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1 | package DBIx::Class::Relationship::Base; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
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6 | use base qw/DBIx::Class/; |
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7 | |
8 | __PACKAGE__->mk_classdata('_relationships', { } ); |
9 | |
10 | =head1 NAME |
11 | |
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12 | DBIx::Class::Relationship::Base - Inter-table relationships |
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13 | |
14 | =head1 SYNOPSIS |
15 | |
16 | =head1 DESCRIPTION |
17 | |
18 | This class handles relationships between the tables in your database |
19 | model. It allows your to set up relationships, and to perform joins |
20 | on searches. |
21 | |
22 | =head1 METHODS |
23 | |
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24 | =head2 add_relationship |
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25 | |
26 | __PACKAGE__->add_relationship('relname', 'Foreign::Class', $cond, $attrs); |
27 | |
28 | The condition needs to be an SQL::Abstract-style representation of the |
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29 | join between the tables. For example, if you're creating a rel from Foo to Bar, |
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30 | |
31 | { 'foreign.foo_id' => 'self.id' } |
32 | |
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33 | will result in the JOIN clause |
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34 | |
35 | foo me JOIN bar bar ON bar.foo_id = me.id |
36 | |
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37 | You can specify as many foreign => self mappings as necessary. |
38 | |
39 | Valid attributes are as follows: |
40 | |
41 | =over 4 |
42 | |
43 | =item join_type |
44 | |
45 | Explicitly specifies the type of join to use in the relationship. Any SQL |
46 | join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in the SQL |
47 | command immediately before C<JOIN>. |
48 | |
49 | =item proxy |
50 | |
51 | An arrayref containing a list of accessors in the foreign class to proxy in |
52 | the main class. If, for example, you do the following: |
53 | |
54 | __PACKAGE__->might_have(bar => 'Bar', undef, { proxy => qw[/ margle /] }); |
55 | |
56 | Then, assuming Bar has an accessor named margle, you can do: |
57 | |
58 | my $obj = Foo->find(1); |
59 | $obj->margle(10); # set margle; Bar object is created if it doesn't exist |
60 | |
61 | =item accessor |
62 | |
63 | Specifies the type of accessor that should be created for the relationship. |
64 | Valid values are C<single> (for when there is only a single related object), |
65 | C<multi> (when there can be many), and C<filter> (for when there is a single |
66 | related object, but you also want the relationship accessor to double as |
67 | a column accessor). For C<multi> accessors, an add_to_* method is also |
68 | created, which calls C<create_related> for the relationship. |
69 | |
70 | =back |
71 | |
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72 | =cut |
73 | |
74 | sub add_relationship { |
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75 | shift->result_source->add_relationship(@_); |
76 | } |
77 | |
78 | sub relationships { |
79 | shift->result_source->relationships(@_); |
80 | } |
81 | |
82 | sub relationship_info { |
83 | shift->result_source->relationship_info(@_); |
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84 | } |
85 | |
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86 | sub resolve_condition { |
87 | my ($self, $cond, $attrs) = @_; |
88 | if (ref $cond eq 'HASH') { |
89 | my %ret; |
90 | foreach my $key (keys %$cond) { |
91 | my $val = $cond->{$key}; |
92 | if (ref $val) { |
93 | $self->throw("Can't handle this yet :("); |
94 | } else { |
95 | $ret{$self->_cond_key($attrs => $key)} |
96 | = $self->_cond_value($attrs => $key => $val); |
97 | } |
98 | } |
99 | return \%ret; |
100 | } else { |
101 | $self->throw("Can't handle this yet :("); |
102 | } |
103 | } |
104 | |
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105 | sub _cond_key { |
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106 | my ($self, $attrs, $key, $alias) = @_; |
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107 | my $action = $attrs->{_action} || ''; |
108 | if ($action eq 'convert') { |
109 | unless ($key =~ s/^foreign\.//) { |
110 | $self->throw("Unable to convert relationship to WHERE clause: invalid key ${key}"); |
111 | } |
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112 | if (defined (my $alias = $attrs->{_aliases}{foreign})) { |
113 | return "${alias}.${key}"; |
114 | } else { |
115 | return $key; |
116 | } |
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117 | } elsif ($action eq 'join') { |
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118 | return $key unless $key =~ /\./; |
