sub remove_column { shift->remove_columns(@_); } # DO NOT CHANGE THIS TO GLOB |
002a359a |
338 | |
87c4e602 |
339 | =head2 set_primary_key |
340 | |
27f01d1f |
341 | =over 4 |
342 | |
ebc77b53 |
343 | =item Arguments: @cols |
27f01d1f |
344 | |
391ccf38 |
345 | =item Return value: undefined |
346 | |
27f01d1f |
347 | =back |
87f0da6a |
348 | |
9c992ba1 |
349 | Defines one or more columns as primary key for this source. Should be |
391ccf38 |
350 | called after L</add_columns>. |
87f0da6a |
351 | |
391ccf38 |
352 | Additionally, defines a L<unique constraint|add_unique_constraint> |
353 | named C<primary>. |
87f0da6a |
354 | |
988bf309 |
355 | The primary key columns are used by L<DBIx::Class::PK::Auto> to |
75d07914 |
356 | retrieve automatically created values from the database. |
988bf309 |
357 | |
87f0da6a |
358 | =cut |
9c992ba1 |
359 | |
360 | sub set_primary_key { |
361 | my ($self, @cols) = @_; |
362 | # check if primary key columns are valid columns |
8e04bf91 |
363 | foreach my $col (@cols) { |
364 | $self->throw_exception("No such column $col on table " . $self->name) |
365 | unless $self->has_column($col); |
9c992ba1 |
366 | } |
367 | $self->_primaries(\@cols); |
87f0da6a |
368 | |
369 | $self->add_unique_constraint(primary => \@cols); |
9c992ba1 |
370 | } |
371 | |
87f0da6a |
372 | =head2 primary_columns |
373 | |
391ccf38 |
374 | =over 4 |
375 | |
376 | =item Arguments: None |
377 | |
378 | =item Return value: Ordered list of primary column names |
379 | |
380 | =back |
381 | |
382 | Read-only accessor which returns the list of primary keys, supplied by |
383 | L</set_primary_key>. |
30126ac7 |
384 | |
87f0da6a |
385 | =cut |
9c992ba1 |
386 | |
387 | sub primary_columns { |
388 | return @{shift->_primaries||[]}; |
389 | } |
390 | |
87f0da6a |
391 | =head2 add_unique_constraint |
392 | |
391ccf38 |
393 | =over 4 |
394 | |
395 | =item Arguments: [ $name ], \@colnames |
396 | |
397 | =item Return value: undefined |
398 | |
399 | =back |
400 | |
87f0da6a |
401 | Declare a unique constraint on this source. Call once for each unique |
58b5bb8c |
402 | constraint. |
27f01d1f |
403 | |
404 | # For UNIQUE (column1, column2) |
405 | __PACKAGE__->add_unique_constraint( |
406 | constraint_name => [ qw/column1 column2/ ], |
407 | ); |
87f0da6a |
408 | |
368a5228 |
409 | Alternatively, you can specify only the columns: |
410 | |
411 | __PACKAGE__->add_unique_constraint([ qw/column1 column2/ ]); |
412 | |
413 | This will result in a unique constraint named C<table_column1_column2>, where |
414 | C<table> is replaced with the table name. |
415 | |
58b5bb8c |
416 | Unique constraints are used, for example, when you call |
417 | L<DBIx::Class::ResultSet/find>. Only columns in the constraint are searched. |
418 | |
391ccf38 |
419 | Throws an error if any of the given column names do not yet exist on |
420 | the result source. |
421 | |
87f0da6a |
422 | =cut |
423 | |
424 | sub add_unique_constraint { |
368a5228 |
425 | my $self = shift; |
426 | my $cols = pop @_; |
427 | my $name = shift; |
428 | |
429 | $name ||= $self->name_unique_constraint($cols); |
87f0da6a |
430 | |
8e04bf91 |
431 | foreach my $col (@$cols) { |
432 | $self->throw_exception("No such column $col on table " . $self->name) |
433 | unless $self->has_column($col); |
87f0da6a |
434 | } |
435 | |
436 | my %unique_constraints = $self->unique_constraints; |
437 | $unique_constraints{$name} = $cols; |
438 | $self->_unique_constraints(\%unique_constraints); |
439 | } |
440 | |
d9c74322 |
441 | =head2 name_unique_constraint |
368a5228 |
442 | |
391ccf38 |
443 | =over 4 |
444 | |
445 | =item Arguments: @colnames |
446 | |
447 | =item Return value: Constraint name |
448 | |
449 | =back |
450 | |
451 | $source->table('mytable'); |
452 | $source->name_unique_constraint('col1', 'col2'); |
453 | # returns |
454 | 'mytable_col1_col2' |
455 | |
456 | Return a name for a unique constraint containing the specified |
457 | columns. The name is created by joining the table name and each column |
458 | name, using an underscore character. |
368a5228 |
459 | |
460 | For example, a constraint on a table named C<cd> containing the columns |
461 | C<artist> and C<title> would result in a constraint name of C<cd_artist_title>. |
462 | |
391ccf38 |
463 | This is used by L</add_unique_constraint> if you do not specify the |
464 | optional constraint name. |
465 | |
368a5228 |
466 | =cut |
467 | |
468 | sub name_unique_constraint { |
469 | my ($self, $cols) = @_; |
470 | |
471 | return join '_', $self->name, @$cols; |
472 | } |
473 | |
87f0da6a |
474 | =head2 unique_constraints |
475 | |
391ccf38 |
476 | =over 4 |
477 | |
478 | =item Arguments: None |
479 | |
480 | =item Return value: Hash of unique constraint data |
481 | |
482 | =back |
483 | |
