1 package # hide from PAUSE
2 DBIx::Class::Relationship::HasOne;
8 use DBIx::Class::_Util 'dbic_internal_try';
11 our %_pod_inherit_config =
13 class_map => { 'DBIx::Class::Relationship::HasOne' => 'DBIx::Class::Relationship' }
17 shift->_has_one('LEFT' => @_);
21 shift->_has_one(undef() => @_);
25 my ($class, $join_type, $rel, $f_class, $cond, $attrs) = @_;
27 my $pri = $class->result_source->_single_pri_col_or_die;
29 my ($f_key,$guess,$f_rsrc);
30 if (defined $cond && length $cond) {
32 $guess = "caller specified foreign key '$f_key'";
35 # at this point we need to load the foreigner, expensive or not
36 $class->ensure_class_loaded($f_class);
38 $f_rsrc = dbic_internal_try {
39 my $r = $f_class->result_source;
40 die "There got to be some columns by now... (exception caught and rewritten by catch below)"
45 $class->throw_exception(
46 "Foreign class '$f_class' does not seem to be a Result class "
47 . "(or it simply did not load entirely due to a circular relation chain)"
51 if ($f_rsrc->has_column($rel)) {
53 $guess = "using given relationship name '$rel' as foreign key column name";
56 $f_key = $f_rsrc->_single_pri_col_or_die;
57 $guess = "using primary key of foreign class for foreign key";
61 # FIXME - this check needs to be moved to schema-composition time...
62 # # only perform checks if the far side was not preloaded above *AND*
63 # # appears to have been loaded by something else (has a rsrc)
64 # if (! $f_rsrc and $f_rsrc = dbic_internal_try { $f_class->result_source }) {
65 # $class->throw_exception(
66 # "No such column '$f_key' on foreign class ${f_class} ($guess)"
67 # ) if !$f_rsrc->has_column($f_key);
70 $cond = { "foreign.${f_key}" => "self.${pri}" };
72 $class->_validate_has_one_condition($cond);
74 my $default_cascade = ref $cond eq 'CODE' ? 0 : 1;
76 $class->add_relationship($rel, $f_class,
78 { accessor => 'single',
79 cascade_update => $default_cascade,
80 cascade_delete => $default_cascade,
82 ($join_type ? ('join_type' => $join_type) : ()),
87 sub _validate_has_one_condition {
88 my ($class, $cond ) = @_;
90 return if $ENV{DBIC_DONT_VALIDATE_RELS};
91 return unless 'HASH' eq ref $cond;
92 foreach my $foreign_id ( keys %$cond ) {
93 my $self_id = $cond->{$foreign_id};
95 # we can ignore a bad $self_id because add_relationship handles this
97 return unless $self_id =~ /^self\.(.*)$/;
101 my $column_info = $class->result_source->columns_info->{$key}
102 or $class->throw_exception(
103 "Defining rel on ${class} that includes '$key' "
104 . 'but no such column defined there yet'
108 "'might_have'/'has_one' must not be used on columns with is_nullable "
109 . "set to true ($class/$key). This almost certainly indicates an "
110 . "incorrect use of these relationship helpers instead of 'belongs_to'"
111 ) if $column_info->{is_nullable};