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1 | package DBIx::Class::Schema; |
2 | |
3 | use strict; |
4 | use warnings; |
63e9583a |
5 | use DBIx::Class::DB; |
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6 | |
41a6f8c0 |
7 | use base qw/DBIx::Class/; |
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8 | |
42a1aaa1 |
9 | __PACKAGE__->load_components(qw/Exception/); |
74b92d9a |
10 | __PACKAGE__->mk_classdata('class_registrations' => {}); |
d7156e50 |
11 | __PACKAGE__->mk_classdata('storage_type' => 'DBI'); |
12 | __PACKAGE__->mk_classdata('storage'); |
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13 | |
c2da098a |
14 | =head1 NAME |
15 | |
16 | DBIx::Class::Schema - composable schemas |
17 | |
18 | =head1 SYNOPSIS |
19 | |
03312470 |
20 | in My/Schema.pm |
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21 | |
22 | package My::Schema; |
23 | |
24 | use base qw/DBIx::Class::Schema/; |
25 | |
26 | __PACKAGE__->load_classes(qw/Foo Bar Baz/); |
27 | |
03312470 |
28 | in My/Schema/Foo.pm |
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29 | |
30 | package My::Schema::Foo; |
31 | |
03312470 |
32 | use base qw/DBIx::Class/; |
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33 | |
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34 | __PACKAGE__->load_components(qw/PK::Auto::Pg Core/); # for example |
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35 | __PACKAGE__->table('foo'); |
36 | ... |
37 | |
03312470 |
38 | in My/DB.pm |
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39 | |
40 | use My::Schema; |
41 | |
42 | My::Schema->compose_connection('My::DB', $dsn, $user, $pass, $attrs); |
43 | |
03312470 |
44 | then in app code |
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45 | |
656796f2 |
46 | my @obj = My::DB::Foo->search({}); # My::DB::Foo isa My::Schema::Foo My::DB |
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47 | |
48 | =head1 DESCRIPTION |
49 | |
429bd4f1 |
50 | Creates database classes based on a schema. This allows you to have more than |
51 | one concurrent connection using the same database classes, by making |
52 | subclasses under a new namespace for each connection. If you only need one |
53 | class, you should probably use L<DBIx::Class::DB> directly instead. |
54 | |
03312470 |
55 | NB: If you're used to L<Class::DBI> it's worth reading the L</SYNOPSIS> |
56 | carefully as DBIx::Class does things a little differently. Note in |
57 | particular which module inherits off which. |
58 | |
c2da098a |
59 | =head1 METHODS |
60 | |
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61 | =head2 register_class <component> <component_class> |
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62 | |
63 | Registers the class in the schema's class_registrations. This is a hash |
429bd4f1 |
64 | containing database classes, keyed by their monikers. It's used by |
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65 | compose_connection to create/modify all the existing database classes. |
66 | |
c2da098a |
67 | =cut |
68 | |
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69 | sub register_class { |
7fb16f1a |
70 | my ($self, $name, $to_register) = @_; |
71 | my %reg = %{$self->class_registrations}; |
a02675cd |
72 | $reg{$name} = $to_register; |
7fb16f1a |
73 | $self->class_registrations(\%reg); |
74 | $to_register->result_source->schema($self); |
74b92d9a |
75 | } |
76 | |
130c6439 |
77 | =head2 registered_classes |
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78 | |
79 | Simple read-only accessor for the schema's registered classes. See |
80 | register_class above if you want to modify it. |
81 | |
82 | |
83 | =cut |
84 | |
74b92d9a |
85 | sub registered_classes { |
86 | return values %{shift->class_registrations}; |
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87 | } |
88 | |
bfb2bd4f |
