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package Rose::DB::Object::Metadata::Relationship::OneToMany; |
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use strict; |
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use Carp(); |
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use Rose::DB::Object::Metadata::Relationship; |
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our @ISA = qw(Rose::DB::Object::Metadata::Relationship); |
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use Rose::Object::MakeMethods::Generic; |
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use Rose::DB::Object::MakeMethods::Generic; |
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our $Debug = 0; |
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our $VERSION = '0.781'; |
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__PACKAGE__->default_auto_method_types(qw(find get_set_on_save add_on_save)); |
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__PACKAGE__->add_common_method_maker_argument_names |
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( |
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qw(class share_db key_columns manager_class manager_method |
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manager_count_method manager_iterator_method manager_find_method |
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manager_args query_args join_args) |
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); |
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use Rose::Object::MakeMethods::Generic |
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boolean => |
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[ |
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'share_db' => { default => 1 }, |
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], |
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hash => |
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[ |
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key_column => { hash_key => 'key_columns' }, |
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key_columns => { interface => 'get_set_all' }, |
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], |
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); |
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Rose::Object::MakeMethods::Generic->make_methods |
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{ preserve_existing => 1 }, |
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scalar => |
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[ |
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__PACKAGE__->common_method_maker_argument_names |
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], |
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); |
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__PACKAGE__->method_maker_info |
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( |
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count => |
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{ |
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class => 'Rose::DB::Object::MakeMethods::Generic', |
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type => 'objects_by_key', |
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interface => 'count', |
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}, |
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find => |
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{ |
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class => 'Rose::DB::Object::MakeMethods::Generic', |
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type => 'objects_by_key', |
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interface => 'find', |
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}, |
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iterator => |
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{ |
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class => 'Rose::DB::Object::MakeMethods::Generic', |
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type => 'objects_by_key', |
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interface => 'iterator', |
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}, |
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get_set => |
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{ |
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class => 'Rose::DB::Object::MakeMethods::Generic', |
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type => 'objects_by_key', |
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interface => 'get_set', |
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}, |
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get_set_now => |
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{ |
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class => 'Rose::DB::Object::MakeMethods::Generic', |
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type => 'objects_by_key', |
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interface => 'get_set_now', |
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}, |
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get_set_on_save => |
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{ |
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class => 'Rose::DB::Object::MakeMethods::Generic', |
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type => 'objects_by_key', |
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interface => 'get_set_on_save', |
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}, |
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add_now => |
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{ |
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class => 'Rose::DB::Object::MakeMethods::Generic', |
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type => 'objects_by_key', |
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interface => 'add_now', |
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}, |
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add_on_save => |
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{ |
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class => 'Rose::DB::Object::MakeMethods::Generic', |
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type => 'objects_by_key', |
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interface => 'add_on_save', |
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}, |
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); |
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sub type { 'one to many' } |
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sub is_singular { 0 } |
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sub foreign_class { shift->class(@_) } |
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*map_column = \&key_column; |
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*column_map = \&key_columns; |
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sub id |
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{ |
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my($self) = shift; |
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my $column_map = $self->column_map; |
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return $self->parent->class . ' ' . $self->class . ' ' . |
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join("\0", map { join("\1", lc $_, lc $column_map->{$_}) } sort keys %$column_map); |
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125
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#join("\0", map { $_ . '=' . ($self->$_() || 0) } qw(required)); |
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} |
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sub build_method_name_for_type |
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{ |
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my($self, $type) = @_; |
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if($type eq 'get_set' || $type eq 'get_set_now' || $type eq 'get_set_on_save') |
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{ |
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return $self->name; |
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} |
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elsif($type eq 'add_now' || $type eq 'add_on_save') |
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{ |
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return 'add_' . $self->name; |
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} |
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elsif($type eq 'find') |
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{ |
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return 'find_' . $self->name; |
