-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 {
- shift->_has_one(undef => @_);
+ shift->_has_one(undef() => @_);
}
sub _has_one {
my ($class, $join_type, $rel, $f_class, $cond, $attrs) = @_;
- eval "require $f_class";
unless (ref $cond) {
- my ($pri, $too_many) = keys %{ $class->_primaries };
- $class->throw( "might_have/has_one can only infer join for a single primary key; ${class} has more" )
- if $too_many;
- my $f_key;
- if ($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 = $cond;
- } elsif ($f_class->_columns->{$rel}) {
+ $guess = "caller specified foreign key '$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) = keys %{ $f_class->_primaries };
- $class->throw( "might_have/has_one can only infer join for a single primary key; ${f_class} has more" )
- if $too_many;
+ $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);
$class->add_relationship($rel, $f_class,
$cond,
{ accessor => 'single',
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;