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::_Util 'dbic_internal_try';
19 use DBIx::Class::Exception;
20 use Class::C3::Componentised;
21 use Scalar::Util 'blessed';
25 use base qw(Exporter);
27 @EXPORT_OK = qw(parse);
29 # -------------------------------------------------------------------
32 # setting parser_args => { add_fk_index => 0 } will prevent
33 # the auto-generation of an index for each FK.
35 # Note that $data, in the case of this parser, is not useful.
36 # We're working with DBIx::Class Schemas, not data streams.
37 # -------------------------------------------------------------------
40 my $args = $tr->parser_args;
42 my $dbicschema = $data || $args->{dbic_schema};
44 for (qw(DBIx::Class::Schema DBIx::Schema package)) {
45 if (defined (my $s = delete $args->{$_} )) {
46 carp_unique("Supplying a schema via ... parser_args => { '$_' => \$schema } is deprecated. Please use parser_args => { dbic_schema => \$schema } instead");
48 # move it from the deprecated to the proper $args slot
49 unless ($dbicschema) {
50 $args->{dbic_schema} = $dbicschema = $s;
55 DBIx::Class::Exception->throw('No DBIx::Class::Schema') unless ($dbicschema);
57 if (!ref $dbicschema) {
59 Class::C3::Componentised->ensure_class_loaded($dbicschema)
61 DBIx::Class::Exception->throw("Can't load $dbicschema: $_");
66 ref $args->{dbic_schema}
68 $args->{dbic_schema}->storage
70 # we have a storage-holding $schema instance in $args
71 # we need to dissociate it from that $storage
72 # otherwise SQLT insanity may ensue due to how some
73 # serializing producers treat $args (crazy crazy shit)
74 local $args->{dbic_schema}{storage};
75 $args->{dbic_schema} = $args->{dbic_schema}->clone;
78 my $schema = $tr->schema;
81 $schema->name( ref($dbicschema) . " v" . ($dbicschema->schema_version || '1.x'))
82 unless ($schema->name);
84 my @monikers = sort $dbicschema->sources;
85 if (my $limit_sources = $args->{'sources'}) {
86 my $ref = ref $limit_sources || '';
87 $dbicschema->throw_exception ("'sources' parameter must be an array or hash ref")
88 unless( $ref eq 'ARRAY' || ref eq 'HASH' );
90 # limit monikers to those specified in
92 if ($ref eq 'ARRAY') {
93 $sources->{$_} = 1 for (@$limit_sources);
95 $sources = $limit_sources;
97 @monikers = grep { $sources->{$_} } @monikers;
101 my(%table_monikers, %view_monikers);
102 for my $moniker (@monikers){
103 my $source = $dbicschema->source($moniker);
104 if ( $source->isa('DBIx::Class::ResultSource::Table') ) {
105 $table_monikers{$moniker}++;
106 } elsif( $source->isa('DBIx::Class::ResultSource::View') ){
107 next if $source->is_virtual;
108 $view_monikers{$moniker}++;
113 foreach my $moniker (sort keys %table_monikers)
115 my $source = $dbicschema->source($moniker);
116 my $table_name = $source->name;
118 # FIXME - this isn't the right way to do it, but sqlt does not
119 # support quoting properly to be signaled about this
120 $table_name = $$table_name if ref $table_name eq 'SCALAR';
122 # It's possible to have multiple DBIC sources using the same table
123 next if $tables{$table_name};
125 $tables{$table_name}{source} = $source;
126 my $table = $tables{$table_name}{object} = SQL::Translator::Schema::Table->new(
131 my $ci = $source->columns_info;
133 # same order as add_columns
134 foreach my $col ($source->columns)
136 # assuming column_info in dbic is the same as DBI (?)
137 # data_type is a number, column_type is text?
