Devise\Pages\Interpreter\DvsPageData::extractModelFromKey PHP Метод

    protected function extractModelFromKey($chain)
    {
        $chain = is_array($chain) ? $chain : array($chain);
        $iterator = new \ArrayIterator($chain);
        $model = $iterator->current();
        // we cant do anything with null models so throw an error
        if (is_null($model)) {
            $variableName = $iterator->key();
            throw new Exceptions\InvalidDeviseTagException("Cannot use '{$variableName}'' as a devise model because it is null");
        }
        // make sure this model is a model
        if (is_a($model, '\\Illuminate\\Database\\Eloquent\\Model')) {
            return array($model, null);
        }
        // didn't find the model so maybe it is an attribute
        // of a specific model, so advance the iterator
        $attribute = $iterator->key();
        $iterator->next();
        $model = $iterator->valid() ? $iterator->current() : null;
        // let's try this again
        if (is_a($model, '\\Illuminate\\Database\\Eloquent\\Model')) {
            return array($model, $attribute);
        }
        throw new Exceptions\InvalidDeviseTagException('Could not extract Eloquent model from devise tag');
    }