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1 | package DBIx::Class::Schema::Loader::RelBuilder; |
2 | |
3 | use strict; |
4 | use warnings; |
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5 | use Class::C3; |
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6 | use Carp::Clan qw/^DBIx::Class/; |
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7 | use Lingua::EN::Inflect::Number (); |
8 | |
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9 | our $VERSION = '0.05003'; |
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10 | |
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11 | =head1 NAME |
12 | |
13 | DBIx::Class::Schema::Loader::RelBuilder - Builds relationships for DBIx::Class::Schema::Loader |
14 | |
15 | =head1 SYNOPSIS |
16 | |
17 | See L<DBIx::Class::Schema::Loader> |
18 | |
19 | =head1 DESCRIPTION |
20 | |
21 | This class builds relationships for L<DBIx::Class::Schema::Loader>. This |
22 | is module is not (yet) for external use. |
23 | |
24 | =head1 METHODS |
25 | |
26 | =head2 new |
27 | |
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28 | Arguments: schema_class (scalar), inflect_plural, inflect_singular |
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29 | |
30 | C<$schema_class> should be a schema class name, where the source |
31 | classes have already been set up and registered. Column info, primary |
32 | key, and unique constraints will be drawn from this schema for all |
33 | of the existing source monikers. |
34 | |
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35 | Options inflect_plural and inflect_singular are optional, and are better documented |
36 | in L<DBIx::Class::Schema::Loader::Base>. |
37 | |
38 | =head2 generate_code |
39 | |
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40 | Arguments: local_moniker (scalar), fk_info (arrayref) |
41 | |
42 | This generates the code for the relationships of a given table. |
43 | |
44 | C<local_moniker> is the moniker name of the table which had the REFERENCES |
45 | statements. The fk_info arrayref's contents should take the form: |
46 | |
47 | [ |
48 | { |
49 | local_columns => [ 'col2', 'col3' ], |
50 | remote_columns => [ 'col5', 'col7' ], |
51 | remote_moniker => 'AnotherTableMoniker', |
52 | }, |
53 | { |
54 | local_columns => [ 'col1', 'col4' ], |
55 | remote_columns => [ 'col1', 'col2' ], |
56 | remote_moniker => 'YetAnotherTableMoniker', |
57 | }, |
58 | # ... |
59 | ], |
60 | |
61 | This method will return the generated relationships as a hashref keyed on the |
62 | class names. The values are arrayrefs of hashes containing method name and |
63 | arguments, like so: |
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64 | |
65 | { |
66 | 'Some::Source::Class' => [ |
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67 | { method => 'belongs_to', arguments => [ 'col1', 'Another::Source::Class' ], |
68 | { method => 'has_many', arguments => [ 'anothers', 'Yet::Another::Source::Class', 'col15' ], |
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69 | ], |
70 | 'Another::Source::Class' => [ |
71 | # ... |
72 | ], |
73 | # ... |
74 | } |
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75 | |
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76 | =cut |
77 | |
78 | sub new { |
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79 | |
80 | my ( $class, $schema, $inflect_pl, $inflect_singular, $rel_attrs ) = @_; |
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81 | |
82 | my $self = { |
83 | schema => $schema, |
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84 | inflect_plural => $inflect_pl, |
85 | inflect_singular => $inflect_singular, |
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86 | relationship_attrs => $rel_attrs, |
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87 | }; |
88 | |
c8c27020 |
89 | # validate the relationship_attrs arg |
90 | if( defined $self->{relationship_attrs} ) { |
91 | ref($self->{relationship_attrs}) eq 'HASH' |
92 | or croak "relationship_attrs must be a hashref"; |
93 | } |
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94 | |
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95 | return bless $self => $class; |
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96 | } |
97 | |
98 | |
99 | # pluralize a relationship name |
100 | sub _inflect_plural { |
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101 | my ($self, $relname, $method) = @_; |
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102 | |
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103 | return '' if !defined $relname || $relname eq ''; |
104 | |
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105 | if( ref $self->{inflect_plural} eq 'HASH' ) { |
106 | return $self->{inflect_plural}->{$relname} |
107 | if exists $self->{inflect_plural}->{$relname}; |
108 | } |
109 | elsif( ref $self->{inflect_plural} eq 'CODE' ) { |
110 | my $inflected = $self->{inflect_plural}->($relname); |
111 | return $inflected if $inflected; |
112 | } |
113 | |
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114 | $method ||= '_to_PL'; |
115 | |
116 | return $self->$method($relname); |
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117 | } |
118 | |
119 | # Singularize a relationship name |
120 | sub _inflect_singular { |
121 | my ($self, $relname) = @_; |
122 | |
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123 | return '' if !defined $relname || $relname eq ''; |
124 | |