141 is_auto_increment => 0,
146 if ($colinfo{is_nullable}) {
147 $colinfo{default} = '' unless exists $colinfo{default};
149 my $f = $table->add_field(%colinfo)
150 || $dbicschema->throw_exception ($table->error);
153 my @primary = $source->primary_columns;
155 $table->primary_key(@primary) if @primary;
157 my %unique_constraints = $source->unique_constraints;
158 foreach my $uniq (sort keys %unique_constraints) {
159 if (!$source->_compare_relationship_keys($unique_constraints{$uniq}, \@primary)) {
160 $table->add_constraint(
163 fields => $unique_constraints{$uniq}
168 my @rels = $source->relationships();
172 # global add_fk_index set in parser_args
173 my $add_fk_index = (exists $args->{add_fk_index} && ! $args->{add_fk_index}) ? 0 : 1;
176 foreach my $rel (sort @rels) {
178 my $rel_info = $source->relationship_info($rel);
180 # Ignore any rel cond that isn't a straight hash
181 next unless ref $rel_info->{cond} eq 'HASH';
183 my $relsource = dbic_internal_try { $source->related_source($rel) };
184 unless ($relsource) {
185 carp "Ignoring relationship '$rel' on '$moniker' - related resultsource '$rel_info->{class}' is not registered with this schema\n";
189 # related sources might be excluded via a {sources} filter or might be views
190 next unless exists $table_monikers{$relsource->source_name};
192 my $rel_table = $relsource->name;
194 # FIXME - this isn't the right way to do it, but sqlt does not
195 # support quoting properly to be signaled about this
196 $rel_table = $$rel_table if ref $rel_table eq 'SCALAR';
198 # Force the order of @cond to match the order of ->add_columns
200 my %other_columns_idx = map {'foreign.'.$_ => ++$idx } $relsource->columns;
202 for ( keys %{$rel_info->{cond}} ) {
203 unless (exists $other_columns_idx{$_}) {
204 carp "Ignoring relationship '$rel' on '$moniker' - related resultsource '@{[ $relsource->source_name ]}' does not contain one of the specified columns: '$_'\n";
209 my @cond = sort { $other_columns_idx{$a} <=> $other_columns_idx{$b} } keys(%{$rel_info->{cond}});
211 # Get the key information, mapping off the foreign/self markers
212 my @refkeys = map {/^\w+\.(\w+)$/} @cond;
213 my @keys = map {$rel_info->{cond}->{$_} =~ /^\w+\.(\w+)$/} @cond;
215 # determine if this relationship is a self.fk => foreign.pk (i.e. belongs_to)
218 #first it can be specified explicitly
219 if ( exists $rel_info->{attrs}{is_foreign_key_constraint} ) {
220 $fk_constraint = $rel_info->{attrs}{is_foreign_key_constraint};
222 # it can not be multi
223 elsif ( $rel_info->{attrs}{accessor}
224 && $rel_info->{attrs}{accessor} eq 'multi' ) {
227 # if indeed single, check if all self.columns are our primary keys.
228 # this is supposed to indicate a has_one/might_have...
229 # where's the introspection!!?? :)
231 $fk_constraint = not $source->_compare_relationship_keys(\@keys, \@primary);
234 my ($otherrelname, $otherrelationship) = %{ $source->reverse_relationship_info($rel) };
237 for my $c (qw/delete update/) {
238 if (exists $rel_info->{attrs}{"on_$c"}) {
239 if ($fk_constraint) {
240 $cascade->{$c} = $rel_info->{attrs}{"on_$c"};
242 elsif ( $rel_info->{attrs}{"on_$c"} ) {
243 carp "SQLT attribute 'on_$c' was supplied for relationship '$moniker/$rel', which does not appear to be a foreign constraint. "
244 . "If you are sure that SQLT must generate a constraint for this relationship, add 'is_foreign_key_constraint => 1' to the attributes.\n";
247 elsif (defined $otherrelationship and $otherrelationship->{attrs}{$c eq 'update' ? 'cascade_copy' : 'cascade_delete'}) {
248 $cascade->{$c} = 'CASCADE';
253 # Constraints are added only if applicable
254 next unless $fk_constraint;
256 # Make sure we don't create the same foreign key constraint twice