484 | $source->unique_constraints(); |
485 | |
486 | Read-only accessor which returns a hash of unique constraints on this source. |
487 | |
488 | The hash is keyed by constraint name, and contains an arrayref of |
489 | column names as values. |
87f0da6a |
490 | |
491 | =cut |
492 | |
493 | sub unique_constraints { |
494 | return %{shift->_unique_constraints||{}}; |
495 | } |
496 | |
e6a0e17c |
497 | =head2 unique_constraint_names |
498 | |
391ccf38 |
499 | =over 4 |
500 | |
501 | =item Arguments: None |
502 | |
503 | =item Return value: Unique constraint names |
504 | |
505 | =back |
506 | |
507 | $source->unique_constraint_names(); |
508 | |
e6a0e17c |
509 | Returns the list of unique constraint names defined on this source. |
510 | |
511 | =cut |
512 | |
513 | sub unique_constraint_names { |
514 | my ($self) = @_; |
515 | |
516 | my %unique_constraints = $self->unique_constraints; |
517 | |
518 | return keys %unique_constraints; |
519 | } |
520 | |
521 | =head2 unique_constraint_columns |
522 | |
391ccf38 |
523 | =over 4 |
524 | |
525 | =item Arguments: $constraintname |
526 | |
527 | =item Return value: List of constraint columns |
528 | |
529 | =back |
530 | |
531 | $source->unique_constraint_columns('myconstraint'); |
532 | |
e6a0e17c |
533 | Returns the list of columns that make up the specified unique constraint. |
534 | |
535 | =cut |
536 | |
537 | sub unique_constraint_columns { |
538 | my ($self, $constraint_name) = @_; |
539 | |
540 | my %unique_constraints = $self->unique_constraints; |
541 | |
542 | $self->throw_exception( |
543 | "Unknown unique constraint $constraint_name on '" . $self->name . "'" |
544 | ) unless exists $unique_constraints{$constraint_name}; |
545 | |
546 | return @{ $unique_constraints{$constraint_name} }; |
547 | } |
548 | |
880c075b |
549 | =head2 sqlt_deploy_callback |
550 | |
551 | =over |
552 | |
553 | =item Arguments: $callback |
554 | |
555 | =back |
556 | |
557 | __PACKAGE__->sqlt_deploy_callback('mycallbackmethod'); |
558 | |
559 | An accessor to set a callback to be called during deployment of |
560 | the schema via L<DBIx::Class::Schema/create_ddl_dir> or |
561 | L<DBIx::Class::Schema/deploy>. |
562 | |
563 | The callback can be set as either a code reference or the name of a |
564 | method in the current result class. |
565 | |
566 | If not set, the L</default_sqlt_deploy_hook> is called. |
567 | |
568 | Your callback will be passed the $source object representing the |
569 | ResultSource instance being deployed, and the |
570 | L<SQL::Translator::Schema::Table> object being created from it. The |
571 | callback can be used to manipulate the table object or add your own |
572 | customised indexes. If you need to manipulate a non-table object, use |
573 | the L<DBIx::Class::Schema/sqlt_deploy_hook>. |
574 | |
575 | See L<DBIx::Class::Manual::Cookbook/Adding Indexes And Functions To |
576 | Your SQL> for examples. |
577 | |
578 | This sqlt deployment callback can only be used to manipulate |
579 | SQL::Translator objects as they get turned into SQL. To execute |
580 | post-deploy statements which SQL::Translator does not currently |
581 | handle, override L<DBIx::Class::Schema/deploy> in your Schema class |
582 | and call L<dbh_do|DBIx::Class::Storage::DBI/dbh_do>. |
583 | |
584 | =head2 default_sqlt_deploy_hook |
585 | |
586 | =over |
587 | |
588 | =item Arguments: $source, $sqlt_table |
589 | |
590 | =item Return value: undefined |
591 | |
592 | =back |
593 | |
594 | This is the sensible default for L</sqlt_deploy_callback>. |
595 | |
596 | If a method named C<sqlt_deploy_hook> exists in your Result class, it |
597 | will be called and passed the current C<$source> and the |
598 | C<$sqlt_table> being deployed. |
599 | |
600 | =cut |
601 | |
602 | sub default_sqlt_deploy_hook { |
603 | my $self = shift; |
604 | |
605 | my $class = $self->result_class; |
606 | |
607 | if ($class and $class->can('sqlt_deploy_hook')) { |
608 | $class->sqlt_deploy_hook(@_); |
609 | } |
610 | } |
611 | |
612 | sub _invoke_sqlt_deploy_hook { |
613 | my $self = shift; |
614 | if ( my $hook = $self->sqlt_deploy_callback) { |
615 | $self->$hook(@_); |
616 | } |
617 | } |
618 | |
843f6bc1 |
619 | =head2 resultset |
620 | |
621 | =over 4 |
622 | |
623 | =item Arguments: None |
624 | |
625 | =item Return value: $resultset |
626 | |
627 | =back |
628 | |
629 | Returns a resultset for the given source. This will initially be created |
630 | on demand by calling |
631 | |
632 | $self->resultset_class->new($self, $self->resultset_attributes) |
633 | |
634 | but is cached from then on unless resultset_class changes. |
635 | |
636 | =head2 resultset_class |
637 | |
638 | =over 4 |
639 | |
640 | =item Arguments: $classname |
641 | |
642 | =item Return value: $classname |
