Convert manual _id's to MongoId objects, fixes #225

src/Jenssegers/Mongodb/Model.php

@@ -42,11 +42,13 @@ abstract class Model extends \Jenssegers\Eloquent\Model {
      */
     public function getIdAttribute($value)
     {
-        // If there is an actual id attribute, then return that.
-        if ($value) return $value;
+        if ($value) return (string) $value;
 
-        // Return primary key value if present
-        if (array_key_exists($this->getKeyName(), $this->attributes)) return $this->attributes[$this->getKeyName()];
+        // Return _id as string
+        if (array_key_exists('_id', $this->attributes))
+        {
+            return (string) $this->attributes['_id'];
+        }
     }
 
     /**
@@ -194,23 +196,23 @@ abstract class Model extends \Jenssegers\Eloquent\Model {
     }
 
     /**
-     * Get an attribute from the model.
+     * Set a given attribute on the model.
      *
      * @param  string  $key
-     * @return mixed
+     * @param  mixed   $value
+     * @return void
      */
-    public function getAttribute($key)
+    public function setAttribute($key, $value)
     {
-        $attribute = parent::getAttribute($key);
-
-        // If the attribute is a MongoId object, return it as a string.
-        // This is makes Eloquent relations a lot easier.
-        if ($attribute instanceof MongoId)
+        // Convert _id to MongoId.
+        if ($key == '_id' and is_string($value))
         {
-            return (string) $attribute;
+            $this->attributes[$key] = new MongoId($value);
+        }
+        else
+        {
+            parent::setAttribute($key, $value);
         }
-
-        return $attribute;
     }
 
     /**

tests/ModelTest.php

@@ -79,6 +79,22 @@ class ModelTest extends TestCase {
 		$this->assertEquals(20, $check->age);
 	}
 
+	public function testManualId()
+	{
+		$user = new User;
+		$user->_id = '4af9f23d8ead0e1d32000000';
+		$user->name = 'John Doe';
+		$user->title = 'admin';
+		$user->age = 35;
+		$user->save();
+
+		$this->assertEquals(true, $user->exists);
+		$this->assertEquals('4af9f23d8ead0e1d32000000', $user->_id);
+
+		$raw = $user->getAttributes();
+		$this->assertInstanceOf('MongoId', $raw['_id']);
+	}
+
 	public function testDelete()
 	{
 		$user = new User;