1 package # hide from PAUSE
2 DBIx::Class::Relationship::BelongsTo;
4 # Documentation for these methods can be found in
5 # DBIx::Class::Relationship
12 our %_pod_inherit_config =
14 class_map => { 'DBIx::Class::Relationship::BelongsTo' => 'DBIx::Class::Relationship' }
18 my ($class, $rel, $f_class, $cond, $attrs) = @_;
20 # assume a foreign key contraint unless defined otherwise
21 $attrs->{is_foreign_key_constraint} = 1
22 if not exists $attrs->{is_foreign_key_constraint};
23 $attrs->{undef_on_null_fk} = 1
24 if not exists $attrs->{undef_on_null_fk};
26 # no join condition or just a column name
28 $class->ensure_class_loaded($f_class);
29 my %f_primaries = map { $_ => 1 } try { $f_class->_pri_cols }
31 $class->throw_exception( "Can't infer join condition for ${rel} on ${class}: $_");
34 my ($pri, $too_many) = keys %f_primaries;
35 $class->throw_exception(
36 "Can't infer join condition for ${rel} on ${class}; ".
37 "${f_class} has multiple primary keys"
40 my $fk = defined $cond ? $cond : $rel;
41 $class->throw_exception(
42 "Can't infer join condition for ${rel} on ${class}; ".
43 "$fk is not a column of $class"
44 ) unless $class->has_column($fk);
46 $cond = { "foreign.${pri}" => "self.${fk}" };
49 # explicit join condition
51 if (ref $cond eq 'HASH') { # ARRAY is also valid
54 if (m/\./) { # Explicit join condition
58 $cond_rel->{"foreign.$_"} = "self.".$cond->{$_};
65 $class->throw_exception(
66 'third argument for belongs_to must be undef, a column name, '.
76 $class->has_column($rel)
77 ) ? 'filter' : 'single';
79 my $fk_columns = ($acc_type eq 'single' and ref $cond eq 'HASH')
80 ? { map { $_ =~ /^self\.(.+)/ ? ( $1 => 1 ) : () } (values %$cond ) }
84 $class->add_relationship($rel, $f_class,
87 accessor => $acc_type,
88 $fk_columns ? ( fk_columns => $fk_columns ) : (),
96 # Attempt to remove the POD so it (maybe) falls off the indexer
100 #Alexander Hartmaier <Alexander.Hartmaier@t-systems.at>
102 #Matt S. Trout <mst@shadowcatsystems.co.uk>