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package # hide from PAUSE
DBIx::Class::Relationship::HasOne;
use strict;
use warnings;
sub might_have {
shift->_has_one('LEFT' => @_);
}
sub has_one {
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_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}" };
}
$class->add_relationship($rel, $f_class,
$cond,
{ accessor => 'single',
cascade_update => 1, cascade_delete => 1,
($join_type ? ('join_type' => $join_type) : ()),
%{$attrs || {}} });
1;
}
1;
|
