fixed a memory leak when using validations

lib/Validations.php

@@ -136,6 +136,7 @@ public function validate()
 		foreach ($this->validators as $validate)
 			$this->$validate($reflection->getStaticPropertyValue($validate));
 
+		$this->record->clear_model();
 		return $this->record;
 	}
 
@@ -643,6 +644,15 @@ public function __construct(Model $model)
 		$this->model = $model;
 	}
 
+	/**
+	 * Nulls $model so we don't get pesky circular references. $model is only needed during the
+	 * validation process and so can be safely cleared once that is done.
+	 */
+	public function clear_model()
+	{
+		$this->model = null;
+	}
+
 	/**
 	 * Add an error message.
 	 *

test/ValidationsTest.php

@@ -114,5 +114,12 @@ public function test_get_validation_rules()
 		$validators = BookValidations::first()->get_validation_rules();
 		$this->assert_true(in_array(array('validator' => 'validates_presence_of'),$validators['name']));
 	}
+
+	public function test_model_is_nulled_out_to_prevent_memory_leak()
+	{
+		$book = new BookValidations();
+		$book->is_valid();
+		$this->assert_true(strpos(serialize($book->errors),'model";N;') !== false);
+	}
 };
 ?>