89 | =head2 class |
90 | |
91 | my $class = $schema->class('Foo'); |
92 | |
93 | Shortcut to retrieve a single class by its registered name |
94 | |
95 | =cut |
96 | |
97 | sub class { |
98 | my ($self, $class) = @_; |
99 | return $self->class_registrations->{$class}; |
100 | } |
101 | |
ea20d0fd |
102 | =head2 source |
103 | |
104 | my $source = $schema->source('Foo'); |
105 | |
106 | Returns the result source object for the registered name |
107 | |
108 | =cut |
109 | |
110 | sub source { |
111 | my ($self, $class) = @_; |
112 | return $self->class_registrations->{$class}->result_source; |
113 | } |
114 | |
115 | =head2 resultset |
116 | |
117 | my $rs = $schema->resultset('Foo'); |
118 | |
119 | Returns the resultset for the registered name |
120 | |
121 | =cut |
122 | |
123 | sub resultset { |
124 | my ($self, $class) = @_; |
125 | return $self->class_registrations->{$class}->result_source->resultset; |
126 | } |
127 | |
128 | |
130c6439 |
129 | =head2 load_classes [<classes>, (<class>, <class>), {<namespace> => [<classes>]}] |
076652e8 |
130 | |
429bd4f1 |
131 | Uses L<Module::Find> to find all classes under the database class' namespace, |
132 | or uses the classes you select. Then it loads the component (using L<use>), |
133 | and registers them (using B<register_class>); |
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134 | |
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135 | It is possible to comment out classes with a leading '#', but note that perl |
136 | will think it's a mistake (trying to use a comment in a qw list) so you'll |
137 | need to add "no warnings 'qw';" before your load_classes call. |
138 | |
076652e8 |
139 | =cut |
140 | |
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141 | sub load_classes { |
5ce32fc1 |
142 | my ($class, @params) = @_; |
143 | |
144 | my %comps_for; |
145 | |
146 | if (@params) { |
147 | foreach my $param (@params) { |
148 | if (ref $param eq 'ARRAY') { |
149 | # filter out commented entries |
150 | my @modules = grep { $_ !~ /^#/ } @$param; |
151 | |
152 | push (@{$comps_for{$class}}, @modules); |
153 | } |
154 | elsif (ref $param eq 'HASH') { |
155 | # more than one namespace possible |
156 | for my $comp ( keys %$param ) { |
157 | # filter out commented entries |
158 | my @modules = grep { $_ !~ /^#/ } @{$param->{$comp}}; |
159 | |
160 | push (@{$comps_for{$comp}}, @modules); |
161 | } |
162 | } |
163 | else { |
164 | # filter out commented entries |
165 | push (@{$comps_for{$class}}, $param) if $param !~ /^#/; |
166 | } |
167 | } |
168 | } else { |
41a6f8c0 |
169 | eval "require Module::Find;"; |
170 | $class->throw("No arguments to load_classes and couldn't load". |
171 | " Module::Find ($@)") if $@; |
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172 | my @comp = map { substr $_, length "${class}::" } Module::Find::findallmod($class); |
173 | $comps_for{$class} = \@comp; |
41a6f8c0 |
174 | } |
5ce32fc1 |
175 | |
176 | foreach my $prefix (keys %comps_for) { |
177 | foreach my $comp (@{$comps_for{$prefix}||[]}) { |
178 | my $comp_class = "${prefix}::${comp}"; |
5ce32fc1 |
179 | eval "use $comp_class"; # If it fails, assume the user fixed it |
bfb2bd4f |
180 | if ($@) { |
181 | die $@ unless $@ =~ /Can't locate/; |
182 | } |
5ce32fc1 |
183 | $class->register_class($comp => $comp_class); |
184 | } |
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185 | } |
186 | } |
187 | |
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188 | =head2 compose_connection <target> <@db_info> |
429bd4f1 |
189 | |
190 | This is the most important method in this class. it takes a target namespace, |
191 | as well as dbh connection info, and creates a L<DBIx::Class::DB> class as |
192 | well as subclasses for each of your database classes in this namespace, using |
193 | this connection. |
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194 | |
