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1 | package DBIx::Class::Schema::Loader::RelBuilder; |
2 | |
3 | use strict; |
4 | use warnings; |
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5 | use Carp::Clan qw/^DBIx::Class/; |
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6 | use Lingua::EN::Inflect (); |
7 | use Lingua::EN::Inflect::Number (); |
8 | |
9 | =head1 NAME |
10 | |
11 | DBIx::Class::Schema::Loader::RelBuilder - Builds relationships for DBIx::Class::Schema::Loader |
12 | |
13 | =head1 SYNOPSIS |
14 | |
15 | See L<DBIx::Class::Schema::Loader> |
16 | |
17 | =head1 DESCRIPTION |
18 | |
19 | This class builds relationships for L<DBIx::Class::Schema::Loader>. This |
20 | is module is not (yet) for external use. |
21 | |
22 | =head1 METHODS |
23 | |
24 | =head2 new |
25 | |
26 | Arguments: schema_class (scalar), fk_info (hashref), inflect_plural, inflect_singular |
27 | |
28 | C<$schema_class> should be a schema class name, where the source |
29 | classes have already been set up and registered. Column info, primary |
30 | key, and unique constraints will be drawn from this schema for all |
31 | of the existing source monikers. |
32 | |
33 | The fk_info hashref's contents should take the form: |
34 | |
35 | { |
36 | TableMoniker => [ |
37 | { |
38 | local_columns => [ 'col2', 'col3' ], |
39 | remote_columns => [ 'col5', 'col7' ], |
40 | remote_moniker => 'AnotherTableMoniker', |
41 | }, |
42 | # ... |
43 | ], |
44 | AnotherTableMoniker => [ |
45 | # ... |
46 | ], |
47 | # ... |
48 | } |
49 | |
50 | Options inflect_plural and inflect_singular are optional, and are better documented |
51 | in L<DBIx::Class::Schema::Loader::Base>. |
52 | |
53 | =head2 generate_code |
54 | |
55 | This method will return the generated relationships as a hashref per table moniker, |
56 | containing an arrayref of code strings which can be "eval"-ed in the context of |
57 | the source class, like: |
58 | |
59 | { |
60 | 'Some::Source::Class' => [ |
61 | "belongs_to( col1 => 'AnotherTableMoniker' )", |
62 | "has_many( anothers => 'AnotherTableMoniker', 'col15' )", |
63 | ], |
64 | 'Another::Source::Class' => [ |
65 | # ... |
66 | ], |
67 | # ... |
68 | } |
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69 | |
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70 | You might want to use this in building an on-disk source class file, by |
71 | adding each string to the appropriate source class file, |
72 | prefixed by C<__PACKAGE__-E<gt>>. |
73 | |
74 | =cut |
75 | |
76 | sub new { |
77 | my ( $class, $schema, $fk_info, $inflect_pl, $inflect_singular ) = @_; |
78 | |
79 | my $self = { |
80 | schema => $schema, |
81 | fk_info => $fk_info, |
82 | inflect_plural => $inflect_pl, |
83 | inflect_singular => $inflect_singular, |
84 | }; |
85 | |
86 | bless $self => $class; |
87 | |
88 | $self; |
89 | } |
90 | |
91 | |
92 | # pluralize a relationship name |
93 | sub _inflect_plural { |
94 | my ($self, $relname) = @_; |
95 | |
96 | if( ref $self->{inflect_plural} eq 'HASH' ) { |
97 | return $self->{inflect_plural}->{$relname} |
98 | if exists $self->{inflect_plural}->{$relname}; |
99 | } |
100 | elsif( ref $self->{inflect_plural} eq 'CODE' ) { |
101 | my $inflected = $self->{inflect_plural}->($relname); |
102 | return $inflected if $inflected; |
103 | } |
104 | |
105 | return $self->{legacy_default_inflections} |
106 | ? Lingua::EN::Inflect::PL($relname) |
107 | : Lingua::EN::Inflect::Number::to_PL($relname); |
108 | } |
109 | |
110 | # Singularize a relationship name |
111 | sub _inflect_singular { |
112 | my ($self, $relname) = @_; |
113 | |
114 | if( ref $self->{inflect_singular} eq 'HASH' ) { |
115 | return $self->{inflect_singular}->{$relname} |
