Add getModel to Builder

[porozhnyy]

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Fix not exists getModel method in Builder

[babenkoivan]

Why do you need it in Builder? What's the use case?

[porozhnyy]

@babenkoivan I use 2 types of filters in my application - ES and Postgresql. Depending on whether there is a search method in the model or not, I further define the search logic. So far I have to use this code, which is not very beautiful:

private function getModel($builder)
{
    if (!($builder instanceof Illuminate\Database\Eloquent\Builder)) {
        return $builder->model;
    }

    return $builder->getModel();
}

if (method_exists($this->getModel($builder), 'search')) {
    //my code
}

[porozhnyy]

This is a typo of the century)))