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996be9ee |
1 | package DBIx::Class::Schema::Loader::RelBuilder; |
2 | |
3 | use strict; |
4 | use warnings; |
1ad8e8c3 |
5 | use base 'Class::Accessor::Grouped'; |
942bd5e0 |
6 | use mro 'c3'; |
fa994d3c |
7 | use Carp::Clan qw/^DBIx::Class/; |
1ad8e8c3 |
8 | use Scalar::Util 'weaken'; |
39b22ca9 |
9 | use Lingua::EN::Inflect::Phrase (); |
cc4f11a2 |
10 | use DBIx::Class::Schema::Loader::Utils 'split_name'; |
1ad8e8c3 |
11 | use File::Slurp 'slurp'; |
12 | use Try::Tiny; |
13 | use Class::Unload (); |
14 | use List::MoreUtils 'apply'; |
15 | use namespace::clean; |
996be9ee |
16 | |
f671b630 |
17 | our $VERSION = '0.07002'; |
32f784fc |
18 | |
6e4b7bb1 |
19 | # Glossary: |
20 | # |
21 | # remote_relname -- name of relationship from the local table referring to the remote table |
22 | # local_relname -- name of relationship from the remote table referring to the local table |
23 | # remote_method -- relationship type from remote table to local table, usually has_many |
24 | |
996be9ee |
25 | =head1 NAME |
26 | |
27 | DBIx::Class::Schema::Loader::RelBuilder - Builds relationships for DBIx::Class::Schema::Loader |
28 | |
29 | =head1 SYNOPSIS |
30 | |
19b7d71c |
31 | See L<DBIx::Class::Schema::Loader> and L<DBIx::Class::Schema::Loader::Base>. |
996be9ee |
32 | |
33 | =head1 DESCRIPTION |
34 | |
35 | This class builds relationships for L<DBIx::Class::Schema::Loader>. This |
36 | is module is not (yet) for external use. |
37 | |
38 | =head1 METHODS |
39 | |
40 | =head2 new |
41 | |
4c7b5f46 |
42 | Arguments: $base object |
996be9ee |
43 | |
44 | =head2 generate_code |
45 | |
e8ad6491 |
46 | Arguments: local_moniker (scalar), fk_info (arrayref) |
47 | |
48 | This generates the code for the relationships of a given table. |
49 | |
50 | C<local_moniker> is the moniker name of the table which had the REFERENCES |
51 | statements. The fk_info arrayref's contents should take the form: |
52 | |
53 | [ |
54 | { |
55 | local_columns => [ 'col2', 'col3' ], |
56 | remote_columns => [ 'col5', 'col7' ], |
57 | remote_moniker => 'AnotherTableMoniker', |
58 | }, |
59 | { |
60 | local_columns => [ 'col1', 'col4' ], |
61 | remote_columns => [ 'col1', 'col2' ], |
62 | remote_moniker => 'YetAnotherTableMoniker', |
63 | }, |
64 | # ... |
65 | ], |
66 | |
67 | This method will return the generated relationships as a hashref keyed on the |
68 | class names. The values are arrayrefs of hashes containing method name and |
69 | arguments, like so: |
996be9ee |
70 | |
71 | { |
72 | 'Some::Source::Class' => [ |
b97c2c1e |
73 | { method => 'belongs_to', arguments => [ 'col1', 'Another::Source::Class' ], |
74 | { method => 'has_many', arguments => [ 'anothers', 'Yet::Another::Source::Class', 'col15' ], |
996be9ee |
75 | ], |
76 | 'Another::Source::Class' => [ |
77 | # ... |
78 | ], |
79 | # ... |
80 | } |
8f9d7ce5 |
81 | |
996be9ee |
82 | =cut |
83 | |
1ad8e8c3 |
84 | __PACKAGE__->mk_group_accessors('simple', qw/ |
85 | base |
86 | schema |
87 | inflect_plural |
88 | inflect_singular |
89 | relationship_attrs |
90 | _temp_classes |
91 | /); |
4c7b5f46 |
92 | |
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93 | sub new { |
4c7b5f46 |
94 | my ( $class, $base ) = @_; |