643 | |
644 | =back |
645 | |
646 | package My::ResultSetClass; |
647 | use base 'DBIx::Class::ResultSet'; |
648 | ... |
649 | |
650 | $source->resultset_class('My::ResultSet::Class'); |
651 | |
7e51afbf |
652 | Set the class of the resultset. This is useful if you want to create your |
843f6bc1 |
653 | own resultset methods. Create your own class derived from |
654 | L<DBIx::Class::ResultSet>, and set it here. If called with no arguments, |
655 | this method returns the name of the existing resultset class, if one |
656 | exists. |
657 | |
658 | =head2 resultset_attributes |
659 | |
660 | =over 4 |
661 | |
662 | =item Arguments: \%attrs |
663 | |
664 | =item Return value: \%attrs |
665 | |
666 | =back |
667 | |
668 | $source->resultset_attributes({ order_by => [ 'id' ] }); |
669 | |
670 | Store a collection of resultset attributes, that will be set on every |
671 | L<DBIx::Class::ResultSet> produced from this result source. For a full |
672 | list see L<DBIx::Class::ResultSet/ATTRIBUTES>. |
673 | |
674 | =cut |
675 | |
676 | sub resultset { |
677 | my $self = shift; |
678 | $self->throw_exception( |
679 | 'resultset does not take any arguments. If you want another resultset, '. |
680 | 'call it on the schema instead.' |
681 | ) if scalar @_; |
682 | |
683 | return $self->resultset_class->new( |
684 | $self, |
685 | { |
686 | %{$self->{resultset_attributes}}, |
687 | %{$self->schema->default_resultset_attributes} |
688 | }, |
689 | ); |
690 | } |
691 | |
692 | =head2 source_name |
693 | |
694 | =over 4 |
695 | |
696 | =item Arguments: $source_name |
697 | |
698 | =item Result value: $source_name |
699 | |
700 | =back |
701 | |
702 | Set an alternate name for the result source when it is loaded into a schema. |
703 | This is useful if you want to refer to a result source by a name other than |
704 | its class name. |
705 | |
706 | package ArchivedBooks; |
707 | use base qw/DBIx::Class/; |
708 | __PACKAGE__->table('books_archive'); |
709 | __PACKAGE__->source_name('Books'); |
710 | |
711 | # from your schema... |
712 | $schema->resultset('Books')->find(1); |
713 | |
9c992ba1 |
714 | =head2 from |
715 | |
391ccf38 |
716 | =over 4 |
717 | |
718 | =item Arguments: None |
719 | |
720 | =item Return value: FROM clause |
721 | |
722 | =back |
723 | |
724 | my $from_clause = $source->from(); |
725 | |
9c992ba1 |
726 | Returns an expression of the source to be supplied to storage to specify |
2053ab2a |
727 | retrieval from this source. In the case of a database, the required FROM |
728 | clause contents. |
9c992ba1 |
729 | |
f9b7bd6e |
730 | =head2 schema |
731 | |
391ccf38 |
732 | =over 4 |
733 | |
734 | =item Arguments: None |
735 | |
736 | =item Return value: A schema object |
737 | |
738 | =back |
739 | |
740 | my $schema = $source->schema(); |
741 | |
f9b7bd6e |
742 | Returns the L<DBIx::Class::Schema> object that this result source |
391ccf38 |
743 | belongs to. |
9c992ba1 |
744 | |
745 | =head2 storage |
746 | |
391ccf38 |
747 | =over 4 |
748 | |
749 | =item Arguments: None |
750 | |
751 | =item Return value: A Storage object |
752 | |
753 | =back |
754 | |
755 | $source->storage->debug(1); |
756 | |
75d07914 |
757 | Returns the storage handle for the current schema. |
988bf309 |
758 | |
759 | See also: L<DBIx::Class::Storage> |
9c992ba1 |
760 | |
761 | =cut |
762 | |
763 | sub storage { shift->schema->storage; } |
764 | |
8452e496 |
765 | =head2 add_relationship |
766 | |
391ccf38 |
767 | =over 4 |
768 | |
769 | =item Arguments: $relname, $related_source_name, \%cond, [ \%attrs ] |
770 | |
771 | =item Return value: 1/true if it succeeded |
772 | |
773 | =back |
774 | |
8452e496 |
775 | $source->add_relationship('relname', 'related_source', $cond, $attrs); |
776 | |
391ccf38 |
777 | L<DBIx::Class::Relationship> describes a series of methods which |
778 | create pre-defined useful types of relationships. Look there first |
779 | before using this method directly. |
780 | |
24d67825 |
781 | The relationship name can be arbitrary, but must be unique for each |
782 | relationship attached to this result source. 'related_source' should |
783 | be the name with which the related result source was registered with |
784 | the current schema. For example: |
8452e496 |
785 | |
24d67825 |
786 | $schema->source('Book')->add_relationship('reviews', 'Review', { |
787 | 'foreign.book_id' => 'self.id', |
788 | }); |
789 | |
2053ab2a |
790 | The condition C<$cond> needs to be an L<SQL::Abstract>-style |
24d67825 |
791 | representation of the join between the tables. For example, if you're |
391ccf38 |
792 | creating a relation from Author to Book, |
988bf309 |
793 | |
794 | { 'foreign.author_id' => 'self.id' } |
795 | |
796 | will result in the JOIN clause |
797 | |
798 | author me JOIN book foreign ON foreign.author_id = me.id |
