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