1 package # hide from PAUSE
2 DBIx::Class::Relationship::HasOne;
7 use DBIx::Class::_Util qw( dbic_internal_try dbic_internal_catch );
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 my $pri = $class->result_source->_single_pri_col_or_die;
28 my ($f_key,$guess,$f_rsrc);
29 if (defined $cond && length $cond) {
31 $guess = "caller specified foreign key '$f_key'";
34 # at this point we need to load the foreigner, expensive or not
35 $class->ensure_class_loaded($f_class);
37 $f_rsrc = dbic_internal_try {
38 my $r = $f_class->result_source;
39 die "There got to be some columns by now... (exception caught and rewritten by catch below)"
44 $class->throw_exception(
45 "Foreign class '$f_class' does not seem to be a Result class "
46 . "(or it simply did not load entirely due to a circular relation chain)"
50 if ($f_rsrc->has_column($rel)) {
52 $guess = "using given relationship name '$rel' as foreign key column name";
55 $f_key = $f_rsrc->_single_pri_col_or_die;
56 $guess = "using primary key of foreign class for foreign key";
60 # FIXME - this check needs to be moved to schema-composition time...
61 # # only perform checks if the far side was not preloaded above *AND*
62 # # appears to have been loaded by something else (has a rsrc)
63 # if (! $f_rsrc and $f_rsrc = dbic_internal_try { $f_class->result_source }) {
64 # $class->throw_exception(
65 # "No such column '$f_key' on foreign class ${f_class} ($guess)"
66 # ) if !$f_rsrc->has_column($f_key);
69 $cond = { "foreign.${f_key}" => "self.${pri}" };
71 $class->_validate_has_one_condition($cond);
73 my $default_cascade = ref $cond eq 'CODE' ? 0 : 1;
75 $class->add_relationship($rel, $f_class,
77 { accessor => 'single',
78 cascade_update => $default_cascade,
79 cascade_delete => $default_cascade,
81 ($join_type ? ('join_type' => $join_type) : ()),
86 sub _validate_has_one_condition {
87 my ($class, $cond ) = @_;
89 return if $ENV{DBIC_DONT_VALIDATE_RELS};
90 return unless 'HASH' eq ref $cond;
91 foreach my $foreign_id ( keys %$cond ) {
92 my $self_id = $cond->{$foreign_id};
94 # we can ignore a bad $self_id because add_relationship handles this
96 return unless $self_id =~ /^self\.(.*)$/;
100 my $column_info = $class->result_source->columns_info->{$key}
101 or $class->throw_exception(
102 "Defining rel on ${class} that includes '$key' "
103 . 'but no such column defined there yet'
107 "'might_have'/'has_one' must not be used on columns with is_nullable "
108 . "set to true ($class/$key). This almost certainly indicates an "
109 . "incorrect use of these relationship helpers instead of 'belongs_to'"
110 ) if $column_info->{is_nullable};