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125 | if( ref $self->{inflect_singular} eq 'HASH' ) { |
126 | return $self->{inflect_singular}->{$relname} |
127 | if exists $self->{inflect_singular}->{$relname}; |
128 | } |
129 | elsif( ref $self->{inflect_singular} eq 'CODE' ) { |
130 | my $inflected = $self->{inflect_singular}->($relname); |
131 | return $inflected if $inflected; |
132 | } |
133 | |
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134 | return $self->_to_S($relname); |
135 | } |
136 | |
137 | sub _to_PL { |
138 | my ($self, $name) = @_; |
139 | |
140 | $name =~ s/_/ /g; |
141 | my $plural = Lingua::EN::Inflect::Number::to_PL($name); |
142 | $plural =~ s/ /_/g; |
143 | |
144 | return $plural; |
145 | } |
146 | |
147 | sub _old_to_PL { |
148 | my ($self, $name) = @_; |
149 | |
150 | return Lingua::EN::Inflect::Number::to_PL($name); |
151 | } |
152 | |
153 | sub _to_S { |
154 | my ($self, $name) = @_; |
155 | |
156 | return Lingua::EN::Inflect::Number::to_S($name); |
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157 | } |
158 | |
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159 | # accessor for options to be passed to each generated relationship |
160 | # type. take single argument, the relationship type name, and returns |
161 | # either a hashref (if some options are set), or nothing |
162 | sub _relationship_attrs { |
163 | my ( $self, $reltype ) = @_; |
164 | my $r = $self->{relationship_attrs}; |
165 | return unless $r && ( $r->{all} || $r->{$reltype} ); |
166 | |
167 | my %composite = %{ $r->{all} || {} }; |
168 | if( my $specific = $r->{$reltype} ) { |
169 | while( my ($k,$v) = each %$specific ) { |
170 | $composite{$k} = $v; |
171 | } |
172 | } |
173 | return \%composite; |
174 | } |
175 | |
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176 | sub _array_eq { |
177 | my ($a, $b) = @_; |
178 | |
179 | return unless @$a == @$b; |
180 | |
181 | for (my $i = 0; $i < @$a; $i++) { |
182 | return unless $a->[$i] eq $b->[$i]; |
183 | } |
184 | return 1; |
185 | } |
186 | |
c39e403e |
187 | sub _remote_attrs { |
c496748b |
188 | my ($self, $local_moniker, $local_cols) = @_; |
c39e403e |
189 | |
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190 | # get our base set of attrs from _relationship_attrs, if present |
191 | my $attrs = $self->_relationship_attrs('belongs_to') || {}; |
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192 | |
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193 | # If the referring column is nullable, make 'belongs_to' an |
194 | # outer join, unless explicitly set by relationship_attrs |
195 | my $nullable = grep { $self->{schema}->source($local_moniker)->column_info($_)->{is_nullable} } @$local_cols; |
196 | $attrs->{join_type} = 'LEFT' if $nullable && !defined $attrs->{join_type}; |
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197 | |
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198 | return $attrs; |
c39e403e |
199 | } |
200 | |
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201 | sub _remote_relname { |
202 | my ($self, $remote_table, $cond) = @_; |
203 | |
204 | my $remote_relname; |
205 | # for single-column case, set the remote relname to the column |
206 | # name, to make filter accessors work, but strip trailing _id |
207 | if(scalar keys %{$cond} == 1) { |
208 | my ($col) = values %{$cond}; |
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209 | $col = lc $col; |
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210 | $col =~ s/_id$//; |
211 | $remote_relname = $self->_inflect_singular($col); |
212 | } |
213 | else { |
214 | $remote_relname = $self->_inflect_singular(lc $remote_table); |
215 | } |
216 | |
217 | return $remote_relname; |
218 | } |
219 | |
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220 | sub generate_code { |
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221 | my ($self, $local_moniker, $rels, $uniqs) = @_; |
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222 | |
223 | my $all_code = {}; |
224 | |
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225 | my $local_class = $self->{schema}->class($local_moniker); |
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226 | |
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227 | my %counters; |
228 | foreach my $rel (@$rels) { |
229 | next if !$rel->{remote_source}; |
230 | $counters{$rel->{remote_source}}++; |
231 | } |
232 | |
233 | foreach my $rel (@$rels) { |
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234 | my $remote_moniker = $rel->{remote_source} |
235 | or next; |
236 | |
237 | my $remote_class = $self->{schema}->class($remote_moniker); |
238 | my $remote_obj = $self->{schema}->source($remote_moniker); |
239 | my $remote_cols = $rel->{remote_columns} || [ $remote_obj->primary_columns ]; |
240 | |
241 | my $local_cols = $rel->{local_columns}; |
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242 | |
243 | if($#$local_cols != $#$remote_cols) { |
244 | croak "Column count mismatch: $local_moniker (@$local_cols) " |
245 | . "$remote_moniker (@$remote_cols)"; |
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246 | } |
247 | |
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248 | my %cond; |
249 | foreach my $i (0 .. $#$local_cols) { |
250 | $cond{$remote_cols->[$i]} = $local_cols->[$i]; |
251 | } |
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252 | |
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253 | my ( $local_relname, $remote_relname, $remote_method ) = |