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195 | It will also setup a ->class method on the target class, which lets you |
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196 | resolve database classes based on the schema component name, for example |
197 | |
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198 | MyApp::DB->class('Foo') # returns MyApp::DB::Foo, |
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199 | # which ISA MyApp::Schema::Foo |
200 | |
201 | This is the recommended API for accessing Schema generated classes, and |
202 | using it might give you instant advantages with future versions of DBIC. |
203 | |
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204 | WARNING: Loading components into Schema classes after compose_connection |
205 | may not cause them to be seen by the classes in your target namespace due |
206 | to the dispatch table approach used by Class::C3. If you do this you may find |
207 | you need to call Class::C3->reinitialize() afterwards to get the behaviour |
208 | you expect. |
209 | |
076652e8 |
210 | =cut |
211 | |
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212 | sub compose_connection { |
ea20d0fd |
213 | my ($self, $target, @info) = @_; |
11b78bd6 |
214 | my $conn_class = "${target}::_db"; |
ea20d0fd |
215 | $self->setup_connection_class($conn_class, @info); |
216 | my $schema = $self->compose_namespace($target, $conn_class); |
bfb2bd4f |
217 | $schema->storage($conn_class->storage); |
218 | foreach my $class ($schema->registered_classes) { |
219 | my $source = $class->result_source; |
220 | $source = $source->new($source); |
221 | $source->schema($schema); |
222 | $source->result_class($class); |
223 | $class->mk_classdata(result_source => $source); |
ea20d0fd |
224 | $class->mk_classdata(resultset_instance => $source->resultset); |
bfb2bd4f |
225 | } |
226 | return $schema; |
e678398e |
227 | } |
228 | |
229 | sub compose_namespace { |
230 | my ($class, $target, $base) = @_; |
74b92d9a |
231 | my %reg = %{ $class->class_registrations }; |
11b78bd6 |
232 | my %target; |
233 | my %map; |
bfb2bd4f |
234 | my $schema = bless({ }, $class); |
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235 | while (my ($comp, $comp_class) = each %reg) { |
236 | my $target_class = "${target}::${comp}"; |
ea20d0fd |
237 | $class->inject_base($target_class, $comp_class, ($base ? $base : ())); |
11b78bd6 |
238 | @map{$comp, $comp_class} = ($target_class, $target_class); |
b7951443 |
239 | } |
bfb2bd4f |
240 | $schema->class_registrations(\%map); |
11b78bd6 |
241 | { |
242 | no strict 'refs'; |
bfb2bd4f |
243 | *{"${target}::schema"} = |
244 | sub { $schema }; |
11b78bd6 |
245 | *{"${target}::class"} = |
bfb2bd4f |
246 | sub { shift->schema->class(@_) }; |
11b78bd6 |
247 | } |
e678398e |
248 | $base->class_resolver($target); |
bfb2bd4f |
249 | return $schema; |
b7951443 |
250 | } |
251 | |
130c6439 |
252 | =head2 setup_connection_class <$target> <@info> |
076652e8 |
253 | |
429bd4f1 |
254 | Sets up a database connection class to inject between the schema |
255 | and the subclasses the schema creates. |
256 | |
076652e8 |
257 | =cut |
258 | |
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259 | sub setup_connection_class { |
260 | my ($class, $target, @info) = @_; |
63e9583a |
261 | $class->inject_base($target => 'DBIx::Class::DB'); |
262 | #$target->load_components('DB'); |
b7951443 |
263 | $target->connection(@info); |
264 | } |
265 | |
a02675cd |
266 | 1; |
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267 | |
c2da098a |
268 | =head1 AUTHORS |
269 | |
daec44b8 |
270 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
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271 | |
272 | =head1 LICENSE |
273 | |
274 | You may distribute this code under the same terms as Perl itself. |
275 | |
276 | =cut |
277 | |