799 | |
8452e496 |
800 | You can specify as many foreign => self mappings as necessary. |
801 | |
988bf309 |
802 | Valid attributes are as follows: |
803 | |
804 | =over 4 |
805 | |
806 | =item join_type |
807 | |
808 | Explicitly specifies the type of join to use in the relationship. Any |
809 | SQL join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in |
810 | the SQL command immediately before C<JOIN>. |
811 | |
812 | =item proxy |
813 | |
24d67825 |
814 | An arrayref containing a list of accessors in the foreign class to proxy in |
815 | the main class. If, for example, you do the following: |
002a359a |
816 | |
24d67825 |
817 | CD->might_have(liner_notes => 'LinerNotes', undef, { |
818 | proxy => [ qw/notes/ ], |
819 | }); |
002a359a |
820 | |
24d67825 |
821 | Then, assuming LinerNotes has an accessor named notes, you can do: |
988bf309 |
822 | |
24d67825 |
823 | my $cd = CD->find(1); |
2053ab2a |
824 | # set notes -- LinerNotes object is created if it doesn't exist |
825 | $cd->notes('Notes go here'); |
988bf309 |
826 | |
827 | =item accessor |
828 | |
829 | Specifies the type of accessor that should be created for the |
75d07914 |
830 | relationship. Valid values are C<single> (for when there is only a single |
831 | related object), C<multi> (when there can be many), and C<filter> (for |
832 | when there is a single related object, but you also want the relationship |
833 | accessor to double as a column accessor). For C<multi> accessors, an |
834 | add_to_* method is also created, which calls C<create_related> for the |
988bf309 |
835 | relationship. |
836 | |
8452e496 |
837 | =back |
838 | |
391ccf38 |
839 | Throws an exception if the condition is improperly supplied, or cannot |
840 | be resolved using L</resolve_join>. |
841 | |
8452e496 |
842 | =cut |
843 | |
844 | sub add_relationship { |
845 | my ($self, $rel, $f_source_name, $cond, $attrs) = @_; |
27f01d1f |
846 | $self->throw_exception("Can't create relationship without join condition") |
847 | unless $cond; |
8452e496 |
848 | $attrs ||= {}; |
87772e46 |
849 | |
eba322a7 |
850 | # Check foreign and self are right in cond |
851 | if ( (ref $cond ||'') eq 'HASH') { |
852 | for (keys %$cond) { |
853 | $self->throw_exception("Keys of condition should be of form 'foreign.col', not '$_'") |
854 | if /\./ && !/^foreign\./; |
855 | } |
856 | } |
857 | |
8452e496 |
858 | my %rels = %{ $self->_relationships }; |
859 | $rels{$rel} = { class => $f_source_name, |
87772e46 |
860 | source => $f_source_name, |
8452e496 |
861 | cond => $cond, |
862 | attrs => $attrs }; |
863 | $self->_relationships(\%rels); |
864 | |
30126ac7 |
865 | return $self; |
87772e46 |
866 | |
953a18ef |
867 | # XXX disabled. doesn't work properly currently. skip in tests. |
868 | |
8452e496 |
869 | my $f_source = $self->schema->source($f_source_name); |
870 | unless ($f_source) { |
c037c03a |
871 | $self->ensure_class_loaded($f_source_name); |
8452e496 |
872 | $f_source = $f_source_name->result_source; |
87772e46 |
873 | #my $s_class = ref($self->schema); |
874 | #$f_source_name =~ m/^${s_class}::(.*)$/; |
875 | #$self->schema->register_class(($1 || $f_source_name), $f_source_name); |
876 | #$f_source = $self->schema->source($f_source_name); |
8452e496 |
877 | } |
878 | return unless $f_source; # Can't test rel without f_source |
879 | |
880 | eval { $self->resolve_join($rel, 'me') }; |
881 | |
882 | if ($@) { # If the resolve failed, back out and re-throw the error |
75d07914 |
883 | delete $rels{$rel}; # |
8452e496 |
884 | $self->_relationships(\%rels); |
701da8c4 |
885 | $self->throw_exception("Error creating relationship $rel: $@"); |
8452e496 |
886 | } |
887 | 1; |
888 | } |
889 | |
87c4e602 |
890 | =head2 relationships |
8452e496 |
891 | |
391ccf38 |
892 | =over 4 |
893 | |
894 | =item Arguments: None |
895 | |
896 | =item Return value: List of relationship names |
897 | |
898 | =back |
899 | |
900 | my @relnames = $source->relationships(); |
901 | |
2053ab2a |
902 | Returns all relationship names for this source. |
8452e496 |
903 | |
904 | =cut |
905 | |
906 | sub relationships { |
907 | return keys %{shift->_relationships}; |
908 | } |
909 | |
87c4e602 |
910 | =head2 relationship_info |
911 | |
27f01d1f |
912 | =over 4 |
913 | |
ebc77b53 |
914 | =item Arguments: $relname |
27f01d1f |
915 | |
391ccf38 |
916 | =item Return value: Hashref of relation data, |
917 | |
27f01d1f |
918 | =back |
8452e496 |
919 | |
2053ab2a |
920 | Returns a hash of relationship information for the specified relationship |
391ccf38 |
921 | name. The keys/values are as specified for L</add_relationship>. |
8452e496 |
922 | |
923 | =cut |
924 | |
925 | sub relationship_info { |
926 | my ($self, $rel) = @_; |
927 | return $self->_relationships->{$rel}; |
