LMongo\Eloquent\Model::morphTo PHP Method

    public function morphTo($name = null, $type = null, $id = null)
    {
        // If no name is provided, we will use the backtrace to get the function name
        // since that is most likely the name of the polymorphic interface. We can
        // use that to get both the class and foreign key that will be utilized.
        if (is_null($name)) {
            list(, $caller) = debug_backtrace(false);
            $name = snake_case($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};
        return $this->belongsTo($class, $id);
    }