1 package # hide from PAUSE
2 DBIx::Class::Relationship::HasOne;
6 use Carp::Clan qw/^DBIx::Class/;
10 our %_pod_inherit_config =
12 class_map => { 'DBIx::Class::Relationship::HasOne' => 'DBIx::Class::Relationship' }
16 shift->_has_one('LEFT' => @_);
20 shift->_has_one(undef() => @_);
24 my ($class, $join_type, $rel, $f_class, $cond, $attrs) = @_;
26 $class->ensure_class_loaded($f_class);
28 my $pri = $class->_get_primary_key;
30 $class->throw_exception(
31 "might_have/has_one needs a primary key to infer a join; ".
33 ) if !defined $pri && (!defined $cond || !length $cond);
35 my $f_class_loaded = try { $f_class->columns };
36 my ($f_key,$too_many,$guess);
37 if (defined $cond && length $cond) {
39 $guess = "caller specified foreign key '$f_key'";
40 } elsif ($f_class_loaded && $f_class->has_column($rel)) {
42 $guess = "using given relationship '$rel' for foreign key";
44 $f_key = $class->_get_primary_key($f_class);
45 $guess = "using primary key of foreign class for foreign key";
47 $class->throw_exception(
48 "No such column ${f_key} on foreign class ${f_class} ($guess)"
49 ) if $f_class_loaded && !$f_class->has_column($f_key);
50 $cond = { "foreign.${f_key}" => "self.${pri}" };
52 $class->_validate_has_one_condition($cond);
53 $class->add_relationship($rel, $f_class,
55 { accessor => 'single',
56 cascade_update => 1, cascade_delete => 1,
57 ($join_type ? ('join_type' => $join_type) : ()),
62 sub _get_primary_key {
63 my ( $class, $target_class ) = @_;
64 $target_class ||= $class;
65 my ($pri, $too_many) = try { $target_class->_pri_cols }
67 $class->throw_exception("Can't infer join condition on ${target_class}: $_");
70 $class->throw_exception(
71 "might_have/has_one can only infer join for a single primary key; ".
77 sub _validate_has_one_condition {
78 my ($class, $cond ) = @_;
80 return if $ENV{DBIC_DONT_VALIDATE_RELS};
81 return unless 'HASH' eq ref $cond;
82 foreach my $foreign_id ( keys %$cond ) {
83 my $self_id = $cond->{$foreign_id};
85 # we can ignore a bad $self_id because add_relationship handles this
87 return unless $self_id =~ /^self\.(.*)$/;
89 $class->throw_exception("Defining rel on ${class} that includes ${key} but no such column defined here yet")
90 unless $class->has_column($key);
91 my $column_info = $class->column_info($key);
92 if ( $column_info->{is_nullable} ) {
93 carp(qq'"might_have/has_one" must not be on columns with is_nullable set to true ($class/$key). This might indicate an incorrect use of those relationship helpers instead of belongs_to.');