257 my $key_test = join("\x00", sort @keys);
258 next if $created_FK_rels{$rel_table}->{$key_test};
261 $created_FK_rels{$rel_table}->{$key_test} = 1;
263 my $is_deferrable = $rel_info->{attrs}{is_deferrable};
265 # calculate dependencies: do not consider deferrable constraints and
266 # self-references for dependency calculations
267 if (! $is_deferrable and $rel_table ne $table_name) {
268 $tables{$table_name}{foreign_table_deps}{$rel_table}++;
271 # trim schema before generating constraint/index names
272 (my $table_abbrev = $table_name) =~ s/ ^ [^\.]+ \. //x;
274 $table->add_constraint(
275 type => 'foreign_key',
276 name => join('_', $table_abbrev, 'fk', @keys),
278 reference_fields => \@refkeys,
279 reference_table => $rel_table,
280 on_delete => uc ($cascade->{delete} || ''),
281 on_update => uc ($cascade->{update} || ''),
282 (defined $is_deferrable ? ( deferrable => $is_deferrable ) : ()),
285 # global parser_args add_fk_index param can be overridden on the rel def
286 my $add_fk_index_rel = (exists $rel_info->{attrs}{add_fk_index}) ? $rel_info->{attrs}{add_fk_index} : $add_fk_index;
288 # Check that we do not create an index identical to the PK index
289 # (some RDBMS croak on this, and it generally doesn't make much sense)
290 # NOTE: we do not sort the key columns because the order of
291 # columns is important for indexes and two indexes with the
292 # same cols but different order are allowed and sometimes
294 next if join("\x00", @keys) eq join("\x00", @primary);
296 if ($add_fk_index_rel) {
297 (my $idx_name = $table_name) =~ s/ ^ [^\.]+ \. //x;
298 my $index = $table->add_index(
299 name => join('_', $table_abbrev, 'idx', @keys),
310 # attach the tables to the schema in dependency order
312 map { $_ => _resolve_deps ($_, \%tables) } (keys %tables)
317 keys %{$dependencies->{$a} || {} } <=> keys %{ $dependencies->{$b} || {} }
323 $schema->add_table ($tables{$table}{object});
324 $tables{$table}{source} -> _invoke_sqlt_deploy_hook( $tables{$table}{object} );
326 # the hook might have already removed the table
327 if ($schema->get_table($table) && $table =~ /^ \s* \( \s* SELECT \s+/ix) {
330 Custom SQL through ->name(\'( SELECT ...') is DEPRECATED, for more details see
331 "Arbitrary SQL through a custom ResultSource" in DBIx::Class::Manual::Cookbook
332 or http://search.cpan.org/dist/DBIx-Class/lib/DBIx/Class/Manual/Cookbook.pod
336 # remove the table as there is no way someone might want to
337 # actually deploy this
338 $schema->drop_table ($table);
343 my @views = map { $dbicschema->source($_) } keys %view_monikers;
345 my $view_dependencies = {
347 $_ => _resolve_deps( $dbicschema->source($_), \%view_monikers )
348 } ( keys %view_monikers )
353 keys %{ $view_dependencies->{ $a->source_name } || {} } <=>
354 keys %{ $view_dependencies->{ $b->source_name } || {} }
355 || $a->source_name cmp $b->source_name
357 map { $dbicschema->source($_) }
360 foreach my $source (@view_sources)
362 my $view_name = $source->name;
364 # FIXME - this isn't the right way to do it, but sqlt does not
365 # support quoting properly to be signaled about this
366 $view_name = $$view_name if ref $view_name eq 'SCALAR';
368 # Skip custom query sources
369 next if ref $view_name;
371 # Its possible to have multiple DBIC source using same table
372 next if $views{$view_name}++;
374 $dbicschema->throw_exception ("view $view_name is missing a view_definition")
375 unless $source->view_definition;
377 my $view = $schema->add_view (
379 fields => [ $source->columns ],
380 $source->view_definition ? ( 'sql' => $source->view_definition ) : ()
381 ) || $dbicschema->throw_exception ($schema->error);
383 $source->_invoke_sqlt_deploy_hook($view);
387 if ($dbicschema->can('sqlt_deploy_hook')) {
