1 package SQL::Translator::Parser::DBIx::Class;
3 # AUTHOR: Jess Robinson
5 # Some mistakes the fault of Matt S Trout
7 # Others the fault of Ash Berlin
11 our ($DEBUG, $VERSION, @EXPORT_OK);
13 $DEBUG = 0 unless defined $DEBUG;
16 use SQL::Translator::Utils qw(debug normalize_name);
17 use DBIx::Class::Carp qw/^SQL::Translator|^DBIx::Class|^Try::Tiny/;
18 use DBIx::Class::Exception;
19 use Scalar::Util 'blessed';
23 use base qw(Exporter);
25 @EXPORT_OK = qw(parse);
27 # -------------------------------------------------------------------
30 # setting parser_args => { add_fk_index => 0 } will prevent
31 # the auto-generation of an index for each FK.
33 # Note that $data, in the case of this parser, is not useful.
34 # We're working with DBIx::Class Schemas, not data streams.
35 # -------------------------------------------------------------------
38 my $args = $tr->parser_args;
39 my $dbicschema = $args->{'DBIx::Class::Schema'} || $args->{"DBIx::Schema"} ||$data;
40 $dbicschema ||= $args->{'package'};
41 my $limit_sources = $args->{'sources'};
43 DBIx::Class::Exception->throw('No DBIx::Class::Schema') unless ($dbicschema);
44 if (!ref $dbicschema) {
45 eval "require $dbicschema"
46 or DBIx::Class::Exception->throw("Can't load $dbicschema: $@");
49 my $schema = $tr->schema;
52 $schema->name( ref($dbicschema) . " v" . ($dbicschema->schema_version || '1.x'))
53 unless ($schema->name);
55 my @monikers = sort $dbicschema->sources;
57 my $ref = ref $limit_sources || '';
58 $dbicschema->throw_exception ("'sources' parameter must be an array or hash ref")
59 unless( $ref eq 'ARRAY' || ref eq 'HASH' );
61 # limit monikers to those specified in
63 if ($ref eq 'ARRAY') {
64 $sources->{$_} = 1 for (@$limit_sources);
66 $sources = $limit_sources;
68 @monikers = grep { $sources->{$_} } @monikers;
72 my(%table_monikers, %view_monikers);
73 for my $moniker (@monikers){
74 my $source = $dbicschema->source($moniker);
75 if ( $source->isa('DBIx::Class::ResultSource::Table') ) {
76 $table_monikers{$moniker}++;
77 } elsif( $source->isa('DBIx::Class::ResultSource::View') ){
78 next if $source->is_virtual;
79 $view_monikers{$moniker}++;
84 foreach my $moniker (sort keys %table_monikers)
86 my $source = $dbicschema->source($moniker);
87 my $table_name = $source->name;
89 # FIXME - this isn't the right way to do it, but sqlt does not
90 # support quoting properly to be signaled about this
91 $table_name = $$table_name if ref $table_name eq 'SCALAR';
93 # It's possible to have multiple DBIC sources using the same table
94 next if $tables{$table_name};
96 $tables{$table_name}{source} = $source;
97 my $table = $tables{$table_name}{object} = SQL::Translator::Schema::Table->new(
101 foreach my $col ($source->columns)
103 # assuming column_info in dbic is the same as DBI (?)
104 # data_type is a number, column_type is text?
108 is_auto_increment => 0,
111 %{$source->column_info($col)}
113 if ($colinfo{is_nullable}) {
114 $colinfo{default} = '' unless exists $colinfo{default};
116 my $f = $table->add_field(%colinfo)
117 || $dbicschema->throw_exception ($table->error);
120 my @primary = $source->primary_columns;
122 $table->primary_key(@primary) if @primary;
124 my %unique_constraints = $source->unique_constraints;
125 foreach my $uniq (sort keys %unique_constraints) {
126 if (!$source->_compare_relationship_keys($unique_constraints{$uniq}, \@primary)) {
127 $table->add_constraint(
130 fields => $unique_constraints{$uniq}
135 my @rels = $source->relationships();
139 # global add_fk_index set in parser_args
140 my $add_fk_index = (exists $args->{add_fk_index} && ! $args->{add_fk_index}) ? 0 : 1;
142 foreach my $rel (sort @rels)
145 my $rel_info = $source->relationship_info($rel);
147 # Ignore any rel cond that isn't a straight hash
148 next unless ref $rel_info->{cond} eq 'HASH';
150 my $relsource = try { $source->related_source($rel) };
151 unless ($relsource) {
152 carp "Ignoring relationship '$rel' - related resultsource '$rel_info->{class}' is not registered with this schema\n";
156 # related sources might be excluded via a {sources} filter or might be views
157 next unless exists $table_monikers{$relsource->source_name};
159 my $rel_table = $relsource->name;
161 # FIXME - this isn't the right way to do it, but sqlt does not
162 # support quoting properly to be signaled about this
163 $rel_table = $$rel_table if ref $rel_table eq 'SCALAR';
165 my $reverse_rels = $source->reverse_relationship_info($rel);
166 my ($otherrelname, $otherrelationship) = each %{$reverse_rels};
168 # Force the order of @cond to match the order of ->add_columns
170 my %other_columns_idx = map {'foreign.'.$_ => ++$idx } $relsource->columns;
171 my @cond = sort { $other_columns_idx{$a} cmp $other_columns_idx{$b} } keys(%{$rel_info->{cond}});
173 # Get the key information, mapping off the foreign/self markers
174 my @refkeys = map {/^\w+\.(\w+)$/} @cond;
175 my @keys = map {$rel_info->{cond}->{$_} =~ /^\w+\.(\w+)$/} @cond;
177 # determine if this relationship is a self.fk => foreign.pk (i.e. belongs_to)
180 #first it can be specified explicitly
181 if ( exists $rel_info->{attrs}{is_foreign_key_constraint} ) {
182 $fk_constraint = $rel_info->{attrs}{is_foreign_key_constraint};
184 # it can not be multi
185 elsif ( $rel_info->{attrs}{accessor}
186 && $rel_info->{attrs}{accessor} eq 'multi' ) {
189 # if indeed single, check if all self.columns are our primary keys.
