Added support for push, fixes mongodb#20

Author: mnphpexpert

Diff for: README.md

@@ -243,6 +243,15 @@ Or you can access the internal object directly:
 
     User::raw()->find();
 
+### MongoDB specific operations
+
+***Push***
+
+Add one or more items to an array.
+
+    User::where('name', 'John')->push('items', 'boots');
+    User::where('name', 'John')->push('items', array('sword', 'shield'));
+
 ### Query Caching
 
 You may easily cache the results of a query using the remember method:

Diff for: src/Jenssegers/Mongodb/Builder.php

@@ -303,16 +303,7 @@ public function insertGetId(array $values, $sequence = null)
      */
     public function update(array $values)
     {
-        $update = array('$set' => $values);
-
-        $result = $this->collection->update($this->compileWheres(), $update, array('multiple' => true));
-
-        if (1 == (int) $result['ok'])
-        {
-            return $result['n'];
-        }
-
-        return 0;
+        return $this->performUpdate(array('$set' => $values));
     }
 
     /**
@@ -420,6 +411,31 @@ public function raw($expression = null)
         return $this->collection;
     }
 
+    /**
+     * Append a value to an array.
+     *
+     * @param  string  $column
+     * @param  mixed   $value
+     * @return int
+     */
+    public function push($column, $value = null)
+    {
+        if (is_array($column))
+        {
+            $query = array('$push' => $column);
+        }
+        else if (is_array($value))
+        {
+            $query = array('$push' => array($column => array('$each' => $value)));
+        }
+        else
+        {
+            $query = array('$push' => array($column => $value));
+        }
+
+        return $this->performUpdate($query);
+    }
+
     /**
      * Get a new instance of the query builder.
      *
@@ -430,6 +446,24 @@ public function newQuery()
         return new Builder($this->connection);
     }
 
+    /**
+     * Perform update.
+     *
+     * @param  array  $query
+     * @return int
+     */
+    protected function performUpdate($query)
+    {
+        $result = $this->collection->update($this->compileWheres(), $query, array('multiple' => true));
+
+        if (1 == (int) $result['ok'])
+        {
+            return $result['n'];
+        }
+
+        return 0;
+    }
+
     /**
     * Compile the where array
     *

Diff for: tests/QueryTest.php

@@ -101,4 +101,31 @@ public function testRaw()
 		$this->assertInstanceOf('MongoCollection', $collection);
 	}
 
+	public function testPush()
+	{
+		$user = array('name' => 'John Doe', 'tags' => array());
+		$id = DB::collection('users')->insertGetId($user);
+
+		DB::collection('users')->where('_id', $id)->push('tags', 'tag1');
+		$user = DB::collection('users')->find($id);
+
+		$this->assertTrue(is_array($user['tags']));
+		$this->assertEquals(1, count($user['tags']));
+		$this->assertEquals('tag1', $user['tags'][0]);
+
+		DB::collection('users')->where('_id', $id)->push('tags', 'tag2');
+		$user = DB::collection('users')->find($id);
+
+		$this->assertTrue(is_array($user['tags']));
+		$this->assertEquals(2, count($user['tags']));
+		$this->assertEquals('tag2', $user['tags'][1]);
+
+		DB::collection('users')->where('_id', $id)->push('tags', array('tag3', 'tag4'));
+		$user = DB::collection('users')->find($id);
+
+		$this->assertTrue(is_array($user['tags']));
+		$this->assertEquals(4, count($user['tags']));
+		$this->assertEquals('tag4', $user['tags'][3]);
+	}
+
 }