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} |
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elsif($type eq 'iterator') |
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{ |
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return $self->name . '_iterator'; |
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} |
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elsif($type eq 'count') |
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{ |
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return $self->name . '_count'; |
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} |
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return undef; |
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} |
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sub is_ready_to_make_methods |
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{ |
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my($self) = shift; |
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if($Debug || $Rose::DB::Object::Metadata::Debug) |
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{ |
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my $error; |
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if(!$self->class) |
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{ |
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$error = "does not belong to a class"; |
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} |
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elsif(!$self->key_columns && !$self->query_args) |
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{ |
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$error = "has no key columns or query args"; |
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} |
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warn $self->parent->class, ': one-to-many relationship ', $self->name, " NOT READY - $error" |
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if($error); |
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} |
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4
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return $self->class && ($self->key_columns || $self->query_args) ? 1 : 0; |
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} |
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1; |
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__END__ |
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184
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=head1 NAME |
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186
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Rose::DB::Object::Metadata::Relationship::OneToMany - One to many table relationship metadata object. |
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=head1 SYNOPSIS |
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190
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use Rose::DB::Object::Metadata::Relationship::OneToMany; |
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192
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$rel = Rose::DB::Object::Metadata::Relationship::OneToMany->new(...); |
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$rel->make_methods(...); |
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... |
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196
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=head1 DESCRIPTION |
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Objects of this class store and manipulate metadata for relationships in which a single row from one table refers to multiple rows in another table. |
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This class inherits from L<Rose::DB::Object::Metadata::Relationship>. Inherited methods that are not overridden will not be documented a second time here. See the L<Rose::DB::Object::Metadata::Relationship> documentation for more information. |
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202
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=head1 METHOD MAP |
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204
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=over 4 |
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206
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=item C<count> |
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208
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L<Rose::DB::Object::MakeMethods::Generic>, L<objects_by_key|Rose::DB::Object::MakeMethods::Generic/objects_by_key>, C<interface =E<gt> 'count'> ... |
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210
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=item C<find> |
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212
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L<Rose::DB::Object::MakeMethods::Generic>, L<objects_by_key|Rose::DB::Object::MakeMethods::Generic/objects_by_key>, C<interface =E<gt> 'find'> ... |
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214
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=item C<iterator> |
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216
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L<Rose::DB::Object::MakeMethods::Generic>, L<objects_by_key|Rose::DB::Object::MakeMethods::Generic/objects_by_key>, C<interface =E<gt> 'iterator'> ... |
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218
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=item C<get_set> |
219
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220
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L<Rose::DB::Object::MakeMethods::Generic>, L<objects_by_key|Rose::DB::Object::MakeMethods::Generic/objects_by_key>, |
221
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C<interface =E<gt> 'get_set'> ... |
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=item C<get_set_now> |
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L<Rose::DB::Object::MakeMethods::Generic>, L<objects_by_key|Rose::DB::Object::MakeMethods::Generic/objects_by_key>, C<interface =E<gt> 'get_set_now'> ... |
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=item C<get_set_on_save> |
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L<Rose::DB::Object::MakeMethods::Generic>, L<objects_by_key|Rose::DB::Object::MakeMethods::Generic/objects_by_key>, C<interface =E<gt> 'get_set_on_save'> ... |
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=item C<add_now> |
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L<Rose::DB::Object::MakeMethods::Generic>, L<objects_by_key|Rose::DB::Object::MakeMethods::Generic/objects_by_key>, C<interface =E<gt> 'add_now'> ... |
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=item C<add_on_save> |
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L<Rose::DB::Object::MakeMethods::Generic>, L<objects_by_key|Rose::DB::Object::MakeMethods::Generic/objects_by_key>, C<interface =E<gt> 'add_on_save'> ... |
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=back |
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See the L<Rose::DB::Object::Metadata::Relationship|Rose::DB::Object::Metadata::Relationship/"MAKING METHODS"> documentation for an explanation of this method map. |
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=head1 CLASS METHODS |
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=over 4 |
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=item B<default_auto_method_types [TYPES]> |
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Get or set the default list of L<auto_method_types|Rose::DB::Object::Metadata::Relationship/auto_method_types>. TYPES should be a list of relationship method types. Returns the list of default relationship method types (in list context) or a reference to an array of the default relationship method types (in scalar context). The default list contains "find", "get_set_on_save", and "add_on_save". |
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=back |
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=head1 OBJECT METHODS |
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=over 4 |
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=item B<build_method_name_for_type TYPE> |
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Return a method name for the relationship method type TYPE. |
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For the method types "get_set", "get_set_now", and "get_set_on_save", the relationship's L<name|Rose::DB::Object::Metadata::Relationship/name> is returned. |
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For the method types "add_now" and "add_on_save", the relationship's L<name|Rose::DB::Object::Metadata::Relationship/name> prefixed with "add_" is returned. |
