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 use vars qw($DEBUG $VERSION @EXPORT_OK);
13 $DEBUG = 0 unless defined $DEBUG;
16 use SQL::Translator::Utils qw(debug normalize_name);
17 use Carp::Clan qw/^SQL::Translator|^DBIx::Class|^Try::Tiny/;
18 use Scalar::Util 'weaken';
22 use base qw(Exporter);
24 @EXPORT_OK = qw(parse);
26 # -------------------------------------------------------------------
29 # setting parser_args => { add_fk_index => 0 } will prevent
30 # the auto-generation of an index for each FK.
32 # Note that $data, in the case of this parser, is not useful.
33 # We're working with DBIx::Class Schemas, not data streams.
34 # -------------------------------------------------------------------
36 # this is a hack to prevent schema leaks due to a retarded SQLT implementation
37 # DO NOT REMOVE (until SQLT2 is out, the all of this will be rewritten anyway)
38 weaken $_[1] if ref ($_[1]);
41 my $args = $tr->parser_args;
42 my $dbicschema = $args->{'DBIx::Class::Schema'} || $args->{"DBIx::Schema"} ||$data;
43 $dbicschema ||= $args->{'package'};
44 my $limit_sources = $args->{'sources'};
46 croak 'No DBIx::Class::Schema' unless ($dbicschema);
47 if (!ref $dbicschema) {
49 eval "require $dbicschema;"
52 croak "Can't load $dbicschema ($_)";
56 my $schema = $tr->schema;
59 $schema->name( ref($dbicschema) . " v" . ($dbicschema->schema_version || '1.x'))
60 unless ($schema->name);
62 my @monikers = sort $dbicschema->sources;
64 my $ref = ref $limit_sources || '';
65 $dbicschema->throw_exception ("'sources' parameter must be an array or hash ref")
66 unless( $ref eq 'ARRAY' || ref eq 'HASH' );
68 # limit monikers to those specified in
70 if ($ref eq 'ARRAY') {
71 $sources->{$_} = 1 for (@$limit_sources);
73 $sources = $limit_sources;
75 @monikers = grep { $sources->{$_} } @monikers;
79 my(%table_monikers, %view_monikers);
80 for my $moniker (@monikers){
81 my $source = $dbicschema->source($moniker);
82 if ( $source->isa('DBIx::Class::ResultSource::Table') ) {
83 $table_monikers{$moniker}++;
84 } elsif( $source->isa('DBIx::Class::ResultSource::View') ){
85 next if $source->is_virtual;
86 $view_monikers{$moniker}++;
91 foreach my $moniker (sort keys %table_monikers)
93 my $source = $dbicschema->source($moniker);
94 my $table_name = $source->name;
96 # FIXME - this isn't the right way to do it, but sqlt does not
97 # support quoting properly to be signaled about this
98 $table_name = $$table_name if ref $table_name eq 'SCALAR';
100 # It's possible to have multiple DBIC sources using the same table
101 next if $tables{$table_name};
103 $tables{$table_name}{source} = $source;
104 my $table = $tables{$table_name}{object} = SQL::Translator::Schema::Table->new(
108 foreach my $col ($source->columns)
110 # assuming column_info in dbic is the same as DBI (?)
111 # data_type is a number, column_type is text?
115 is_auto_increment => 0,
118 %{$source->column_info($col)}
120 if ($colinfo{is_nullable}) {
121 $colinfo{default} = '' unless exists $colinfo{default};
123 my $f = $table->add_field(%colinfo)
124 || $dbicschema->throw_exception ($table->error);
127 my @primary = $source->primary_columns;
129 $table->primary_key(@primary) if @primary;
131 my %unique_constraints = $source->unique_constraints;
132 foreach my $uniq (sort keys %unique_constraints) {
133 if (!$source->_compare_relationship_keys($unique_constraints{$uniq}, \@primary)) {
134 $table->add_constraint(
137 fields => $unique_constraints{$uniq}
142 my @rels = $source->relationships();
146 # global add_fk_index set in parser_args
147 my $add_fk_index = (exists $args->{add_fk_index} && ! $args->{add_fk_index}) ? 0 : 1;
149 foreach my $rel (sort @rels)
152 my $rel_info = $source->relationship_info($rel);
154 # Ignore any rel cond that isn't a straight hash
155 next unless ref $rel_info->{cond} eq 'HASH';
157 my $relsource = $source->related_source($rel);
159 # related sources might be excluded via a {sources} filter or might be views
160 next unless exists $table_monikers{$relsource->source_name};
162 my $rel_table = $relsource->name;
164 # FIXME - this isn't the right way to do it, but sqlt does not
165 # support quoting properly to be signaled about this
166 $rel_table = $$rel_table if ref $rel_table eq 'SCALAR';
168 my $reverse_rels = $source->reverse_relationship_info($rel);
169 my ($otherrelname, $otherrelationship) = each %{$reverse_rels};
171 # Force the order of @cond to match the order of ->add_columns
173 my %other_columns_idx = map {'foreign.'.$_ => ++$idx } $relsource->columns;
174 my @cond = sort { $other_columns_idx{$a} cmp $other_columns_idx{$b} } keys(%{$rel_info->{cond}});
176 # Get the key information, mapping off the foreign/self markers
177 my @refkeys = map {/^\w+\.(\w+)$/} @cond;
178 my @keys = map {$rel_info->{cond}->{$_} =~ /^\w+\.(\w+)$/} @cond;
180 # determine if this relationship is a self.fk => foreign.pk (i.e. belongs_to)
183 #first it can be specified explicitly
184 if ( exists $rel_info->{attrs}{is_foreign_key_constraint} ) {
185 $fk_constraint = $rel_info->{attrs}{is_foreign_key_constraint};
187 # it can not be multi
188 elsif ( $rel_info->{attrs}{accessor}
189 && $rel_info->{attrs}{accessor} eq 'multi' ) {
192 # if indeed single, check if all self.columns are our primary keys.
