Simplify the logic to throw an error on an undef or ! blessed delegatee.

Add a test for undef in the delegatee slot.

diff --git a/lib/Moose/Meta/Method/Delegation.pm b/lib/Moose/Meta/Method/Delegation.pm
index aa146f4..04cab20 100644 (file)
--- a/lib/Moose/Meta/Method/Delegation.pm
+++ b/lib/Moose/Meta/Method/Delegation.pm
@@ -79,24 +79,23 @@ sub _initialize_body {
     $self->{body} = sub {
         my $instance = shift;
         my $proxy    = $instance->$accessor();
-        ( defined $proxy )
-            || $self->throw_error(
-            "Cannot delegate $handle_name to $method_to_call because "
-                . "the value of "
-                . $self->associated_attribute->name
-                . " is not defined",
-            method_name => $method_to_call,
-            object      => $instance
-            );
-        ( blessed $proxy )
-            || $self->throw_error(
-            "Cannot delegate $handle_name to $method_to_call because "
-                . "the value of "
-                . $self->associated_attribute->name
-                . " is not an object (got '$proxy')",
-            method_name => $method_to_call,
-            object      => $instance
+
+        my $error
+            = !defined $proxy ? ' is not defined'
+            : !blessed $proxy ? qq{ is not an object (got '$proxy')}
+            :                   undef;
+
+        if ($error) {
+            $self->throw_error(
+                "Cannot delegate $handle_name to $method_to_call because "
+                    . "the value of "
+                    . $self->associated_attribute->name
+                    . $error,
+                method_name => $method_to_call,
+                object      => $instance
             );
+        }
+
         $proxy->$method_to_call(@_);
     };
 }

diff --git a/t/020_attributes/010_attribute_delegation.t b/t/020_attributes/010_attribute_delegation.t
index 84890b9..eb05ac7 100644 (file)
--- a/t/020_attributes/010_attribute_delegation.t
+++ b/t/020_attributes/010_attribute_delegation.t
@@ -3,7 +3,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 89;
+use Test::More tests => 90;
 use Test::Exception;
 
 
@@ -413,7 +413,11 @@ is($car->stop, 'Engine::stop', '... got the right value from ->stop');
 # Make sure that a useful error message is thrown when the delegation target is
 # not an object
 {
-    my $i = Bar->new(foo => []);
-    throws_ok { $i->foo_bar } qr/is not an object \(got 'ARRAY/,
+    my $i = Bar->new(foo => undef);
+    throws_ok { $i->foo_bar } qr/is not defined/,
+        'useful error from unblessed reference';
+
+    my $j = Bar->new(foo => []);
+    throws_ok { $j->foo_bar } qr/is not an object \(got 'ARRAY/,
         'useful error from unblessed reference';
 }