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9c992ba1 |
1 | package DBIx::Class::ResultSource; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | use DBIx::Class::ResultSet; |
7 | |
8 | use Carp qw/croak/; |
9 | |
10 | use base qw/DBIx::Class/; |
11 | __PACKAGE__->load_components(qw/AccessorGroup/); |
12 | |
13 | __PACKAGE__->mk_group_accessors('simple' => |
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14 | qw/_ordered_columns _columns _primaries name resultset_class result_class schema from _relationships/); |
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15 | |
16 | =head1 NAME |
17 | |
18 | DBIx::Class::ResultSource - Result source object |
19 | |
20 | =head1 SYNOPSIS |
21 | |
22 | =head1 DESCRIPTION |
23 | |
24 | A ResultSource is a component of a schema from which results can be directly |
25 | retrieved, most usually a table (see L<DBIx::Class::ResultSource::Table>) |
26 | |
27 | =head1 METHODS |
28 | |
29 | =cut |
30 | |
31 | sub new { |
32 | my ($class, $attrs) = @_; |
33 | $class = ref $class if ref $class; |
34 | my $new = bless({ %{$attrs || {}} }, $class); |
35 | $new->{resultset_class} ||= 'DBIx::Class::ResultSet'; |
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36 | $new->{_ordered_columns} ||= []; |
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37 | $new->{_columns} ||= {}; |
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38 | $new->{_relationships} ||= {}; |
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39 | $new->{name} ||= "!!NAME NOT SET!!"; |
40 | return $new; |
41 | } |
42 | |
43 | sub add_columns { |
44 | my ($self, @cols) = @_; |
571dced3 |
45 | $self->_ordered_columns( \@cols ) |
46 | if !$self->_ordered_columns; |
20518cb4 |
47 | my @added; |
48 | my $columns = $self->_columns; |
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49 | while (my $col = shift @cols) { |
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50 | |
30126ac7 |
51 | my $column_info = ref $cols[0] ? shift(@cols) : {}; |
53509665 |
52 | # If next entry is { ... } use that for the column info, if not |
53 | # use an empty hashref |
54 | |
20518cb4 |
55 | push(@added, $col) unless exists $columns->{$col}; |
56 | |
57 | $columns->{$col} = $column_info; |
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58 | } |
20518cb4 |
59 | push @{ $self->_ordered_columns }, @added; |
30126ac7 |
60 | return $self; |
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61 | } |
62 | |
63 | *add_column = \&add_columns; |
64 | |
65 | =head2 add_columns |
66 | |
67 | $table->add_columns(qw/col1 col2 col3/); |
68 | |
69 | $table->add_columns('col1' => \%col1_info, 'col2' => \%col2_info, ...); |
70 | |
71 | Adds columns to the result source. If supplied key => hashref pairs uses |
72 | the hashref as the column_info for that column. |
73 | |
74 | =head2 add_column |
75 | |
76 | $table->add_column('col' => \%info?); |
77 | |
78 | Convenience alias to add_columns |
79 | |
80 | =cut |
81 | |
82 | sub resultset { |
83 | my $self = shift; |
84 | return $self->resultset_class->new($self); |
85 | } |
86 | |
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87 | =head2 has_column |
88 | |
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89 | if ($obj->has_column($col)) { ... } |
90 | |
91 | Returns 1 if the source has a column of this name, 0 otherwise. |
92 | |
93 | =cut |
94 | |
95 | sub has_column { |
96 | my ($self, $column) = @_; |
97 | return exists $self->_columns->{$column}; |
98 | } |
99 | |
100 | =head2 column_info |
101 | |
102 | my $info = $obj->column_info($col); |
103 | |
104 | Returns the column metadata hashref for a column. |
105 | |
106 | =cut |
107 | |
108 | sub column_info { |
109 | my ($self, $column) = @_; |
110 | croak "No such column $column" unless exists $self->_columns->{$column}; |
111 | return $self->_columns->{$column}; |
112 | } |
113 | |
114 | =head2 columns |
115 | |
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116 | my @column_names = $obj->columns; |
117 | |
118 | Returns all column names in the order they were declared to add_columns |
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119 | |
120 | =cut |
121 | |
122 | sub columns { |
123 | croak "columns() is a read-only accessor, did you mean add_columns()?" if (@_ > 1); |
571dced3 |
124 | return @{shift->{_ordered_columns}||[]}; |
125 | } |
126 | |
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127 | =head2 set_primary_key(@cols) |
128 | |
