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 {
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 = $class->_get_primary_key;
$class->throw_exception(
"might_have/has_one needs a primary key to infer a join; ".
"${class} has none"
) if !defined $pri && (!defined $cond || !length $cond);
my $f_class_loaded = try { $f_class->columns };
my ($f_key,$too_many,$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 = $class->_get_primary_key($f_class);
$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}" };
}
$class->_validate_has_one_condition($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 => $default_cascade,
($join_type ? ('join_type' => $join_type) : ()),
%{$attrs || {}} });
1;
}
sub _get_primary_key {
my ( $class, $target_class ) = @_;
$target_class ||= $class;
my ($pri, $too_many) = try { $target_class->_pri_cols }
catch {
$class->throw_exception("Can't infer join condition on ${target_class}: $_");
};
$class->throw_exception(
"might_have/has_one can only infer join for a single primary key; ".
"${class} has more"
) if $too_many;
return $pri;
}
sub _validate_has_one_condition {
my ($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
# warning
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.');
}
}
}
1;