75d07914 |
928 | } |
8452e496 |
929 | |
87c4e602 |
930 | =head2 has_relationship |
931 | |
27f01d1f |
932 | =over 4 |
933 | |
ebc77b53 |
934 | =item Arguments: $rel |
27f01d1f |
935 | |
391ccf38 |
936 | =item Return value: 1/0 (true/false) |
937 | |
27f01d1f |
938 | =back |
953a18ef |
939 | |
2053ab2a |
940 | Returns true if the source has a relationship of this name, false otherwise. |
988bf309 |
941 | |
942 | =cut |
953a18ef |
943 | |
944 | sub has_relationship { |
945 | my ($self, $rel) = @_; |
946 | return exists $self->_relationships->{$rel}; |
947 | } |
948 | |
de60a93d |
949 | =head2 reverse_relationship_info |
950 | |
951 | =over 4 |
952 | |
953 | =item Arguments: $relname |
954 | |
391ccf38 |
955 | =item Return value: Hashref of relationship data |
956 | |
de60a93d |
957 | =back |
958 | |
391ccf38 |
959 | Looks through all the relationships on the source this relationship |
960 | points to, looking for one whose condition is the reverse of the |
961 | condition on this relationship. |
962 | |
963 | A common use of this is to find the name of the C<belongs_to> relation |
964 | opposing a C<has_many> relation. For definition of these look in |
965 | L<DBIx::Class::Relationship>. |
966 | |
967 | The returned hashref is keyed by the name of the opposing |
968 | relationship, and contains it's data in the same manner as |
969 | L</relationship_info>. |
de60a93d |
970 | |
971 | =cut |
972 | |
973 | sub reverse_relationship_info { |
974 | my ($self, $rel) = @_; |
975 | my $rel_info = $self->relationship_info($rel); |
976 | my $ret = {}; |
977 | |
978 | return $ret unless ((ref $rel_info->{cond}) eq 'HASH'); |
979 | |
980 | my @cond = keys(%{$rel_info->{cond}}); |
981 | my @refkeys = map {/^\w+\.(\w+)$/} @cond; |
982 | my @keys = map {$rel_info->{cond}->{$_} =~ /^\w+\.(\w+)$/} @cond; |
bab77431 |
983 | |
de60a93d |
984 | # Get the related result source for this relationship |
985 | my $othertable = $self->related_source($rel); |
986 | |
987 | # Get all the relationships for that source that related to this source |
988 | # whose foreign column set are our self columns on $rel and whose self |
bab77431 |
989 | # columns are our foreign columns on $rel. |
de60a93d |
990 | my @otherrels = $othertable->relationships(); |
991 | my $otherrelationship; |
992 | foreach my $otherrel (@otherrels) { |
993 | my $otherrel_info = $othertable->relationship_info($otherrel); |
994 | |
995 | my $back = $othertable->related_source($otherrel); |
f3fb2641 |
996 | next unless $back->source_name eq $self->source_name; |
de60a93d |
997 | |
998 | my @othertestconds; |
999 | |
1000 | if (ref $otherrel_info->{cond} eq 'HASH') { |
1001 | @othertestconds = ($otherrel_info->{cond}); |
1002 | } |
1003 | elsif (ref $otherrel_info->{cond} eq 'ARRAY') { |
1004 | @othertestconds = @{$otherrel_info->{cond}}; |
1005 | } |
1006 | else { |
1007 | next; |
1008 | } |
1009 | |
1010 | foreach my $othercond (@othertestconds) { |
1011 | my @other_cond = keys(%$othercond); |
1012 | my @other_refkeys = map {/^\w+\.(\w+)$/} @other_cond; |
1013 | my @other_keys = map {$othercond->{$_} =~ /^\w+\.(\w+)$/} @other_cond; |
bab77431 |
1014 | next if (!$self->compare_relationship_keys(\@refkeys, \@other_keys) || |
de60a93d |
1015 | !$self->compare_relationship_keys(\@other_refkeys, \@keys)); |
1016 | $ret->{$otherrel} = $otherrel_info; |
1017 | } |
1018 | } |
1019 | return $ret; |
1020 | } |
1021 | |
1022 | =head2 compare_relationship_keys |
1023 | |
1024 | =over 4 |
1025 | |
391ccf38 |
1026 | =item Arguments: \@keys1, \@keys2 |
1027 | |
1028 | =item Return value: 1/0 (true/false) |
de60a93d |
1029 | |
1030 | =back |
1031 | |
1032 | Returns true if both sets of keynames are the same, false otherwise. |
1033 | |
1034 | =cut |
1035 | |
1036 | sub compare_relationship_keys { |
1037 | my ($self, $keys1, $keys2) = @_; |
1038 | |
1039 | # Make sure every keys1 is in keys2 |
1040 | my $found; |
1041 | foreach my $key (@$keys1) { |
1042 | $found = 0; |
1043 | foreach my $prim (@$keys2) { |
1044 | if ($prim eq $key) { |
1045 | $found = 1; |
1046 | last; |
1047 | } |
1048 | } |
1049 | last unless $found; |
1050 | } |
1051 | |
1052 | # Make sure every key2 is in key1 |
1053 | if ($found) { |
1054 | foreach my $prim (@$keys2) { |
1055 | $found = 0; |
1056 | foreach my $key (@$keys1) { |
1057 | if ($prim eq $key) { |
1058 | $found = 1; |
1059 | last; |
1060 | } |
1061 | } |
1062 | last unless $found; |
1063 | } |
1064 | } |
1065 | |
1066 | return $found; |
1067 | } |
1068 | |
87c4e602 |
1069 | =head2 resolve_join |
1070 | |
27f01d1f |
1071 | =over 4 |
1072 | |
ebc77b53 |
1073 | =item Arguments: $relation |
27f01d1f |
1074 | |
391ccf38 |
1075 | =item Return value: Join condition arrayref |
1076 | |
27f01d1f |
1077 | =back |
8452e496 |
1078 | |