129 | Defines one or more columns as primary key for this source. Should be |
130 | called after C<add_columns>. |
131 | |
132 | =cut |
133 | |
134 | sub set_primary_key { |
135 | my ($self, @cols) = @_; |
136 | # check if primary key columns are valid columns |
137 | for (@cols) { |
138 | $self->throw("No such column $_ on table ".$self->name) |
139 | unless $self->has_column($_); |
140 | } |
141 | $self->_primaries(\@cols); |
142 | } |
143 | |
144 | =head2 primary_columns |
145 | |
146 | Read-only accessor which returns the list of primary keys. |
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147 | |
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148 | =cut |
149 | |
150 | sub primary_columns { |
151 | return @{shift->_primaries||[]}; |
152 | } |
153 | |
154 | =head2 from |
155 | |
156 | Returns an expression of the source to be supplied to storage to specify |
157 | retrieval from this source; in the case of a database the required FROM clause |
158 | contents. |
159 | |
160 | =cut |
161 | |
162 | =head2 storage |
163 | |
164 | Returns the storage handle for the current schema |
165 | |
166 | =cut |
167 | |
168 | sub storage { shift->schema->storage; } |
169 | |
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170 | =head2 add_relationship |
171 | |
172 | $source->add_relationship('relname', 'related_source', $cond, $attrs); |
173 | |
174 | The relation name can be arbitrary, but must be unique for each relationship |
175 | attached to this result source. 'related_source' should be the name with |
176 | which the related result source was registered with the current schema |
177 | (for simple schemas this is usally either Some::Namespace::Foo or just Foo) |
178 | |
179 | The condition needs to be an SQL::Abstract-style representation of the join |
180 | between the tables. For example, if you're creating a rel from Foo to Bar, |
181 | |
182 | { 'foreign.foo_id' => 'self.id' } |
183 | |
184 | will result in the JOIN clause |
185 | |
186 | foo me JOIN bar bar ON bar.foo_id = me.id |
187 | |
188 | You can specify as many foreign => self mappings as necessary. |
189 | |
190 | Valid attributes are as follows: |
191 | |
192 | =over 4 |
193 | |
194 | =item join_type |
195 | |
196 | Explicitly specifies the type of join to use in the relationship. Any SQL |
197 | join type is valid, e.g. C<LEFT> or C<RIGHT>. It will be placed in the SQL |
198 | command immediately before C<JOIN>. |
199 | |
200 | =item proxy |
201 | |
202 | An arrayref containing a list of accessors in the foreign class to proxy in |
203 | the main class. If, for example, you do the following: |
204 | |
205 | __PACKAGE__->might_have(bar => 'Bar', undef, { proxy => qw[/ margle /] }); |
206 | |
207 | Then, assuming Bar has an accessor named margle, you can do: |
208 | |
209 | my $obj = Foo->find(1); |
210 | $obj->margle(10); # set margle; Bar object is created if it doesn't exist |
211 | |
212 | =item accessor |
213 | |
214 | Specifies the type of accessor that should be created for the relationship. |
215 | Valid values are C<single> (for when there is only a single related object), |
216 | C<multi> (when there can be many), and C<filter> (for when there is a single |
217 | related object, but you also want the relationship accessor to double as |
218 | a column accessor). For C<multi> accessors, an add_to_* method is also |
219 | created, which calls C<create_related> for the relationship. |
220 | |
221 | =back |
222 | |
223 | =cut |
224 | |
225 | sub add_relationship { |
226 | my ($self, $rel, $f_source_name, $cond, $attrs) = @_; |
227 | die "Can't create relationship without join condition" unless $cond; |
228 | $attrs ||= {}; |
87772e46 |
229 | |
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230 | my %rels = %{ $self->_relationships }; |
231 | $rels{$rel} = { class => $f_source_name, |
87772e46 |
232 | source => $f_source_name, |
8452e496 |
233 | cond => $cond, |
234 | attrs => $attrs }; |
235 | $self->_relationships(\%rels); |
236 | |
30126ac7 |
237 | return $self; |
87772e46 |
238 | |
953a18ef |
239 | # XXX disabled. doesn't work properly currently. skip in tests. |
240 | |
8452e496 |
241 | my $f_source = $self->schema->source($f_source_name); |
242 | unless ($f_source) { |
243 | eval "require $f_source_name;"; |
244 | if ($@) { |
245 | die $@ unless $@ =~ /Can't locate/; |
246 | } |
247 | $f_source = $f_source_name->result_source; |
87772e46 |
248 | #my $s_class = ref($self->schema); |