95 | |
96 | # from old POD about this constructor: |
97 | # C<$schema_class> should be a schema class name, where the source |
98 | # classes have already been set up and registered. Column info, |
99 | # primary key, and unique constraints will be drawn from this |
100 | # schema for all of the existing source monikers. |
101 | |
102 | # Options inflect_plural and inflect_singular are optional, and |
103 | # are better documented in L<DBIx::Class::Schema::Loader::Base>. |
996be9ee |
104 | |
105 | my $self = { |
4c7b5f46 |
106 | base => $base, |
107 | schema => $base->schema, |
108 | inflect_plural => $base->inflect_plural, |
109 | inflect_singular => $base->inflect_singular, |
110 | relationship_attrs => $base->relationship_attrs, |
1ad8e8c3 |
111 | _temp_classes => [], |
996be9ee |
112 | }; |
113 | |
1ad8e8c3 |
114 | weaken $self->{base}; #< don't leak |
115 | |
116 | bless $self => $class; |
4c7b5f46 |
117 | |
c8c27020 |
118 | # validate the relationship_attrs arg |
1ad8e8c3 |
119 | if( defined $self->relationship_attrs ) { |
120 | ref $self->relationship_attrs eq 'HASH' |
c8c27020 |
121 | or croak "relationship_attrs must be a hashref"; |
122 | } |
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123 | |
1ad8e8c3 |
124 | return $self; |
996be9ee |
125 | } |
126 | |
127 | |
128 | # pluralize a relationship name |
129 | sub _inflect_plural { |
ecf930e6 |
130 | my ($self, $relname) = @_; |
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131 | |
39ef3bfe |
132 | return '' if !defined $relname || $relname eq ''; |
133 | |
1ad8e8c3 |
134 | if( ref $self->inflect_plural eq 'HASH' ) { |
135 | return $self->inflect_plural->{$relname} |
136 | if exists $self->inflect_plural->{$relname}; |
996be9ee |
137 | } |
1ad8e8c3 |
138 | elsif( ref $self->inflect_plural eq 'CODE' ) { |
139 | my $inflected = $self->inflect_plural->($relname); |
996be9ee |
140 | return $inflected if $inflected; |
141 | } |
142 | |
ecf930e6 |
143 | return $self->_to_PL($relname); |
996be9ee |
144 | } |
145 | |
146 | # Singularize a relationship name |
147 | sub _inflect_singular { |
ecf930e6 |
148 | my ($self, $relname) = @_; |
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149 | |
39ef3bfe |
150 | return '' if !defined $relname || $relname eq ''; |
151 | |
1ad8e8c3 |
152 | if( ref $self->inflect_singular eq 'HASH' ) { |
153 | return $self->inflect_singular->{$relname} |
154 | if exists $self->inflect_singular->{$relname}; |
996be9ee |
155 | } |
1ad8e8c3 |
156 | elsif( ref $self->inflect_singular eq 'CODE' ) { |
157 | my $inflected = $self->inflect_singular->($relname); |
996be9ee |
158 | return $inflected if $inflected; |
159 | } |
160 | |
ecf930e6 |
161 | return $self->_to_S($relname); |
c496748b |
162 | } |
163 | |
164 | sub _to_PL { |
165 | my ($self, $name) = @_; |
166 | |
167 | $name =~ s/_/ /g; |
39b22ca9 |
168 | my $plural = Lingua::EN::Inflect::Phrase::to_PL($name); |
c496748b |
169 | $plural =~ s/ /_/g; |
170 | |
171 | return $plural; |
172 | } |
173 | |
c496748b |
174 | sub _to_S { |
175 | my ($self, $name) = @_; |
176 | |
39b22ca9 |
177 | $name =~ s/_/ /g; |
178 | my $singular = Lingua::EN::Inflect::Phrase::to_S($name); |
179 | $singular =~ s/ /_/g; |
180 | |
181 | return $singular; |
996be9ee |
