我可以将一个 Eloquent model 投射到另一个上吗？

Question

In eloquent you can have different models operating on a same table. So, is it possible to switch an object from one Model to another in a runtime. Assuming that we have three classes:

Product extends Model
ProductSet extends Product
SimpleProduct extends Product

The difference between ProductSet and a SimpleProduct is column complex which has 'true' in it for a ProductSet and 'false' for a SimpleProduct.

ProductSet and a SimpleProduct models have Scopes applied to them so that ProductSet::all() will get only sets, and SimpleProduct::all() will get only a simple products.

Parent model however allow us to get both types of products via Product::all() so, is it possible to go through all instances of Product class and switch them to their higher level models at runtime based on a value of property complex ?

Answer 1

Since you're already extending the class which holds the same props as the parent. You can loop over any product collection and get all the attributes through getAttributes() method and pass to the parent. Because each of your model is extending Eloquent Model which accepts attribute in the constructor and fills its attribute.

Following example extends the default User class and converts back to the Parent class

<?php

namespace App;

class Admin extends User {}

Get all Admins and convert them to User

$admins = \App\Admin::all();

$users = [];
foreach ($admins as $admin) {
    $users[] = new \App\User($admin->getAttributes());
}
dd(collect($users));

Answer 2

Yes you can do that, Based on the prop you have to create object of that specific class