249 | #$f_source_name =~ m/^${s_class}::(.*)$/; |
250 | #$self->schema->register_class(($1 || $f_source_name), $f_source_name); |
251 | #$f_source = $self->schema->source($f_source_name); |
8452e496 |
252 | } |
253 | return unless $f_source; # Can't test rel without f_source |
254 | |
255 | eval { $self->resolve_join($rel, 'me') }; |
256 | |
257 | if ($@) { # If the resolve failed, back out and re-throw the error |
258 | delete $rels{$rel}; # |
259 | $self->_relationships(\%rels); |
260 | die "Error creating relationship $rel: $@"; |
261 | } |
262 | 1; |
263 | } |
264 | |
265 | =head2 relationships() |
266 | |
267 | Returns all valid relationship names for this source |
268 | |
269 | =cut |
270 | |
271 | sub relationships { |
272 | return keys %{shift->_relationships}; |
273 | } |
274 | |
275 | =head2 relationship_info($relname) |
276 | |
277 | Returns the relationship information for the specified relationship name |
278 | |
279 | =cut |
280 | |
281 | sub relationship_info { |
282 | my ($self, $rel) = @_; |
283 | return $self->_relationships->{$rel}; |
284 | } |
285 | |
953a18ef |
286 | =head2 has_relationship($rel) |
287 | |
288 | Returns 1 if the source has a relationship of this name, 0 otherwise. |
289 | |
290 | =cut |
291 | |
292 | sub has_relationship { |
293 | my ($self, $rel) = @_; |
294 | return exists $self->_relationships->{$rel}; |
295 | } |
296 | |
8452e496 |
297 | =head2 resolve_join($relation) |
298 | |
299 | Returns the join structure required for the related result source |
300 | |
301 | =cut |
302 | |
303 | sub resolve_join { |
87772e46 |
304 | my ($self, $join, $alias) = @_; |
305 | if (ref $join eq 'ARRAY') { |
306 | return map { $self->resolve_join($_, $alias) } @$join; |
307 | } elsif (ref $join eq 'HASH') { |
308 | return map { $self->resolve_join($_, $alias), |
309 | $self->related_source($_)->resolve_join($join->{$_}, $_) } |
310 | keys %$join; |
311 | } elsif (ref $join) { |
312 | die("No idea how to resolve join reftype ".ref $join); |
313 | } else { |
3842b955 |
314 | my $rel_info = $self->relationship_info($join); |
315 | die("No such relationship ${join}") unless $rel_info; |
316 | my $type = $rel_info->{attrs}{join_type} || ''; |
953a18ef |
317 | return [ { $join => $self->related_source($join)->from, |
318 | -join_type => $type }, |
3842b955 |
319 | $self->resolve_condition($rel_info->{cond}, $join, $alias) ]; |
953a18ef |
320 | } |
321 | } |
322 | |
3842b955 |
323 | =head2 resolve_condition($cond, $rel, $alias|$object) |
953a18ef |
324 | |
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325 | Resolves the passed condition to a concrete query fragment. If given an alias, |
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326 | returns a join condition; if given an object, inverts that object to produce |
327 | a related conditional from that object. |
328 | |
329 | =cut |
330 | |
331 | sub resolve_condition { |
3842b955 |
332 | my ($self, $cond, $rel, $for) = @_; |
953a18ef |
333 | #warn %$cond; |
334 | if (ref $cond eq 'HASH') { |
335 | my %ret; |
336 | while (my ($k, $v) = each %{$cond}) { |
337 | # XXX should probably check these are valid columns |
3842b955 |
338 | $k =~ s/^foreign\.// || die "Invalid rel cond key ${k}"; |
339 | $v =~ s/^self\.// || die "Invalid rel cond val ${v}"; |
953a18ef |
340 | if (ref $for) { # Object |
3842b955 |
341 | #warn "$self $k $for $v"; |
342 | $ret{$k} = $for->get_column($v); |
343 | #warn %ret; |
953a18ef |
344 | } else { |
3842b955 |
345 | $ret{"${rel}.${k}"} = "${for}.${v}"; |
953a18ef |
346 | } |
953a18ef |
347 | } |
348 | return \%ret; |
5efe4c79 |
349 | } elsif (ref $cond eq 'ARRAY') { |
350 | return [ map { $self->resolve_condition($_, $rel, $for) } @$cond ]; |
953a18ef |
351 | } else { |
352 | die("Can't handle this yet :("); |
87772e46 |
353 | } |
354 | } |
355 | |
953a18ef |
356 | |
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357 | =head2 related_source($relname) |
358 | |
359 | Returns the result source for the given relationship |
360 | |
361 | =cut |
362 | |
363 | sub related_source { |
364 | my ($self, $rel) = @_; |
365 | return $self->schema->source($self->relationship_info($rel)->{source}); |
8452e496 |
366 | } |
367 | |
9c992ba1 |
368 | 1; |
369 | |
370 | =head1 AUTHORS |
371 | |
372 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
373 | |
374 | =head1 LICENSE |
375 | |
376 | You may distribute this code under the same terms as Perl itself. |
377 | |
378 | =cut |
379 | |