-package DBIx::Class::Relationship::HasMany;
+package # hide from PAUSE
+ DBIx::Class::Relationship::HasMany;
use strict;
use warnings;
+use Try::Tiny;
+use namespace::clean;
+
+our %_pod_inherit_config =
+ (
+ class_map => { 'DBIx::Class::Relationship::HasMany' => 'DBIx::Class::Relationship' }
+ );
sub has_many {
my ($class, $rel, $f_class, $cond, $attrs) = @_;
-
- eval "require $f_class";
- if (!ref $cond) {
- my $f_key;
+ unless (ref $cond) {
+ $class->ensure_class_loaded($f_class);
+ my ($pri, $too_many) = try { $class->_pri_cols }
+ catch {
+ $class->throw_exception("Can't infer join condition for ${rel} on ${class}: $_");
+ };
+
+ $class->throw_exception(
+ "has_many can only infer join for a single primary key; ".
+ "${class} has more"
+ ) if $too_many;
+
+ $class->throw_exception(
+ "has_many needs a primary key to infer a join; ".
+ "${class} has none"
+ ) if !defined $pri && (!defined $cond || !length $cond);
+
+ my ($f_key,$guess);
if (defined $cond && length $cond) {
$f_key = $cond;
- $class->throw( "No such column ${f_key} on foreign class ${f_class}" )
- unless ($@ || $f_class->_columns->{$f_key});
+ $guess = "caller specified foreign key '$f_key'";
} else {
$class =~ /([^\:]+)$/;
- $f_key = lc $1 if $f_class->_columns->{lc $1};
- $class->throw( "Unable to resolve foreign key for has_many from ${class} to ${f_class}" )
- unless $f_key;
+ $f_key = lc $1; # go ahead and guess; best we can do
+ $guess = "using our class name '$class' as foreign key";
}
- my ($pri, $too_many) = keys %{ $class->_primaries };
- $class->throw( "has_many can only infer join for a single primary key; ${class} has more" )
- if $too_many;
- $cond = { "foreign.${f_key}" => "self.${pri}" },
+
+ my $f_class_loaded = try { $f_class->columns };
+ $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, $cond,
- { accessor => 'multi',
- join_type => 'LEFT',
- cascade_delete => 1,
- %{$attrs||{}} } );
+ $class->add_relationship($rel, $f_class, $cond, {
+ accessor => 'multi',
+ join_type => 'LEFT',
+ cascade_delete => 1,
+ cascade_copy => 1,
+ %{$attrs||{}}
+ });
}
1;