190 # this is supposed to indicate a has_one/might_have...
191 # where's the introspection!!?? :)
193 $fk_constraint = not $source->_compare_relationship_keys(\@keys, \@primary);
197 for my $c (qw/delete update/) {
198 if (exists $rel_info->{attrs}{"on_$c"}) {
199 if ($fk_constraint) {
200 $cascade->{$c} = $rel_info->{attrs}{"on_$c"};
202 elsif ( $rel_info->{attrs}{"on_$c"} ) {
203 carp "SQLT attribute 'on_$c' was supplied for relationship '$moniker/$rel', which does not appear to be a foreign constraint. "
204 . "If you are sure that SQLT must generate a constraint for this relationship, add 'is_foreign_key_constraint => 1' to the attributes.\n";
207 elsif (defined $otherrelationship and $otherrelationship->{attrs}{$c eq 'update' ? 'cascade_copy' : 'cascade_delete'}) {
208 $cascade->{$c} = 'CASCADE';
213 # Constraints are added only if applicable
214 next unless $fk_constraint;
216 # Make sure we dont create the same foreign key constraint twice
217 my $key_test = join("\x00", sort @keys);
218 next if $created_FK_rels{$rel_table}->{$key_test};
221 $created_FK_rels{$rel_table}->{$key_test} = 1;
223 my $is_deferrable = $rel_info->{attrs}{is_deferrable};
225 # calculate dependencies: do not consider deferrable constraints and
226 # self-references for dependency calculations
227 if (! $is_deferrable and $rel_table ne $table_name) {
228 $tables{$table_name}{foreign_table_deps}{$rel_table}++;
231 $table->add_constraint(
232 type => 'foreign_key',
233 name => join('_', $table_name, 'fk', @keys),
235 reference_fields => \@refkeys,
236 reference_table => $rel_table,
237 on_delete => uc ($cascade->{delete} || ''),
238 on_update => uc ($cascade->{update} || ''),
239 (defined $is_deferrable ? ( deferrable => $is_deferrable ) : ()),
242 # global parser_args add_fk_index param can be overridden on the rel def
243 my $add_fk_index_rel = (exists $rel_info->{attrs}{add_fk_index}) ? $rel_info->{attrs}{add_fk_index} : $add_fk_index;
245 # Check that we do not create an index identical to the PK index
246 # (some RDBMS croak on this, and it generally doesn't make much sense)
247 # NOTE: we do not sort the key columns because the order of
248 # columns is important for indexes and two indexes with the
249 # same cols but different order are allowed and sometimes
251 next if join("\x00", @keys) eq join("\x00", @primary);
253 if ($add_fk_index_rel) {
254 my $index = $table->add_index(
255 name => join('_', $table_name, 'idx', @keys),
266 # attach the tables to the schema in dependency order
268 map { $_ => _resolve_deps ($_, \%tables) } (keys %tables)
273 keys %{$dependencies->{$a} || {} } <=> keys %{ $dependencies->{$b} || {} }
279 $schema->add_table ($tables{$table}{object});
280 $tables{$table}{source} -> _invoke_sqlt_deploy_hook( $tables{$table}{object} );
282 # the hook might have already removed the table
283 if ($schema->get_table($table) && $table =~ /^ \s* \( \s* SELECT \s+/ix) {
286 Custom SQL through ->name(\'( SELECT ...') is DEPRECATED, for more details see
287 "Arbitrary SQL through a custom ResultSource" in DBIx::Class::Manual::Cookbook
288 or http://search.cpan.org/dist/DBIx-Class/lib/DBIx/Class/Manual/Cookbook.pod
292 # remove the table as there is no way someone might want to
293 # actually deploy this
294 $schema->drop_table ($table);
299 my @views = map { $dbicschema->source($_) } keys %view_monikers;
301 my $view_dependencies = {
303 $_ => _resolve_deps( $dbicschema->source($_), \%view_monikers )
304 } ( keys %view_monikers )
309 keys %{ $view_dependencies->{ $a->source_name } || {} } <=>
310 keys %{ $view_dependencies->{ $b->source_name } || {} }
311 || $a->source_name cmp $b->source_name