2053ab2a |
1079 | Returns the join structure required for the related result source. |
8452e496 |
1080 | |
1081 | =cut |
1082 | |
1083 | sub resolve_join { |
24010dd8 |
1084 | my ($self, $join, $alias, $seen, $force_left) = @_; |
489709af |
1085 | $seen ||= {}; |
24010dd8 |
1086 | $force_left ||= { force => 0 }; |
87772e46 |
1087 | if (ref $join eq 'ARRAY') { |
489709af |
1088 | return map { $self->resolve_join($_, $alias, $seen) } @$join; |
87772e46 |
1089 | } elsif (ref $join eq 'HASH') { |
489709af |
1090 | return |
887ce227 |
1091 | map { |
1092 | my $as = ($seen->{$_} ? $_.'_'.($seen->{$_}+1) : $_); |
24010dd8 |
1093 | local $force_left->{force}; |
1094 | ( |
1095 | $self->resolve_join($_, $alias, $seen, $force_left), |
1096 | $self->related_source($_)->resolve_join( |
1097 | $join->{$_}, $as, $seen, $force_left |
1098 | ) |
1099 | ); |
887ce227 |
1100 | } keys %$join; |
87772e46 |
1101 | } elsif (ref $join) { |
701da8c4 |
1102 | $self->throw_exception("No idea how to resolve join reftype ".ref $join); |
87772e46 |
1103 | } else { |
489709af |
1104 | my $count = ++$seen->{$join}; |
1105 | #use Data::Dumper; warn Dumper($seen); |
1106 | my $as = ($count > 1 ? "${join}_${count}" : $join); |
3842b955 |
1107 | my $rel_info = $self->relationship_info($join); |
701da8c4 |
1108 | $self->throw_exception("No such relationship ${join}") unless $rel_info; |
24010dd8 |
1109 | my $type; |
1110 | if ($force_left->{force}) { |
1111 | $type = 'left'; |
1112 | } else { |
1113 | $type = $rel_info->{attrs}{join_type} || ''; |
1114 | $force_left->{force} = 1 if lc($type) eq 'left'; |
1115 | } |
489709af |
1116 | return [ { $as => $self->related_source($join)->from, |
953a18ef |
1117 | -join_type => $type }, |
489709af |
1118 | $self->resolve_condition($rel_info->{cond}, $as, $alias) ]; |
953a18ef |
1119 | } |
1120 | } |
1121 | |
370f2ba2 |
1122 | =head2 pk_depends_on |
1123 | |
1124 | =over 4 |
1125 | |
1126 | =item Arguments: $relname, $rel_data |
1127 | |
391ccf38 |
1128 | =item Return value: 1/0 (true/false) |
1129 | |
370f2ba2 |
1130 | =back |
1131 | |
1132 | Determines whether a relation is dependent on an object from this source |
1133 | having already been inserted. Takes the name of the relationship and a |
1134 | hashref of columns of the related object. |
1135 | |
1136 | =cut |
1137 | |
1138 | sub pk_depends_on { |
1139 | my ($self, $relname, $rel_data) = @_; |
1140 | my $cond = $self->relationship_info($relname)->{cond}; |
1141 | |
1142 | return 0 unless ref($cond) eq 'HASH'; |
1143 | |
1144 | # map { foreign.foo => 'self.bar' } to { bar => 'foo' } |
1145 | |
1146 | my $keyhash = { map { my $x = $_; $x =~ s/.*\.//; $x; } reverse %$cond }; |
1147 | |
1148 | # assume anything that references our PK probably is dependent on us |
1149 | # rather than vice versa, unless the far side is (a) defined or (b) |
1150 | # auto-increment |
1151 | |
1152 | my $rel_source = $self->related_source($relname); |
1153 | |
1154 | foreach my $p ($self->primary_columns) { |
1155 | if (exists $keyhash->{$p}) { |
1156 | unless (defined($rel_data->{$keyhash->{$p}}) |
1157 | || $rel_source->column_info($keyhash->{$p}) |
1158 | ->{is_auto_increment}) { |
1159 | return 0; |
1160 | } |
1161 | } |
1162 | } |
1163 | |
1164 | return 1; |
1165 | } |
1166 | |
87c4e602 |
1167 | =head2 resolve_condition |
1168 | |
27f01d1f |
1169 | =over 4 |
1170 | |
ebc77b53 |
1171 | =item Arguments: $cond, $as, $alias|$object |
27f01d1f |
1172 | |
1173 | =back |
953a18ef |
1174 | |
3842b955 |
1175 | Resolves the passed condition to a concrete query fragment. If given an alias, |
953a18ef |
1176 | returns a join condition; if given an object, inverts that object to produce |
1177 | a related conditional from that object. |
1178 | |
1179 | =cut |
1180 | |
8c368cf3 |
1181 | our $UNRESOLVABLE_CONDITION = \'1 = 0'; |
1182 | |
953a18ef |
1183 | sub resolve_condition { |
489709af |
1184 | my ($self, $cond, $as, $for) = @_; |
953a18ef |
1185 | #warn %$cond; |
1186 | if (ref $cond eq 'HASH') { |
1187 | my %ret; |
bd054cb4 |
1188 | foreach my $k (keys %{$cond}) { |
1189 | my $v = $cond->{$k}; |
953a18ef |
1190 | # XXX should probably check these are valid columns |
27f01d1f |
1191 | $k =~ s/^foreign\.// || |
75d07914 |
1192 | $self->throw_exception("Invalid rel cond key ${k}"); |
27f01d1f |
1193 | $v =~ s/^self\.// || |
75d07914 |
1194 | $self->throw_exception("Invalid rel cond val ${v}"); |
953a18ef |
1195 | if (ref $for) { # Object |
3842b955 |
1196 | #warn "$self $k $for $v"; |
370f2ba2 |
1197 | unless ($for->has_column_loaded($v)) { |
1198 | if ($for->in_storage) { |
6bf6ba2f |
1199 | $self->throw_exception("Column ${v} not loaded on ${for} trying to resolve relationship"); |
370f2ba2 |
1200 | } |
68f3b0dd |
1201 | return $UNRESOLVABLE_CONDITION; |
