-package DBIx::Class::Relationship::HasOne;
+package # hide from PAUSE
+ DBIx::Class::Relationship::HasOne;
use strict;
use warnings;
+sub might_have {
+ shift->_has_one('LEFT' => @_);
+}
+
sub has_one {
- my ($class, $acc_name, $f_class, $cond) = @_;
- eval "require $f_class";
- # single key relationship
- if (not defined $cond) {
- my ($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 $cond_rel;
- for (keys %$cond) {
- $cond_rel->{"foreign.$_"} = "self.".$cond->{$_};
- # primary key usage checks
- if (exists $f_primaries{$_}) {
- delete $f_primaries{$_};
- }
- else
- {
- $class->throw("non primary key used in join condition: $_");
- }
+ shift->_has_one(undef() => @_);
+}
+
+sub _has_one {
+ my ($class, $join_type, $rel, $f_class, $cond, $attrs) = @_;
+ unless (ref $cond) {
+ $class->ensure_class_loaded($f_class);
+ my ($pri, $too_many) = $class->primary_columns;
+ $class->throw_exception(
+ "might_have/has_one can only infer join for a single primary key; ".
+ "${class} has more"
+ ) if $too_many;
+ my $f_class_loaded = eval { $f_class->columns };
+ my ($f_key,$guess);
+ if (defined $cond && length $cond) {
+ $f_key = $cond;
+ $guess = "caller specified foreign key '$f_key'";
+ } elsif ($f_class_loaded && $f_class->has_column($rel)) {
+ $f_key = $rel;
+ $guess = "using given relationship '$rel' for foreign key";
+ } else {
+ ($f_key, $too_many) = $f_class->primary_columns;
+ $class->throw_exception(
+ "might_have/has_one can only infer join for a single primary key; ".
+ "${f_class} has more"
+ ) if $too_many;
+ $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,
- $cond_rel,
- { accessor => 'single' }
- );
+ $class->throw_exception(
+ "No such column ${f_key} on foreign class ${f_class} ($guess)"
+ ) if $f_class_loaded && !$f_class->has_column($f_key);
+ $cond = { "foreign.${f_key}" => "self.${pri}" };
}
- return 1;
+ $class->add_relationship($rel, $f_class,
+ $cond,
+ { accessor => 'single',
+ cascade_update => 1, cascade_delete => 1,
+ ($join_type ? ('join_type' => $join_type) : ()),
+ %{$attrs || {}} });
+ 1;
}
1;