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119 | my ($type, $field) = split(/\./, $key); |
120 | if (my $alias = $attrs->{_aliases}{$type}) { |
121 | my $class = $attrs->{_classes}{$alias}; |
122 | $self->throw("Unknown column $field on $class as $alias") |
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123 | unless $class->has_column($field); |
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124 | return join('.', $alias, $field); |
125 | } else { |
126 | $self->throw( "Unable to resolve type ${type}: only have aliases for ". |
127 | join(', ', keys %{$attrs->{_aliases} || {}}) ); |
128 | } |
129 | } |
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130 | return $self->next::method($attrs, $key); |
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131 | } |
132 | |
133 | sub _cond_value { |
134 | my ($self, $attrs, $key, $value) = @_; |
135 | my $action = $attrs->{_action} || ''; |
136 | if ($action eq 'convert') { |
137 | unless ($value =~ s/^self\.//) { |
138 | $self->throw( "Unable to convert relationship to WHERE clause: invalid value ${value}" ); |
139 | } |
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140 | unless ($self->has_column($value)) { |
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141 | $self->throw( "Unable to convert relationship to WHERE clause: no such accessor ${value}" ); |
142 | } |
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143 | return $self->get_column($value); |
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144 | } elsif ($action eq 'join') { |
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145 | return $key unless $key =~ /\./; |
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146 | my ($type, $field) = split(/\./, $value); |
147 | if (my $alias = $attrs->{_aliases}{$type}) { |
148 | my $class = $attrs->{_classes}{$alias}; |
149 | $self->throw("Unknown column $field on $class as $alias") |
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150 | unless $class->has_column($field); |
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151 | return join('.', $alias, $field); |
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152 | } else { |
153 | $self->throw( "Unable to resolve type ${type}: only have aliases for ". |
154 | join(', ', keys %{$attrs->{_aliases} || {}}) ); |
155 | } |
156 | } |
157 | |
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158 | return $self->next::method($attrs, $key, $value) |
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159 | } |
160 | |
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161 | =head2 search_related |
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162 | |
163 | My::Table->search_related('relname', $cond, $attrs); |
164 | |
165 | =cut |
166 | |
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167 | sub search_related { |
168 | my $self = shift; |
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169 | my $rel = shift; |
170 | my $attrs = { }; |
171 | if (@_ > 1 && ref $_[$#_] eq 'HASH') { |
172 | $attrs = { %{ pop(@_) } }; |
173 | } |
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174 | my $rel_obj = $self->relationship_info($rel); |
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175 | $self->throw( "No such relationship ${rel}" ) unless $rel_obj; |
176 | $attrs = { %{$rel_obj->{attrs} || {}}, %{$attrs || {}} }; |
177 | |
178 | $self->throw( "Invalid query: @_" ) if (@_ > 1 && (@_ % 2 == 1)); |
179 | my $query = ((@_ > 1) ? {@_} : shift); |
180 | |
181 | $attrs->{_action} = 'convert'; # shouldn't we resolve the cond to something |
182 | # to merge into the AST really? |
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183 | my ($cond) = $self->resolve_condition($rel_obj->{cond}, $attrs); |
184 | $query = ($query ? { '-and' => [ $cond, $query ] } : $cond); |
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185 | #use Data::Dumper; warn Dumper($query); |
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186 | #warn $rel_obj->{class}." $meth $cond ".join(', ', @{$attrs->{bind}||[]}); |
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187 | delete $attrs->{_action}; |
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188 | return $self->result_source->schema->resultset($rel_obj->{class} |
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189 | )->search($query, $attrs); |
190 | } |
191 | |
192 | =head2 count_related |
193 | |
194 | My::Table->count_related('relname', $cond, $attrs); |
195 | |
196 | =cut |
197 | |
198 | sub count_related { |
199 | my $self = shift; |
200 | return $self->search_related(@_)->count; |
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201 | } |
202 | |
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203 | =head2 create_related |
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204 | |