370f2ba2 |
1202 | } |
1203 | $ret{$k} = $for->get_column($v); |
1204 | #$ret{$k} = $for->get_column($v) if $for->has_column_loaded($v); |
3842b955 |
1205 | #warn %ret; |
2c037e6b |
1206 | } elsif (!defined $for) { # undef, i.e. "no object" |
1207 | $ret{$k} = undef; |
2ec8e594 |
1208 | } elsif (ref $as eq 'HASH') { # reverse hashref |
1209 | $ret{$v} = $as->{$k}; |
fde6e28e |
1210 | } elsif (ref $as) { # reverse object |
1211 | $ret{$v} = $as->get_column($k); |
2c037e6b |
1212 | } elsif (!defined $as) { # undef, i.e. "no reverse object" |
1213 | $ret{$v} = undef; |
953a18ef |
1214 | } else { |
489709af |
1215 | $ret{"${as}.${k}"} = "${for}.${v}"; |
953a18ef |
1216 | } |
953a18ef |
1217 | } |
1218 | return \%ret; |
5efe4c79 |
1219 | } elsif (ref $cond eq 'ARRAY') { |
489709af |
1220 | return [ map { $self->resolve_condition($_, $as, $for) } @$cond ]; |
953a18ef |
1221 | } else { |
1222 | die("Can't handle this yet :("); |
87772e46 |
1223 | } |
1224 | } |
1225 | |
87c4e602 |
1226 | =head2 resolve_prefetch |
1227 | |
27f01d1f |
1228 | =over 4 |
1229 | |
ebc77b53 |
1230 | =item Arguments: hashref/arrayref/scalar |
27f01d1f |
1231 | |
1232 | =back |
988bf309 |
1233 | |
b3e8ac9b |
1234 | Accepts one or more relationships for the current source and returns an |
1235 | array of column names for each of those relationships. Column names are |
1236 | prefixed relative to the current source, in accordance with where they appear |
1237 | in the supplied relationships. Examples: |
1238 | |
5ac6a044 |
1239 | my $source = $schema->resultset('Tag')->source; |
b3e8ac9b |
1240 | @columns = $source->resolve_prefetch( { cd => 'artist' } ); |
1241 | |
1242 | # @columns = |
1243 | #( |
1244 | # 'cd.cdid', |
1245 | # 'cd.artist', |
1246 | # 'cd.title', |
1247 | # 'cd.year', |
1248 | # 'cd.artist.artistid', |
1249 | # 'cd.artist.name' |
1250 | #) |
1251 | |
1252 | @columns = $source->resolve_prefetch( qw[/ cd /] ); |
1253 | |
1254 | # @columns = |
1255 | #( |
1256 | # 'cd.cdid', |
1257 | # 'cd.artist', |
1258 | # 'cd.title', |
1259 | # 'cd.year' |
1260 | #) |
1261 | |
1262 | $source = $schema->resultset('CD')->source; |
1263 | @columns = $source->resolve_prefetch( qw[/ artist producer /] ); |
1264 | |
1265 | # @columns = |
1266 | #( |
1267 | # 'artist.artistid', |
1268 | # 'artist.name', |
1269 | # 'producer.producerid', |
1270 | # 'producer.name' |
75d07914 |
1271 | #) |
988bf309 |
1272 | |
b3e8ac9b |
1273 | =cut |
1274 | |
1275 | sub resolve_prefetch { |
0f66a01b |
1276 | my ($self, $pre, $alias, $seen, $order, $collapse) = @_; |
489709af |
1277 | $seen ||= {}; |
b3e8ac9b |
1278 | #$alias ||= $self->name; |
1279 | #warn $alias, Dumper $pre; |
1280 | if( ref $pre eq 'ARRAY' ) { |
0f66a01b |
1281 | return |
1282 | map { $self->resolve_prefetch( $_, $alias, $seen, $order, $collapse ) } |
1283 | @$pre; |
b3e8ac9b |
1284 | } |
1285 | elsif( ref $pre eq 'HASH' ) { |
1286 | my @ret = |
1287 | map { |
0f66a01b |
1288 | $self->resolve_prefetch($_, $alias, $seen, $order, $collapse), |
489709af |
1289 | $self->related_source($_)->resolve_prefetch( |
0f66a01b |
1290 | $pre->{$_}, "${alias}.$_", $seen, $order, $collapse) |
1291 | } keys %$pre; |
b3e8ac9b |
1292 | #die Dumper \@ret; |
1293 | return @ret; |
1294 | } |
1295 | elsif( ref $pre ) { |
a86b1efe |
1296 | $self->throw_exception( |
1297 | "don't know how to resolve prefetch reftype ".ref($pre)); |
b3e8ac9b |
1298 | } |
1299 | else { |
489709af |
1300 | my $count = ++$seen->{$pre}; |
1301 | my $as = ($count > 1 ? "${pre}_${count}" : $pre); |
b3e8ac9b |
1302 | my $rel_info = $self->relationship_info( $pre ); |
a86b1efe |
1303 | $self->throw_exception( $self->name . " has no such relationship '$pre'" ) |
1304 | unless $rel_info; |
37f23589 |
1305 | my $as_prefix = ($alias =~ /^.*?\.(.+)$/ ? $1.'.' : ''); |
a86b1efe |
1306 | my $rel_source = $self->related_source($pre); |
0f66a01b |
1307 | |
1308 | if (exists $rel_info->{attrs}{accessor} |
1309 | && $rel_info->{attrs}{accessor} eq 'multi') { |
1310 | $self->throw_exception( |
1311 | "Can't prefetch has_many ${pre} (join cond too complex)") |
1312 | unless ref($rel_info->{cond}) eq 'HASH'; |
cb136e67 |
1313 | my $dots = @{[$as_prefix =~ m/\./g]} + 1; # +1 to match the ".${as_prefix}" |
1314 | if (my ($fail) = grep { @{[$_ =~ m/\./g]} == $dots } |
1315 | keys %{$collapse}) { |
1316 | my ($last) = ($fail =~ /([^\.]+)$/); |
616b461d |
1317 | carp ( |
1318 | "Prefetching multiple has_many rels ${last} and ${pre} " |
1319 | .(length($as_prefix) |
1320 | ? "at the same level (${as_prefix}) " |
1321 | : "at top level " |
1322 | ) |
1323 | . 'will currently disrupt both the functionality of $rs->count(), ' |
1324 | . 'and the amount of objects retrievable via $rs->next(). ' |
1325 | . 'Use at your own risk.' |
1326 | ); |
