-package DBIx::Class::Relationship::BelongsTo;
+package # hide from PAUSE
+ DBIx::Class::Relationship::BelongsTo;
+
+# Documentation for these methods can be found in
+# DBIx::Class::Relationship
use strict;
use warnings;
sub belongs_to {
my ($class, $rel, $f_class, $cond, $attrs) = @_;
- eval "require $f_class";
- if ($@) {
- $class->throw_exception($@) unless $@ =~ /Can't locate/;
- }
-
- my %f_primaries;
- $f_primaries{$_} = 1 for eval { $f_class->primary_columns };
- my $f_loaded = !$@;
-
- # single key relationship
+ # no join condition or just a column name
if (!ref $cond) {
- $class->throw_exception("Can't infer join condition for ${rel} on ${class}; unable to load ${f_class}")
- unless $f_loaded;
+ $class->ensure_class_loaded($f_class);
+ my %f_primaries = map { $_ => 1 } eval { $f_class->primary_columns };
+ $class->throw_exception(
+ "Can't infer join condition for ${rel} on ${class}; ".
+ "unable to load ${f_class}: $@"
+ ) if $@;
my ($pri, $too_many) = keys %f_primaries;
- $class->throw_exception("Can't infer join condition for ${rel} on ${class}; ${f_class} has no primary keys")
- unless defined $pri;
- $class->throw_exception("Can't infer join condition for ${rel} on ${class}; ${f_class} has multiple primary key")
- if $too_many;
+ $class->throw_exception(
+ "Can't infer join condition for ${rel} on ${class}; ".
+ "${f_class} has no primary keys"
+ ) unless defined $pri;
+ $class->throw_exception(
+ "Can't infer join condition for ${rel} on ${class}; ".
+ "${f_class} has multiple primary keys"
+ ) if $too_many;
my $fk = defined $cond ? $cond : $rel;
- $class->throw_exception("Can't infer join condition for ${rel} on ${class}; $fk is not a column")
- unless $class->has_column($fk);
+ $class->throw_exception(
+ "Can't infer join condition for ${rel} on ${class}; ".
+ "$fk is not a column of $class"
+ ) unless $class->has_column($fk);
my $acc_type = $class->has_column($rel) ? 'filter' : 'single';
$class->add_relationship($rel, $f_class,
{ accessor => $acc_type, %{$attrs || {}} }
);
}
- # multiple key relationship
+ # explicit join condition
elsif (ref $cond eq 'HASH') {
my $cond_rel;
for (keys %$cond) {
}
$cond_rel->{"foreign.$_"} = "self.".$cond->{$_};
}
- my $acc_type = (keys %$cond_rel == 1 and $class->has_column($rel)) ? 'filter' : 'single';
+ my $acc_type = (keys %$cond_rel == 1 and $class->has_column($rel))
+ ? 'filter'
+ : 'single';
$class->add_relationship($rel, $f_class,
$cond_rel,
{ accessor => $acc_type, %{$attrs || {}} }
);
}
else {
- $class->throw_exception('third argument for belongs_to must be undef, a column name, or a join condition');
+ $class->throw_exception(
+ 'third argument for belongs_to must be undef, a column name, '.
+ 'or a join condition'
+ );
}
return 1;
}