182 | } |
183 | |
53ef681d |
184 | sub _default_relationship_attrs { +{ |
185 | has_many => { |
186 | cascade_delete => 0, |
187 | cascade_copy => 0, |
188 | }, |
189 | might_have => { |
190 | cascade_delete => 0, |
191 | cascade_copy => 0, |
192 | }, |
193 | belongs_to => { |
194 | on_delete => 'CASCADE', |
195 | on_update => 'CASCADE', |
aa0867ee |
196 | is_deferrable => 1, |
53ef681d |
197 | }, |
198 | } } |
199 | |
c8c27020 |
200 | # accessor for options to be passed to each generated relationship |
201 | # type. take single argument, the relationship type name, and returns |
202 | # either a hashref (if some options are set), or nothing |
203 | sub _relationship_attrs { |
204 | my ( $self, $reltype ) = @_; |
1ad8e8c3 |
205 | my $r = $self->relationship_attrs; |
c8c27020 |
206 | |
53ef681d |
207 | my %composite = ( |
208 | %{ $self->_default_relationship_attrs->{$reltype} || {} }, |
209 | %{ $r->{all} || {} } |
210 | ); |
211 | |
c8c27020 |
212 | if( my $specific = $r->{$reltype} ) { |
213 | while( my ($k,$v) = each %$specific ) { |
214 | $composite{$k} = $v; |
215 | } |
216 | } |
217 | return \%composite; |
218 | } |
219 | |
26f1c8c9 |
220 | sub _array_eq { |
ecf930e6 |
221 | my ($self, $a, $b) = @_; |
26f1c8c9 |
222 | |
223 | return unless @$a == @$b; |
224 | |
225 | for (my $i = 0; $i < @$a; $i++) { |
226 | return unless $a->[$i] eq $b->[$i]; |
227 | } |
228 | return 1; |
229 | } |
230 | |
c39e403e |
231 | sub _remote_attrs { |
c496748b |
232 | my ($self, $local_moniker, $local_cols) = @_; |
c39e403e |
233 | |
c496748b |
234 | # get our base set of attrs from _relationship_attrs, if present |
235 | my $attrs = $self->_relationship_attrs('belongs_to') || {}; |
c8c27020 |
236 | |
c496748b |
237 | # If the referring column is nullable, make 'belongs_to' an |
238 | # outer join, unless explicitly set by relationship_attrs |
1ad8e8c3 |
239 | my $nullable = grep { $self->schema->source($local_moniker)->column_info($_)->{is_nullable} } @$local_cols; |
c496748b |
240 | $attrs->{join_type} = 'LEFT' if $nullable && !defined $attrs->{join_type}; |
c39e403e |
241 | |
c496748b |
242 | return $attrs; |
c39e403e |
243 | } |
244 | |
414c61a0 |
245 | sub _sanitize_name { |
246 | my ($self, $name) = @_; |
247 | |
248 | if (ref $name) { |
249 | # scalar ref for weird table name (like one containing a '.') |
250 | ($name = $$name) =~ s/\W+/_/g; |
251 | } |
252 | else { |
253 | # remove 'schema.' prefix if any |
254 | $name =~ s/^[^.]+\.//; |
255 | } |
256 | |
257 | return $name; |
258 | } |
259 | |
19b7d71c |
260 | sub _normalize_name { |
261 | my ($self, $name) = @_; |
262 | |
414c61a0 |
263 | $name = $self->_sanitize_name($name); |
264 | |
cc4f11a2 |
265 | my @words = split_name $name; |
19b7d71c |
266 | |
267 | return join '_', map lc, @words; |
268 | } |
269 | |
f2fc8d01 |
270 | sub _remote_relname { |
271 | my ($self, $remote_table, $cond) = @_; |
272 | |
273 | my $remote_relname; |
274 | # for single-column case, set the remote relname to the column |
275 | # name, to make filter accessors work, but strip trailing _id |
276 | if(scalar keys %{$cond} == 1) { |
277 | my ($col) = values %{$cond}; |
19b7d71c |
278 | $col = $self->_normalize_name($col); |
f2fc8d01 |
279 | $col =~ s/_id$//; |