313 map { $dbicschema->source($_) }
316 foreach my $source (@view_sources)
318 my $view_name = $source->name;
320 # FIXME - this isn't the right way to do it, but sqlt does not
321 # support quoting properly to be signaled about this
322 $view_name = $$view_name if ref $view_name eq 'SCALAR';
324 # Skip custom query sources
325 next if ref $view_name;
327 # Its possible to have multiple DBIC source using same table
328 next if $views{$view_name}++;
330 $dbicschema->throw_exception ("view $view_name is missing a view_definition")
331 unless $source->view_definition;
333 my $view = $schema->add_view (
335 fields => [ $source->columns ],
336 $source->view_definition ? ( 'sql' => $source->view_definition ) : ()
337 ) || $dbicschema->throw_exception ($schema->error);
339 $source->_invoke_sqlt_deploy_hook($view);
343 if ($dbicschema->can('sqlt_deploy_hook')) {
344 $dbicschema->sqlt_deploy_hook($schema);
351 # Quick and dirty dependency graph calculator
354 my ( $question, $answers, $seen ) = @_;
359 # copy and bump all deps by one (so we can reconstruct the chain)
360 my %seen = map { $_ => $seen->{$_} + 1 } ( keys %$seen );
361 if ( blessed($question)
362 && $question->isa('DBIx::Class::ResultSource::View') )
364 $seen{ $question->result_class } = 1;
365 @deps = keys %{ $question->{deploy_depends_on} };
368 $seen{$question} = 1;
369 @deps = keys %{ $answers->{$question}{foreign_table_deps} };
372 for my $dep (@deps) {
373 if ( $seen->{$dep} ) {
378 if ( blessed($question)
379 && $question->isa('DBIx::Class::ResultSource::View') )
381 no warnings 'uninitialized';
382 my ($next_dep_source_name) =
384 $question->schema->source($_)->result_class eq $dep
385 && !( $question->schema->source($_)
386 ->isa('DBIx::Class::ResultSource::Table') )
387 } @{ [ $question->schema->sources ] };
388 return {} unless $next_dep_source_name;
389 $next_dep = $question->schema->source($next_dep_source_name);
394 my $subdeps = _resolve_deps( $next_dep, $answers, \%seen );
395 $ret->{$_} += $subdeps->{$_} for ( keys %$subdeps );
405 SQL::Translator::Parser::DBIx::Class - Create a SQL::Translator schema
406 from a DBIx::Class::Schema instance
412 my $schema = MyApp::Schema->connect("dbi:SQLite:something.db");
413 $schema->create_ddl_dir();
421 my $schema = MyApp::Schema->connect;
422 my $trans = SQL::Translator->new (
423 parser => 'SQL::Translator::Parser::DBIx::Class',
432 producer => 'SQLite',
433 ) or die SQL::Translator->error;
434 my $out = $trans->translate() or die $trans->error;
438 This class requires L<SQL::Translator> installed to work.
440 C<SQL::Translator::Parser::DBIx::Class> reads a DBIx::Class schema,
441 interrogates the columns, and stuffs it all in an $sqlt_schema object.
443 Its primary use is in deploying database layouts described as a set
444 of L<DBIx::Class> classes, to a database. To do this, see
445 L<DBIx::Class::Schema/deploy>.
447 This can also be achieved by having DBIx::Class export the schema as a
448 set of SQL files ready for import into your database, or passed to
449 other machines that need to have your application installed but don't
450 have SQL::Translator installed. To do this see
451 L<DBIx::Class::Schema/create_ddl_dir>.
453 =head1 PARSER OPTIONS
457 Create an index for each foreign key.
458 Enabled by default, as having indexed foreign key columns is normally the
459 sensible thing to do.
465 =item Arguments: \@class_names
469 Limit the amount of parsed sources by supplying an explicit list of source names.
473 L<SQL::Translator>, L<DBIx::Class::Schema>
477 See L<DBIx::Class/CONTRIBUTORS>.
481 You may distribute this code under the same terms as Perl itself.