Update MorphTo to enable polymorphic eager loading

src/LaravelBook/Ardent/Ardent.php

@@ -13,6 +13,7 @@
 use Illuminate\Container\Container;
 use Illuminate\Database\Capsule\Manager as DatabaseCapsule;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
 use Illuminate\Events\Dispatcher;
 use Illuminate\Support\MessageBag;
 use Illuminate\Support\Facades\Input;
@@ -410,14 +411,29 @@ public function morphTo($name = null, $type = null, $id = null) {
 			$name = snake_case($caller['function']);
 		}
 
-		// Next we will guess the type and ID if necessary. The type and IDs may also
-		// be passed into the function so that the developers may manually specify
-		// them on the relations. Otherwise, we will just make a great estimate.
 		list($type, $id) = $this->getMorphs($name, $type, $id);
 
-		$class = $this->$type;
+		// If the type value is null it is probably safe to assume we're eager loading
+		// the relationship. When that is the case we will pass in a dummy query as
+		// there are multiple types in the morph and we can't use single queries.
+		if (is_null($class = $this->$type))
+		{
+			return new MorphTo(
+				$this->newQuery(), $this, $id, null, $type, $name
+			);
+		}
 
-		return $this->belongsTo($class, $id);
+		// If we are not eager loading the relatinship, we will essentially treat this
+		// as a belongs-to style relationship since morph-to extends that class and
+		// we will pass in the appropriate values so that it behaves as expected.
+		else
+		{
+			$instance = new $class;
+
+			return new MorphTo(
+				with($instance)->newQuery(), $this, $id, $instance->getKeyName(), $type, $name
+			);
+		}
 	}
 
     /**