-package DBIx::Class::Relationship::HasOne;
+package # hide from PAUSE
+ DBIx::Class::Relationship::HasOne;
use strict;
use warnings;
+use DBIx::Class::Carp;
+use Try::Tiny;
+use namespace::clean;
+
+our %_pod_inherit_config =
+ (
+ class_map => { 'DBIx::Class::Relationship::HasOne' => 'DBIx::Class::Relationship' }
+ );
+
+sub might_have {
+ shift->_has_one('LEFT' => @_);
+}
sub has_one {
- my ($class, $acc_name, $f_class, $conds, $args) = @_;
- eval "require $f_class";
- # single key relationship
- if (not defined $conds && not defined $args) {
- my ($pri, $too_many) = keys %{ $f_class->_primaries };
- my $acc_type = ($class->_columns->{$acc_name}) ? 'filter' : 'single';
- $class->add_relationship($acc_name, $f_class,
- { "foreign.${pri}" => "self.${acc_name}" },
- { accessor => $acc_type }
- );
- }
- # multiple key relationship
- else {
- my %f_primaries = %{ $f_class->_primaries };
- my $conds_rel;
- for (keys %$conds) {
- $conds_rel->{"foreign.$_"} = "self.".$conds->{$_};
- # primary key usage checks
- if (exists $f_primaries{$_}) {
- delete $f_primaries{$_};
+ shift->_has_one(undef() => @_);
+}
+
+sub _has_one {
+ my ($class, $join_type, $rel, $f_class, $cond, $attrs) = @_;
+ unless (ref $cond) {
+ my $pri = $class->result_source_instance->_single_pri_col_or_die;
+
+ my ($f_key,$guess,$f_rsrc);
+ if (defined $cond && length $cond) {
+ $f_key = $cond;
+ $guess = "caller specified foreign key '$f_key'";
+ }
+ else {
+ # at this point we need to load the foreigner, expensive or not
+ $class->ensure_class_loaded($f_class);
+
+ $f_rsrc = try {
+ my $r = $f_class->result_source_instance;
+ die "There got to be some columns by now... (exception caught and rewritten by catch below)"
+ unless $r->columns;
+ $r;
+ }
+ catch {
+ $class->throw_exception(
+ "Foreign class '$f_class' does not seem to be a Result class "
+ . "(or it simply did not load entirely due to a circular relation chain)"
+ );
+ };
+
+ if ($f_rsrc->has_column($rel)) {
+ $f_key = $rel;
+ $guess = "using given relationship name '$rel' as foreign key column name";
}
- else
- {
- $class->throw("non primary key used in join condition: $_");
+ else {
+ $f_key = $f_rsrc->_single_pri_col_or_die;
+ $guess = "using primary key of foreign class for foreign key";
}
}
- $class->throw("not all primary keys used in multi key relationship!") if keys %f_primaries;
- $class->add_relationship($acc_name, $f_class,
- $conds_rel,
- { accessor => 'single' }
- );
+
+# FIXME - this check needs to be moved to schema-composition time...
+# # only perform checks if the far side was not preloaded above *AND*
+# # appears to have been loaded by something else (has a rsrc_instance)
+# if (! $f_rsrc and $f_rsrc = try { $f_class->result_source_instance }) {
+# $class->throw_exception(
+# "No such column '$f_key' on foreign class ${f_class} ($guess)"
+# ) if !$f_rsrc->has_column($f_key);
+# }
+
+ $cond = { "foreign.${f_key}" => "self.${pri}" };
+ }
+ $class->_validate_has_one_condition($cond);
+
+ my $default_cascade = ref $cond eq 'CODE' ? 0 : 1;
+
+ $class->add_relationship($rel, $f_class,
+ $cond,
+ { accessor => 'single',
+ cascade_update => $default_cascade,
+ cascade_delete => $default_cascade,
+ is_depends_on => 0,
+ ($join_type ? ('join_type' => $join_type) : ()),
+ %{$attrs || {}} });
+ 1;
+}
+
+sub _validate_has_one_condition {
+ my ($class, $cond ) = @_;
+
+ return if $ENV{DBIC_DONT_VALIDATE_RELS};
+ return unless 'HASH' eq ref $cond;
+ foreach my $foreign_id ( keys %$cond ) {
+ my $self_id = $cond->{$foreign_id};
+
+ # we can ignore a bad $self_id because add_relationship handles this
+ # exception
+ return unless $self_id =~ /^self\.(.*)$/;
+
+ my $key = $1;
+ $class->throw_exception("Defining rel on ${class} that includes '$key' but no such column defined here yet")
+ unless $class->has_column($key);
+ my $column_info = $class->column_info($key);
+ if ( $column_info->{is_nullable} ) {
+ carp(qq'"might_have/has_one" must not be on columns with is_nullable set to true ($class/$key). This might indicate an incorrect use of those relationship helpers instead of belongs_to.');
+ }
}
- return 1;
}
1;