193 # this is supposed to indicate a has_one/might_have...
194 # where's the introspection!!?? :)
196 $fk_constraint = not $source->_compare_relationship_keys(\@keys, \@primary);
200 for my $c (qw/delete update/) {
201 if (exists $rel_info->{attrs}{"on_$c"}) {
202 if ($fk_constraint) {
203 $cascade->{$c} = $rel_info->{attrs}{"on_$c"};
205 elsif ( $rel_info->{attrs}{"on_$c"} ) {
206 carp "SQLT attribute 'on_$c' was supplied for relationship '$moniker/$rel', which does not appear to be a foreign constraint. "
207 . "If you are sure that SQLT must generate a constraint for this relationship, add 'is_foreign_key_constraint => 1' to the attributes.\n";
210 elsif (defined $otherrelationship and $otherrelationship->{attrs}{$c eq 'update' ? 'cascade_copy' : 'cascade_delete'}) {
211 $cascade->{$c} = 'CASCADE';
216 # Constraints are added only if applicable
217 next unless $fk_constraint;
219 # Make sure we dont create the same foreign key constraint twice
220 my $key_test = join("\x00", sort @keys);
221 next if $created_FK_rels{$rel_table}->{$key_test};
224 $created_FK_rels{$rel_table}->{$key_test} = 1;
226 my $is_deferrable = $rel_info->{attrs}{is_deferrable};
228 # calculate dependencies: do not consider deferrable constraints and
229 # self-references for dependency calculations
230 if (! $is_deferrable and $rel_table ne $table_name) {
231 $tables{$table_name}{foreign_table_deps}{$rel_table}++;
234 $table->add_constraint(
235 type => 'foreign_key',
236 name => join('_', $table_name, 'fk', @keys),
238 reference_fields => \@refkeys,
239 reference_table => $rel_table,
240 on_delete => uc ($cascade->{delete} || ''),
241 on_update => uc ($cascade->{update} || ''),
242 (defined $is_deferrable ? ( deferrable => $is_deferrable ) : ()),
245 # global parser_args add_fk_index param can be overridden on the rel def
246 my $add_fk_index_rel = (exists $rel_info->{attrs}{add_fk_index}) ? $rel_info->{attrs}{add_fk_index} : $add_fk_index;
248 # Check that we do not create an index identical to the PK index
249 # (some RDBMS croak on this, and it generally doesn't make much sense)
250 # NOTE: we do not sort the key columns because the order of
251 # columns is important for indexes and two indexes with the
252 # same cols but different order are allowed and sometimes
254 next if join("\x00", @keys) eq join("\x00", @primary);
256 if ($add_fk_index_rel) {
257 my $index = $table->add_index(
258 name => join('_', $table_name, 'idx', @keys),
269 # attach the tables to the schema in dependency order
271 map { $_ => _resolve_deps ($_, \%tables) } (keys %tables)
276 keys %{$dependencies->{$a} || {} } <=> keys %{ $dependencies->{$b} || {} }
282 $schema->add_table ($tables{$table}{object});
283 $tables{$table}{source} -> _invoke_sqlt_deploy_hook( $tables{$table}{object} );
285 # the hook might have already removed the table
286 if ($schema->get_table($table) && $table =~ /^ \s* \( \s* SELECT \s+/ix) {
289 Custom SQL through ->name(\'( SELECT ...') is DEPRECATED, for more details see
290 "Arbitrary SQL through a custom ResultSource" in DBIx::Class::Manual::Cookbook
291 or http://search.cpan.org/dist/DBIx-Class/lib/DBIx/Class/Manual/Cookbook.pod
295 # remove the table as there is no way someone might want to
296 # actually deploy this
297 $schema->drop_table ($table);
302 my @views = map { $dbicschema->source($_) } keys %view_monikers;
304 my $view_dependencies = {
306 $_ => _resolve_view_deps( $dbicschema->source($_), \%view_monikers )
307 } ( keys %view_monikers )
312 keys %{ $view_dependencies->{ $a->source_name } || {} } <=>
313 keys %{ $view_dependencies->{ $b->source_name } || {} }
314 || $a->source_name cmp $b->source_name
316 map { $dbicschema->source($_) }
319 foreach my $source (@view_sources)
321 my $view_name = $source->name;