205 | My::Table->create_related('relname', \%col_data); |
206 | |
207 | =cut |
208 | |
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209 | sub create_related { |
210 | my $class = shift; |
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211 | my $rel = shift; |
212 | return $class->search_related($rel)->create(@_); |
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213 | } |
214 | |
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215 | =head2 new_related |
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216 | |
217 | My::Table->new_related('relname', \%col_data); |
218 | |
219 | =cut |
220 | |
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221 | sub new_related { |
222 | my ($self, $rel, $values, $attrs) = @_; |
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223 | return $self->search_related($rel)->new($values, $attrs); |
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224 | } |
225 | |
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226 | =head2 find_related |
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227 | |
228 | My::Table->find_related('relname', @pri_vals | \%pri_vals); |
229 | |
230 | =cut |
231 | |
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232 | sub find_related { |
233 | my $self = shift; |
234 | my $rel = shift; |
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235 | return $self->search_related($rel)->find(@_); |
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236 | } |
237 | |
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238 | =head2 find_or_create_related |
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239 | |
240 | My::Table->find_or_create_related('relname', \%col_data); |
241 | |
242 | =cut |
243 | |
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244 | sub find_or_create_related { |
245 | my $self = shift; |
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246 | return $self->find_related(@_) || $self->create_related(@_); |
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247 | } |
248 | |
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249 | =head2 set_from_related |
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250 | |
251 | My::Table->set_from_related('relname', $rel_obj); |
252 | |
253 | =cut |
254 | |
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255 | sub set_from_related { |
256 | my ($self, $rel, $f_obj) = @_; |
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257 | my $rel_obj = $self->relationship_info($rel); |
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258 | $self->throw( "No such relationship ${rel}" ) unless $rel_obj; |
259 | my $cond = $rel_obj->{cond}; |
260 | $self->throw( "set_from_related can only handle a hash condition; the " |
261 | ."condition for $rel is of type ".(ref $cond ? ref $cond : 'plain scalar')) |
262 | unless ref $cond eq 'HASH'; |
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263 | my $f_class = $self->result_source->schema->class($rel_obj->{class}); |
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264 | $self->throw( "Object $f_obj isn't a ".$f_class ) |
265 | unless $f_obj->isa($f_class); |
266 | foreach my $key (keys %$cond) { |
267 | next if ref $cond->{$key}; # Skip literals and complex conditions |
268 | $self->throw("set_from_related can't handle $key as key") |
269 | unless $key =~ m/^foreign\.([^\.]+)$/; |
270 | my $val = $f_obj->get_column($1); |
271 | $self->throw("set_from_related can't handle ".$cond->{$key}." as value") |
272 | unless $cond->{$key} =~ m/^self\.([^\.]+)$/; |
273 | $self->set_column($1 => $val); |
274 | } |
275 | return 1; |
276 | } |
277 | |
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278 | =head2 update_from_related |
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279 | |
280 | My::Table->update_from_related('relname', $rel_obj); |
281 | |
282 | =cut |
283 | |
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284 | sub update_from_related { |
285 | my $self = shift; |
286 | $self->set_from_related(@_); |
287 | $self->update; |
288 | } |
289 | |
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290 | =head2 delete_related |
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291 | |
292 | My::Table->delete_related('relname', $cond, $attrs); |
293 | |
294 | =cut |
295 | |
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296 | sub delete_related { |
297 | my $self = shift; |
298 | return $self->search_related(@_)->delete; |
299 | } |
300 | |
301 | 1; |
302 | |
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303 | =head1 AUTHORS |
304 | |
daec44b8 |
305 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
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306 | |
307 | =head1 LICENSE |
308 | |
309 | You may distribute this code under the same terms as Perl itself. |
310 | |
311 | =cut |
312 | |