public function deleteMeta($key, $value = null)
    {
        return $value
            ? $this->meta()->where('key', $key)->where('value', $value)->delete()
            : $this->meta()->where('key', $key)->delete();
    }
public function deleteMeta($key, $value = null)
    {
        return $value
            ? $this->meta()->where('key', $key)->where('value', $value)->delete()
            : $this->meta()->where('key', $key)->delete();
    }
public function deleteMeta ( $ key , $ value = null ) { return $ value ? $ this -> meta ( ) -> where ( 'key' , $ key ) -> where ( 'value' , $ value ) -> delete ( ) : $ this -> meta ( ) -> where ( 'key' , $ key ) -> delete ( ) ; }
Delete meta.

@param  string $key
@param  mixed $value
@return bool
Delete meta .