280 | $remote_relname = $self->_inflect_singular($col); |
281 | } |
282 | else { |
19b7d71c |
283 | $remote_relname = $self->_inflect_singular($self->_normalize_name($remote_table)); |
f2fc8d01 |
284 | } |
285 | |
286 | return $remote_relname; |
287 | } |
288 | |
996be9ee |
289 | sub generate_code { |
26f1c8c9 |
290 | my ($self, $local_moniker, $rels, $uniqs) = @_; |
996be9ee |
291 | |
292 | my $all_code = {}; |
293 | |
1ad8e8c3 |
294 | my $local_class = $self->schema->class($local_moniker); |
057fbb08 |
295 | |
e8ad6491 |
296 | my %counters; |
297 | foreach my $rel (@$rels) { |
298 | next if !$rel->{remote_source}; |
299 | $counters{$rel->{remote_source}}++; |
300 | } |
301 | |
302 | foreach my $rel (@$rels) { |
057fbb08 |
303 | my $remote_moniker = $rel->{remote_source} |
304 | or next; |
305 | |
1ad8e8c3 |
306 | my $remote_class = $self->schema->class($remote_moniker); |
307 | my $remote_obj = $self->schema->source($remote_moniker); |
057fbb08 |
308 | my $remote_cols = $rel->{remote_columns} || [ $remote_obj->primary_columns ]; |
309 | |
310 | my $local_cols = $rel->{local_columns}; |
e8ad6491 |
311 | |
312 | if($#$local_cols != $#$remote_cols) { |
313 | croak "Column count mismatch: $local_moniker (@$local_cols) " |
314 | . "$remote_moniker (@$remote_cols)"; |
996be9ee |
315 | } |
316 | |
e8ad6491 |
317 | my %cond; |
318 | foreach my $i (0 .. $#$local_cols) { |
319 | $cond{$remote_cols->[$i]} = $local_cols->[$i]; |
320 | } |
996be9ee |
321 | |
057fbb08 |
322 | my ( $local_relname, $remote_relname, $remote_method ) = |
39ef3bfe |
323 | $self->_relnames_and_method( $local_moniker, $rel, \%cond, $uniqs, \%counters ); |
7dba7c70 |
324 | |
e8ad6491 |
325 | push(@{$all_code->{$local_class}}, |
326 | { method => 'belongs_to', |
327 | args => [ $remote_relname, |
328 | $remote_class, |
329 | \%cond, |
c39e403e |
330 | $self->_remote_attrs($local_moniker, $local_cols), |
e8ad6491 |
331 | ], |
996be9ee |
332 | } |
e8ad6491 |
333 | ); |
334 | |
057fbb08 |
335 | my %rev_cond = reverse %cond; |
336 | for (keys %rev_cond) { |
337 | $rev_cond{"foreign.$_"} = "self.".$rev_cond{$_}; |
338 | delete $rev_cond{$_}; |
339 | } |
340 | |
e8ad6491 |
341 | push(@{$all_code->{$remote_class}}, |
26f1c8c9 |
342 | { method => $remote_method, |
e8ad6491 |
343 | args => [ $local_relname, |
344 | $local_class, |
345 | \%rev_cond, |
c8c27020 |
346 | $self->_relationship_attrs($remote_method), |
e8ad6491 |
347 | ], |
348 | } |
349 | ); |
996be9ee |
350 | } |
351 | |
352 | return $all_code; |
353 | } |
354 | |
39ef3bfe |
355 | sub _relnames_and_method { |
057fbb08 |
356 | my ( $self, $local_moniker, $rel, $cond, $uniqs, $counters ) = @_; |
e9c09ed9 |
357 | |
057fbb08 |
358 | my $remote_moniker = $rel->{remote_source}; |
1ad8e8c3 |
359 | my $remote_obj = $self->schema->source( $remote_moniker ); |
360 | my $remote_class = $self->schema->class( $remote_moniker ); |
ecf930e6 |
361 | my $remote_relname = $self->_remote_relname( $remote_obj->from, $cond); |
fa6f8d4e |
362 | |
1ad8e8c3 |
363 | my $local_cols = $rel->{local_columns}; |
364 | my $local_table = $self->schema->source($local_moniker)->from; |
365 | my $local_class = $self->schema->class($local_moniker); |
366 | my $local_source = $self->schema->source($local_moniker); |
057fbb08 |
