use strict;
use warnings;
-use base qw/Class::Data::Inheritable/;
+use base qw/DBIx::Class Class::Data::Inheritable/;
+
+__PACKAGE__->load_own_components(qw/
+ HasMany
+ HasOne
+ BelongsTo
+ Accessor
+ CascadeActions
+ ProxyMethods
+ Base
+/);
__PACKAGE__->mk_classdata('_relationships', { } );
model. It allows your to set up relationships, and to perform joins
on searches.
+This POD details only the convenience methods for setting up standard
+relationship types. For more information see ::Relationship::Base
+
=head1 METHODS
+All convenience methods take a signature of the following format -
+
+ __PACKAGE__>method_name('relname', 'Foreign::Class', $join?, $attrs?);
+
+
+
=over 4
-=cut
+=item has_one
+
+ my $f_obj = $obj->relname;
+
+Creates a one-one relationship with another class; defaults to PK-PK for
+the join condition unless a condition is specified.
+
+=item might_have
+
+ my $f_obj = $obj->relname;
-sub add_relationship {
- my ($class, $rel, $f_class, $cond, $attrs) = @_;
- my %rels = %{ $class->_relationships };
- $rels{$rel} = { class => $f_class,
- cond => $cond,
- attrs => $attrs };
- $class->_relationships(\%rels);
-}
-
-sub _cond_key {
- my ($self, $attrs, $key) = @_;
- my $action = $attrs->{_action} || '';
- if ($action eq 'convert') {
- unless ($key =~ s/^foreign\.//) {
- die "Unable to convert relationship to WHERE clause: invalid key ${key}";
- }
- return $key;
- } elsif ($action eq 'join') {
- my ($type, $field) = split(/\./, $key);
- if ($attrs->{_aliases}{$type}) {
- return join('.', $attrs->{_aliases}{$type}, $field);
- } else {
- die "Unable to resolve type ${type}: only have aliases for ".
- join(', ', keys %{$attrs->{_aliases}{$type} || {}});
- }
- }
- return $self->NEXT::ACTUAL::_cond_key($attrs, $key);
-}
-
-sub _cond_value {
- my ($self, $attrs, $key, $value) = @_;
- my $action = $attrs->{_action} || '';
- if ($action eq 'convert') {
- unless ($value =~ s/^self\.//) {
- die "Unable to convert relationship to WHERE clause: invalid value ${value}";
- }
- unless ($self->_columns->{$value}) {
- die "Unable to convert relationship to WHERE clause: no such accessor ${value}";
- }
- push(@{$attrs->{bind}}, $self->get_column($value));
- return '?';
- } elsif ($action eq 'join') {
- my ($type, $field) = split(/\./, $value);
- if ($attrs->{_aliases}{$type}) {
- return join('.', $attrs->{_aliases}{$type}, $field);
- } else {
- die "Unable to resolve type ${type}: only have aliases for ".
- join(', ', keys %{$attrs->{_aliases}{$type} || {}});
- }
- }
-
- return $self->NEXT::ACTUAL::_cond_value($attrs, $key, $value)
-}
-
-sub search_related {
- my $self = shift;
- my $rel = shift;
- my $attrs = { };
- if (@_ > 1 && ref $_[$#_] eq 'HASH') {
- $attrs = { %{ pop(@_) } };
- }
- my $rel_obj = $self->_relationships->{$rel};
- die "No such relationship ${rel}" unless $rel;
- $attrs = { %{$rel_obj->{attrs} || {}}, %{$attrs || {}} };
- my $s_cond;
- if (@_) {
- die "Invalid query: @_" if (@_ > 1 && (@_ % 2 == 1));
- my $query = ((@_ > 1) ? {@_} : shift);
- $s_cond = $self->_cond_resolve($query, $attrs);
- }
- $attrs->{_action} = 'convert';
- my ($cond) = $self->_cond_resolve($rel_obj->{cond}, $attrs);
- $cond = "${s_cond} AND ${cond}" if $s_cond;
- return $rel_obj->{class}->retrieve_from_sql($cond, @{$attrs->{bind} || []},
- $attrs);
-}
-
-sub create_related {
- my ($self, $rel, $values, $attrs) = @_;
- die "Can't call create_related as class method" unless ref $self;
- die "create_related needs a hash" unless (ref $values eq 'HASH');
- my $rel_obj = $self->_relationships->{$rel};
- die "No such relationship ${rel}" unless $rel;
- die "Can't abstract implicit create for ${rel}, condition not a hash"
- unless ref $rel_obj->{cond} eq 'HASH';
- $attrs = { %{$rel_obj->{attrs}}, %{$attrs || {}}, _action => 'convert' };
- my %fields = %$values;
- while (my ($k, $v) = each %{$rel_obj->{cond}}) {
- $self->_cond_value($attrs, $k => $v);
- $fields{$self->_cond_key($attrs, $k)} = (@{delete $attrs->{bind}})[0];
- }
- return $rel_obj->{class}->create(\%fields);
-}
+Creates an optional one-one relationship with another class; defaults to PK-PK
+for the join condition unless a condition is specified.
+
+=item has_many
+
+ my @f_obj = $obj->relname($cond?, $attrs?);
+ my $f_result_set = $obj->relname($cond?, $attrs?);
+
+ $obj->add_to_relname(\%col_data);
+
+Creates a one-many relationship with another class;
+
+=item belongs_to
+
+ my $f_obj = $obj->relname;
+
+ $obj->relname($new_f_obj);
+
+Creates a relationship where we store the foreign class' PK; if $join is a
+column name instead of a condition that is assumed to be the FK, if not
+has_many assumes the FK is the relname is that is a column on the current
+class.
+
+=cut
1;
=head1 AUTHORS
-Matt S. Trout <perl-stuff@trout.me.uk>
+Matt S. Trout <mst@shadowcatsystems.co.uk>
=head1 LICENSE