-package DBIx::Class::Relationship::HasOne;
+package # hide from PAUSE
+ DBIx::Class::Relationship::HasOne;
use strict;
use warnings;
+use Carp::Clan qw/^DBIx::Class/;
+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, $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 => $acc_type }
- );
+ shift->_has_one(undef() => @_);
+}
+
+sub _has_one {
+ my ($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}" };
}
- # 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: $_");
- }
+ $class->_validate_has_one_condition($cond);
+ $class->add_relationship($rel, $f_class,
+ $cond,
+ { accessor => 'single',
+ cascade_update => 1, cascade_delete => 1,
+ ($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.');
}
- $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' }
- );
}
- return 1;
}
1;