388 $dbicschema->sqlt_deploy_hook($schema);
395 # Quick and dirty dependency graph calculator
398 my ( $question, $answers, $seen ) = @_;
403 # copy and bump all deps by one (so we can reconstruct the chain)
404 my %seen = map { $_ => $seen->{$_} + 1 } ( keys %$seen );
405 if ( blessed($question)
406 && $question->isa('DBIx::Class::ResultSource::View') )
408 $seen{ $question->result_class } = 1;
409 @deps = keys %{ $question->{deploy_depends_on} };
412 $seen{$question} = 1;
413 @deps = keys %{ $answers->{$question}{foreign_table_deps} };
416 for my $dep (@deps) {
417 if ( $seen->{$dep} ) {
422 if ( blessed($question)
423 && $question->isa('DBIx::Class::ResultSource::View') )
425 no warnings 'uninitialized';
426 my ($next_dep_source_name) =
428 $question->schema->source($_)->result_class eq $dep
429 && !( $question->schema->source($_)
430 ->isa('DBIx::Class::ResultSource::Table') )
431 } @{ [ $question->schema->sources ] };
432 return {} unless $next_dep_source_name;
433 $next_dep = $question->schema->source($next_dep_source_name);
438 my $subdeps = _resolve_deps( $next_dep, $answers, \%seen );
439 $ret->{$_} += $subdeps->{$_} for ( keys %$subdeps );
449 SQL::Translator::Parser::DBIx::Class - Create a SQL::Translator schema
450 from a DBIx::Class::Schema instance
456 my $schema = MyApp::Schema->connect("dbi:SQLite:something.db");
457 $schema->create_ddl_dir();
465 my $schema = MyApp::Schema->connect;
466 my $trans = SQL::Translator->new (
467 parser => 'SQL::Translator::Parser::DBIx::Class',
469 dbic_schema => $schema,
476 producer => 'SQLite',
477 ) or die SQL::Translator->error;
478 my $out = $trans->translate() or die $trans->error;
482 This class requires L<SQL::Translator> installed to work.
484 C<SQL::Translator::Parser::DBIx::Class> reads a DBIx::Class schema,
485 interrogates the columns, and stuffs it all in an $sqlt_schema object.
487 Its primary use is in deploying database layouts described as a set
488 of L<DBIx::Class> classes, to a database. To do this, see
489 L<DBIx::Class::Schema/deploy>.
491 This can also be achieved by having DBIx::Class export the schema as a
492 set of SQL files ready for import into your database, or passed to
493 other machines that need to have your application installed but don't
494 have SQL::Translator installed. To do this see
495 L<DBIx::Class::Schema/create_ddl_dir>.
497 =head1 PARSER OPTIONS
501 The DBIx::Class schema (either an instance or a class name) to be parsed.
502 This argument is in fact optional - instead one can supply it later at
503 translation time as an argument to L<SQL::Translator/translate>. In
504 other words both of the following invocations are valid and will produce
505 conceptually identical output:
507 my $yaml = SQL::Translator->new(
508 parser => 'SQL::Translator::Parser::DBIx::Class',
510 dbic_schema => $schema,
512 producer => 'SQL::Translator::Producer::YAML',
515 my $yaml = SQL::Translator->new(
516 parser => 'SQL::Translator::Parser::DBIx::Class',
517 producer => 'SQL::Translator::Producer::YAML',
518 )->translate(data => $schema);
522 Create an index for each foreign key.
523 Enabled by default, as having indexed foreign key columns is normally the
524 sensible thing to do.
530 =item Arguments: \@class_names
534 Limit the amount of parsed sources by supplying an explicit list of source names.
538 L<SQL::Translator>, L<DBIx::Class::Schema>
540 =head1 FURTHER QUESTIONS?
542 Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
544 =head1 COPYRIGHT AND LICENSE
546 This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
547 by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
548 redistribute it and/or modify it under the same terms as the
549 L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.