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For the method type "find", the relationship's L<name|Rose::DB::Object::Metadata::Relationship/name> prefixed with "find_" is returned. |
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For the method type "count", the relationship's L<name|Rose::DB::Object::Metadata::Relationship/name> suffixed with "_count" is returned. |
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For the method type "iterator", the relationship's L<name|Rose::DB::Object::Metadata::Relationship/name> suffixed with "_iterator" is returned. |
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Otherwise, undef is returned. |
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=item B<is_singular> |
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Returns false. |
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=item B<manager_class [CLASS]> |
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Get or set the name of the L<Rose::DB::Object::Manager>-derived class used to fetch objects. The L<make_methods|Rose::DB::Object::Metadata::Relationship/make_methods> method will use L<Rose::DB::Object::Manager> if this value is left undefined. |
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281
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B<Note:> when the name of a relationship that has C<manager_args> is used in a L<Rose::DB::Object::Manager> L<with_objects|Rose::DB::Object::Manager/with_objects> or L<require_objects|Rose::DB::Object::Manager/require_objects> parameter value, I<only> the L<sort_by|Rose::DB::Object::Manager/sort_by> argument will be copied from C<manager_args> and incorporated into the query. |
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283
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=item B<manager_method [METHOD]> |
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285
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Get or set the name of the L<manager_class|/manager_class> class method to call when fetching objects. The L<make_methods|Rose::DB::Object::Metadata::Relationship/make_methods> method will use L<get_objects|Rose::DB::Object::Manager/get_objects> if this value is left undefined. |
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287
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=item B<manager_count_method [METHOD]> |
288
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289
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Get or set the name of the L<manager_class|/manager_class> class method to call when counting objects. The L<make_methods|Rose::DB::Object::Metadata::Relationship/make_methods> method will use L<get_objects_count|Rose::DB::Object::Manager/get_objects_count> if this value is left undefined. |
290
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291
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=item B<manager_iterator_method [METHOD]> |
292
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293
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Get or set the name of the L<manager_class|/manager_class> class method to call when creating an iterator. The L<make_methods|Rose::DB::Object::Metadata::Relationship/make_methods> method will use L<get_objects_iterator|Rose::DB::Object::Manager/get_objects_iterator> if this value is left undefined. |
294
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295
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=item B<manager_args [HASHREF]> |
296
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297
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Get or set a reference to a hash of name/value arguments to pass to the L<manager_method|/manager_method> when fetching objects. For example, this can be used to enforce a particular sort order for objects fetched via this relationship. For example: |
298
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299
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Product->meta->add_relationship |
300
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( |
301
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code_names => |
302
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{ |
303
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type => 'one to many', |
304
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class => 'CodeName', |
305
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column_map => { id => 'product_id' }, |
306
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manager_args => |
307
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{ |
308
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sort_by => CodeName->meta->table . '.name', |
309
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}, |
310
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}, |
311
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); |
312
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313
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This would ensure that a C<Product>'s C<code_names()> are listed in alphabetical order. Note that the "name" column is prefixed by the name of the table fronted by the C<CodeName> class. This is important because several tables may have a column named "name." If this relationship is used to form a JOIN in a query along with one of those tables, then the "name" column will be ambiguous. Adding a table name prefix disambiguates the column name. |
314
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315
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Also note that the table name is not hard-coded. Instead, it is fetched from the L<Rose::DB::Object>-derived class that fronts the table. This is more verbose, but is a much better choice than including the literal table name when it comes to long-term maintenance of the code. |
316
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317
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See the documentation for L<Rose::DB::Object::Manager>'s L<get_objects|Rose::DB::Object::Manager/get_objects> method for a full list of valid arguments for use with the C<manager_args> parameter, but remember that you can define your own custom L<manager_class|/manager_class> and thus can also define what kinds of arguments C<manager_args> will accept. |
318
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319
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=item B<map_column LOCAL [, FOREIGN]> |
320
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321
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If passed a local column name LOCAL, return the corresponding column name in the foreign table. If passed both a local column name LOCAL and a foreign column name FOREIGN, set the local/foreign mapping and return the foreign column name. |
322
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323
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=item B<column_map [HASH | HASHREF]> |
324
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325
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Get or set a reference to a hash that maps local column names to foreign column names. |
326
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327
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=item B<query_args [ARRAYREF]> |
328
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329
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Get or set a reference to an array of query arguments to add to the L<query|Rose::DB::Object::Manager/query> passed to the L<manager_method|/manager_method> when fetching objects. |
330
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331
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=item B<type> |
332
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333
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Returns "one to many". |
334
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335
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=back |
336
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337
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|
|
=head1 AUTHOR |
338
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339
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|
|
John C. Siracusa (siracusa@gmail.com) |
340
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341
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=head1 LICENSE |
342
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343
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Copyright (c) 2010 by John C. Siracusa. All rights reserved. This program is |
344
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free software; you can redistribute it and/or modify it under the same terms |
345
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as Perl itself. |