323 # FIXME - this isn't the right way to do it, but sqlt does not
324 # support quoting properly to be signaled about this
325 $view_name = $$view_name if ref $view_name eq 'SCALAR';
327 # Skip custom query sources
328 next if ref $view_name;
330 # Its possible to have multiple DBIC source using same table
331 next if $views{$view_name}++;
333 $dbicschema->throw_exception ("view $view_name is missing a view_definition")
334 unless $source->view_definition;
336 my $view = $schema->add_view (
338 fields => [ $source->columns ],
339 $source->view_definition ? ( 'sql' => $source->view_definition ) : ()
340 ) || $dbicschema->throw_exception ($schema->error);
342 $source->_invoke_sqlt_deploy_hook($view);
346 if ($dbicschema->can('sqlt_deploy_hook')) {
347 $dbicschema->sqlt_deploy_hook($schema);
354 # Quick and dirty dependency graph calculator
357 my ($table, $tables, $seen) = @_;
362 # copy and bump all deps by one (so we can reconstruct the chain)
363 my %seen = map { $_ => $seen->{$_} + 1 } (keys %$seen);
366 for my $dep (keys %{$tables->{$table}{foreign_table_deps}} ) {
370 # warn and remove the circular constraint so we don't get flooded with the same warning over and over
371 #carp sprintf ("Circular dependency detected, schema may not be deployable:\n%s\n",
372 # join (' -> ', (sort { $seen->{$b} <=> $seen->{$a} } (keys %$seen) ), $table, $dep )
374 #delete $tables->{$table}{foreign_table_deps}{$dep};
379 my $subdeps = _resolve_deps ($dep, $tables, \%seen);
380 $ret->{$_} += $subdeps->{$_} for ( keys %$subdeps );
388 sub _resolve_view_deps {
389 my ( $view, $monikers, $seen ) = @_;
394 # copy and bump all deps by one (so we can reconstruct the chain)
395 my %seen = map { $_ => $seen->{$_} + 1 } ( keys %$seen );
396 $seen{ $view->source_name } = 1;
397 for my $dep ( keys %{ $view->{deploy_depends_on} } ) {
398 if ( $seen->{$dep} ) {
401 my ($new_source_name) =
402 grep { $view->schema->source($_)->source_name eq $dep }
403 @{ [ $view->schema->sources ] };
405 _resolve_view_deps( $view->schema->source($new_source_name),
406 $monikers, \%seen, );
407 $ret->{$_} += $subdeps->{$_} for ( keys %$subdeps );
418 SQL::Translator::Parser::DBIx::Class - Create a SQL::Translator schema
419 from a DBIx::Class::Schema instance
425 my $schema = MyApp::Schema->connect("dbi:SQLite:something.db");
426 $schema->create_ddl_dir();
434 my $schema = MyApp::Schema->connect;
435 my $trans = SQL::Translator->new (
436 parser => 'SQL::Translator::Parser::DBIx::Class',
445 producer => 'SQLite',
446 ) or die SQL::Translator->error;
447 my $out = $trans->translate() or die $trans->error;
451 This class requires L<SQL::Translator> installed to work.
453 C<SQL::Translator::Parser::DBIx::Class> reads a DBIx::Class schema,
454 interrogates the columns, and stuffs it all in an $sqlt_schema object.
456 Its primary use is in deploying database layouts described as a set
457 of L<DBIx::Class> classes, to a database. To do this, see
458 L<DBIx::Class::Schema/deploy>.
460 This can also be achieved by having DBIx::Class export the schema as a
461 set of SQL files ready for import into your database, or passed to
462 other machines that need to have your application installed but don't
463 have SQL::Translator installed. To do this see
464 L<DBIx::Class::Schema/create_ddl_dir>.
466 =head1 PARSER OPTIONS
470 Create an index for each foreign key.
471 Enabled by default, as having indexed foreign key columns is normally the
472 sensible thing to do.
478 =item Arguments: \@class_names
482 Limit the amount of parsed sources by supplying an explicit list of source names.
486 L<SQL::Translator>, L<DBIx::Class::Schema>
490 See L<DBIx::Class/CONTRIBUTORS>.
494 You may distribute this code under the same terms as Perl itself.