367 | |
1ad8e8c3 |
368 | my $local_relname_uninflected = $self->_normalize_name($local_table); |
369 | my $local_relname = $self->_inflect_plural($self->_normalize_name($local_table)); |
fa6f8d4e |
370 | |
057fbb08 |
371 | my $remote_method = 'has_many'; |
372 | |
373 | # If the local columns have a UNIQUE constraint, this is a one-to-one rel |
ecf930e6 |
374 | if ($self->_array_eq([ $local_source->primary_columns ], $local_cols) || |
375 | grep { $self->_array_eq($_->[1], $local_cols) } @$uniqs) { |
057fbb08 |
376 | $remote_method = 'might_have'; |
c496748b |
377 | $local_relname = $self->_inflect_singular($local_relname_uninflected); |
057fbb08 |
378 | } |
fa6f8d4e |
379 | |
1ad8e8c3 |
380 | # If more than one rel between this pair of tables, use the local |
381 | # col names to distinguish, unless the rel was created previously. |
382 | if ($counters->{$remote_moniker} > 1) { |
383 | my $relationship_exists = 0; |
384 | |
6e4b7bb1 |
385 | if (-f (my $existing_remote_file = $self->base->get_dump_filename($remote_class))) { |
1ad8e8c3 |
386 | my $class = "${remote_class}Temporary"; |
387 | |
388 | if (not do { no strict 'refs'; %{$class . '::'} }) { |
389 | my $code = slurp $existing_remote_file; |
390 | |
391 | $code =~ s/(?<=package $remote_class)/Temporary/g; |
392 | |
6e4b7bb1 |
393 | $code =~ s/__PACKAGE__->meta->make_immutable[^;]*;//g; |
1ad8e8c3 |
394 | |
395 | eval $code; |
396 | die $@ if $@; |
397 | |
398 | push @{ $self->_temp_classes }, $class; |
399 | } |
400 | |
401 | if ($class->has_relationship($local_relname)) { |
402 | my $rel_cols = [ sort { $a cmp $b } apply { s/^foreign\.//i } |
403 | (keys %{ $class->relationship_info($local_relname)->{cond} }) ]; |
404 | |
405 | $relationship_exists = 1 if $self->_array_eq([ sort @$local_cols ], $rel_cols); |
406 | } |
407 | } |
408 | |
409 | if (not $relationship_exists) { |
410 | my $colnames = q{_} . $self->_normalize_name(join '_', @$local_cols); |
411 | $remote_relname .= $colnames if keys %$cond > 1; |
412 | |
413 | $local_relname = $self->_normalize_name($local_table . $colnames); |
414 | $local_relname =~ s/_id$//; |
415 | |
416 | $local_relname_uninflected = $local_relname; |
417 | $local_relname = $self->_inflect_plural($local_relname); |
418 | |
419 | # if colnames were added and this is a might_have, re-inflect |
420 | if ($remote_method eq 'might_have') { |
421 | $local_relname = $self->_inflect_singular($local_relname_uninflected); |
422 | } |
423 | } |
424 | } |
425 | |
057fbb08 |
426 | return ( $local_relname, $remote_relname, $remote_method ); |
fa6f8d4e |
427 | } |
428 | |
1ad8e8c3 |
429 | sub cleanup { |
430 | my $self = shift; |
431 | |
432 | for my $class (@{ $self->_temp_classes }) { |
433 | Class::Unload->unload($class); |
434 | } |
435 | |
436 | $self->_temp_classes([]); |
437 | } |
438 | |
be80bba7 |
439 | =head1 AUTHOR |
440 | |
9cc8e7e1 |
441 | See L<DBIx::Class::Schema::Loader/AUTHOR> and L<DBIx::Class::Schema::Loader/CONTRIBUTORS>. |
be80bba7 |
442 | |
443 | =head1 LICENSE |
444 | |
445 | This library is free software; you can redistribute it and/or modify it under |
446 | the same terms as Perl itself. |
447 | |
448 | =cut |
449 | |
996be9ee |
450 | 1; |
19b7d71c |
451 | # vim:et sts=4 sw=4 tw=0: |