cb136e67 |
1327 | } |
b25e9fa0 |
1328 | #my @col = map { (/^self\.(.+)$/ ? ("${as_prefix}.$1") : ()); } |
1329 | # values %{$rel_info->{cond}}; |
1330 | $collapse->{".${as_prefix}${pre}"} = [ $rel_source->primary_columns ]; |
1331 | # action at a distance. prepending the '.' allows simpler code |
1332 | # in ResultSet->_collapse_result |
37f23589 |
1333 | my @key = map { (/^foreign\.(.+)$/ ? ($1) : ()); } |
0f66a01b |
1334 | keys %{$rel_info->{cond}}; |
5a5bec6c |
1335 | my @ord = (ref($rel_info->{attrs}{order_by}) eq 'ARRAY' |
1336 | ? @{$rel_info->{attrs}{order_by}} |
1337 | : (defined $rel_info->{attrs}{order_by} |
1338 | ? ($rel_info->{attrs}{order_by}) |
1339 | : ())); |
1340 | push(@$order, map { "${as}.$_" } (@key, @ord)); |
0f66a01b |
1341 | } |
1342 | |
489709af |
1343 | return map { [ "${as}.$_", "${as_prefix}${pre}.$_", ] } |
a86b1efe |
1344 | $rel_source->columns; |
b3e8ac9b |
1345 | #warn $alias, Dumper (\@ret); |
489709af |
1346 | #return @ret; |
b3e8ac9b |
1347 | } |
1348 | } |
953a18ef |
1349 | |
87c4e602 |
1350 | =head2 related_source |
1351 | |
27f01d1f |
1352 | =over 4 |
1353 | |
ebc77b53 |
1354 | =item Arguments: $relname |
27f01d1f |
1355 | |
391ccf38 |
1356 | =item Return value: $source |
1357 | |
27f01d1f |
1358 | =back |
87772e46 |
1359 | |
2053ab2a |
1360 | Returns the result source object for the given relationship. |
87772e46 |
1361 | |
1362 | =cut |
1363 | |
1364 | sub related_source { |
1365 | my ($self, $rel) = @_; |
aea52c85 |
1366 | if( !$self->has_relationship( $rel ) ) { |
701da8c4 |
1367 | $self->throw_exception("No such relationship '$rel'"); |
aea52c85 |
1368 | } |
87772e46 |
1369 | return $self->schema->source($self->relationship_info($rel)->{source}); |
8452e496 |
1370 | } |
1371 | |
77254782 |
1372 | =head2 related_class |
1373 | |
27f01d1f |
1374 | =over 4 |
1375 | |
ebc77b53 |
1376 | =item Arguments: $relname |
27f01d1f |
1377 | |
391ccf38 |
1378 | =item Return value: $classname |
1379 | |
27f01d1f |
1380 | =back |
77254782 |
1381 | |
2053ab2a |
1382 | Returns the class name for objects in the given relationship. |
77254782 |
1383 | |
1384 | =cut |
1385 | |
1386 | sub related_class { |
1387 | my ($self, $rel) = @_; |
1388 | if( !$self->has_relationship( $rel ) ) { |
1389 | $self->throw_exception("No such relationship '$rel'"); |
1390 | } |
1391 | return $self->schema->class($self->relationship_info($rel)->{source}); |
1392 | } |
1393 | |
aec3eff1 |
1394 | =head2 handle |
1395 | |
1396 | Obtain a new handle to this source. Returns an instance of a |
1397 | L<DBIx::Class::ResultSourceHandle>. |
1398 | |
1399 | =cut |
1400 | |
1401 | sub handle { |
1402 | return new DBIx::Class::ResultSourceHandle({ |
1403 | schema => $_[0]->schema, |
3441fd57 |
1404 | source_moniker => $_[0]->source_name |
aec3eff1 |
1405 | }); |
1406 | } |
1407 | |
701da8c4 |
1408 | =head2 throw_exception |
1409 | |
2053ab2a |
1410 | See L<DBIx::Class::Schema/"throw_exception">. |
701da8c4 |
1411 | |
1412 | =cut |
1413 | |
1414 | sub throw_exception { |
1415 | my $self = shift; |
75d07914 |
1416 | if (defined $self->schema) { |
701da8c4 |
1417 | $self->schema->throw_exception(@_); |
1418 | } else { |
1419 | croak(@_); |
1420 | } |
1421 | } |
1422 | |
843f6bc1 |
1423 | =head2 source_info |
d2f3e87b |
1424 | |
843f6bc1 |
1425 | Stores a hashref of per-source metadata. No specific key names |
1426 | have yet been standardized, the examples below are purely hypothetical |
1427 | and don't actually accomplish anything on their own: |
391ccf38 |
1428 | |
843f6bc1 |
1429 | __PACKAGE__->source_info({ |
1430 | "_tablespace" => 'fast_disk_array_3', |
1431 | "_engine" => 'InnoDB', |
1432 | }); |
391ccf38 |
1433 | |
843f6bc1 |
1434 | =head2 new |
391ccf38 |
1435 | |
843f6bc1 |
1436 | $class->new(); |
391ccf38 |
1437 | |
843f6bc1 |
1438 | $class->new({attribute_name => value}); |
d2f3e87b |
1439 | |
843f6bc1 |
1440 | Creates a new ResultSource object. Not normally called directly by end users. |
391ccf38 |
1441 | |
843f6bc1 |
1442 | =head2 column_info_from_storage |
1443 | |
1444 | =over |
1445 | |
1446 | =item Arguments: 1/0 (default: 0) |
1447 | |
1448 | =item Return value: 1/0 |
1449 | |
1450 | =back |
1451 | |
880c075b |
1452 | __PACKAGE__->column_info_from_storage(1); |
1453 | |
843f6bc1 |
1454 | Enables the on-demand automatic loading of the above column |
1455 | metadata from storage as neccesary. This is *deprecated*, and |
1456 | should not be used. It will be removed before 1.0. |
1457 | |
f89bb832 |
1458 | |
9c992ba1 |
1459 | =head1 AUTHORS |
1460 | |
1461 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
1462 | |
1463 | =head1 LICENSE |
1464 | |
1465 | You may distribute this code under the same terms as Perl itself. |
1466 | |
1467 | =cut |
1468 | |
b25e9fa0 |
1469 | 1; |