116 | if exists $self->{inflect_singular}->{$relname}; |
117 | } |
118 | elsif( ref $self->{inflect_singular} eq 'CODE' ) { |
119 | my $inflected = $self->{inflect_singular}->($relname); |
120 | return $inflected if $inflected; |
121 | } |
122 | |
123 | return $self->{legacy_default_inflections} |
124 | ? $relname |
125 | : Lingua::EN::Inflect::Number::to_S($relname); |
126 | } |
127 | |
128 | sub generate_code { |
129 | my $self = shift; |
130 | |
131 | my $all_code = {}; |
132 | |
133 | foreach my $local_moniker (keys %{$self->{fk_info}}) { |
134 | my $local_table = $self->{schema}->source($local_moniker)->from; |
135 | my $local_class = $self->{schema}->class($local_moniker); |
136 | my $rels = $self->{fk_info}->{$local_moniker}; |
137 | |
138 | my %counters; |
139 | foreach my $rel (@$rels) { |
140 | next if !$rel->{remote_source}; |
141 | $counters{$rel->{remote_source}}++; |
142 | } |
143 | |
144 | foreach my $rel (@$rels) { |
145 | next if !$rel->{remote_source}; |
146 | my $local_cols = $rel->{local_columns}; |
147 | my $remote_cols = $rel->{remote_columns}; |
148 | my $remote_moniker = $rel->{remote_source}; |
149 | my $remote_obj = $self->{schema}->source($remote_moniker); |
150 | my $remote_class = $self->{schema}->class($remote_moniker); |
151 | my $remote_table = $remote_obj->from; |
152 | $remote_cols ||= [ $remote_obj->primary_columns ]; |
153 | |
154 | if($#$local_cols != $#$remote_cols) { |
155 | croak "Column count mismatch: $local_moniker (@$local_cols) " |
156 | . "$remote_moniker (@$remote_cols)"; |
157 | } |
158 | |
159 | my %cond; |
160 | foreach my $i (0 .. $#$local_cols) { |
161 | $cond{$remote_cols->[$i]} = $local_cols->[$i]; |
162 | } |
163 | |
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164 | my $local_relname; |
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165 | my $remote_relname; |
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166 | |
167 | # for single-column case, set the remote relname to the column |
168 | # name, to make filter accessors work |
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169 | if(scalar keys %cond == 1) { |
170 | my ($col) = keys %cond; |
171 | $remote_relname = $self->_inflect_singular($cond{$col}); |
172 | } |
173 | else { |
174 | $remote_relname = $self->_inflect_singular(lc $remote_table); |
175 | } |
176 | |
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177 | # If more than one rel between this pair of tables, use the local |
178 | # col names to distinguish |
179 | if($counters{$remote_moniker} > 1) { |
180 | my $colnames = q{_} . join(q{_}, @$local_cols); |
181 | $local_relname = $self->_inflect_plural( |
182 | lc($local_table) . $colnames |
183 | ); |
184 | $remote_relname .= $colnames if keys %cond > 1; |
185 | } else { |
186 | $local_relname = $self->_inflect_plural(lc $local_table); |
187 | } |
188 | |
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189 | my %rev_cond = reverse %cond; |
190 | |
191 | for (keys %rev_cond) { |
192 | $rev_cond{"foreign.$_"} = "self.".$rev_cond{$_}; |
193 | delete $rev_cond{$_}; |
194 | } |
195 | |
196 | push(@{$all_code->{$local_class}}, |
197 | { method => 'belongs_to', |
198 | args => [ $remote_relname, |
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199 | $remote_class, |
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200 | \%cond, |
201 | ], |
202 | } |
203 | ); |
204 | |
205 | push(@{$all_code->{$remote_class}}, |
206 | { method => 'has_many', |
207 | args => [ $local_relname, |
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208 | $local_class, |
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209 | \%rev_cond, |
210 | ], |
211 | } |
212 | ); |
213 | } |
214 | } |
215 | |
216 | return $all_code; |
217 | } |
218 | |
219 | 1; |