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254 | $self->_relnames_and_method( $local_moniker, $rel, \%cond, $uniqs, \%counters ); |
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255 | |
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256 | push(@{$all_code->{$local_class}}, |
257 | { method => 'belongs_to', |
258 | args => [ $remote_relname, |
259 | $remote_class, |
260 | \%cond, |
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261 | $self->_remote_attrs($local_moniker, $local_cols), |
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262 | ], |
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263 | } |
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264 | ); |
265 | |
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266 | my %rev_cond = reverse %cond; |
267 | for (keys %rev_cond) { |
268 | $rev_cond{"foreign.$_"} = "self.".$rev_cond{$_}; |
269 | delete $rev_cond{$_}; |
270 | } |
271 | |
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272 | push(@{$all_code->{$remote_class}}, |
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273 | { method => $remote_method, |
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274 | args => [ $local_relname, |
275 | $local_class, |
276 | \%rev_cond, |
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277 | $self->_relationship_attrs($remote_method), |
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278 | ], |
279 | } |
280 | ); |
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281 | } |
282 | |
283 | return $all_code; |
284 | } |
285 | |
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286 | sub _relnames_and_method { |
057fbb08 |
287 | my ( $self, $local_moniker, $rel, $cond, $uniqs, $counters ) = @_; |
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288 | |
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289 | my $remote_moniker = $rel->{remote_source}; |
290 | my $remote_obj = $self->{schema}->source( $remote_moniker ); |
291 | my $remote_class = $self->{schema}->class( $remote_moniker ); |
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292 | my $remote_relname = lc $self->_remote_relname( $remote_obj->from, $cond); |
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293 | |
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294 | my $local_cols = $rel->{local_columns}; |
295 | my $local_table = $self->{schema}->source($local_moniker)->from; |
296 | |
297 | # If more than one rel between this pair of tables, use the local |
298 | # col names to distinguish |
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299 | my ($local_relname, $old_local_relname, $local_relname_uninflected, $old_local_relname_uninflected); |
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300 | if ( $counters->{$remote_moniker} > 1) { |
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301 | my $colnames = lc(q{_} . join(q{_}, @$local_cols)); |
057fbb08 |
302 | $remote_relname .= $colnames if keys %$cond > 1; |
303 | |
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304 | $local_relname = lc($local_table) . $colnames; |
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305 | $local_relname =~ s/_id$//; |
306 | |
307 | $local_relname_uninflected = $local_relname; |
057fbb08 |
308 | $local_relname = $self->_inflect_plural( $local_relname ); |
309 | |
c496748b |
310 | $old_local_relname_uninflected = lc($local_table) . $colnames; |
311 | $old_local_relname = $self->_inflect_plural( lc($local_table) . $colnames, '_old_to_PL' ); |
312 | |
057fbb08 |
313 | } else { |
c496748b |
314 | $local_relname_uninflected = lc $local_table; |
057fbb08 |
315 | $local_relname = $self->_inflect_plural(lc $local_table); |
c496748b |
316 | |
317 | $old_local_relname_uninflected = lc $local_table; |
318 | $old_local_relname = $self->_inflect_plural(lc $local_table, '_old_to_PL'); |
057fbb08 |
319 | } |
fa6f8d4e |
320 | |
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321 | my $remote_method = 'has_many'; |
322 | |
323 | # If the local columns have a UNIQUE constraint, this is a one-to-one rel |
324 | my $local_source = $self->{schema}->source($local_moniker); |
325 | if (_array_eq([ $local_source->primary_columns ], $local_cols) || |
326 | grep { _array_eq($_->[1], $local_cols) } @$uniqs) { |
327 | $remote_method = 'might_have'; |
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328 | $local_relname = $self->_inflect_singular($local_relname_uninflected); |
329 | $old_local_relname = $self->_inflect_singular($old_local_relname_uninflected); |
057fbb08 |
330 | } |
fa6f8d4e |
331 | |
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332 | warn __PACKAGE__." $VERSION: renaming ${remote_class} relation '$old_local_relname' to '$local_relname'. This behavior is new as of 0.05003.\n" if $old_local_relname && $local_relname ne $old_local_relname; |
fa6f8d4e |
333 | |
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334 | return ( $local_relname, $remote_relname, $remote_method ); |
fa6f8d4e |
335 | } |
336 | |
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337 | =head1 AUTHOR |
338 | |
9cc8e7e1 |
339 | See L<DBIx::Class::Schema::Loader/AUTHOR> and L<DBIx::Class::Schema::Loader/CONTRIBUTORS>. |
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340 | |
341 | =head1 LICENSE |
342 | |
343 | This library is free software; you can redistribute it and/or modify it under |
344 | the same terms as Perl itself. |
345 | |
346 | =cut |
347 | |
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348 | 1; |