Laravel eloquent extending model

Question

I have default user model. Now I have another table for Administrators. Is there a way to return user fields (since admin is extending user) from admin model ? I found this example but its when admin_id is present in user model. I have one-to-one relation here.

class Admin extends User
{
    protected $table = 'users';

    public static function boot()
    {
        parent::boot();

        static::addGlobalScope(function ($query) {
            $query->where('is_admin', true);
        });
    }
}

This is the example I found. I'm not sure how can I return user fields from my admin model when its on different table.

The point is I want to be able to do something like this (call methods from users):

Admin::first()->posts()

Where posts method is not on Admin class but on user class.

Edit:

To explain it better. I have two tables, users and admins. They are connected in one-to-one relationship so I can do something like this:

$admin = Admin::first();
$posts = $admin->user()->posts();

but since Admin should have all fields from users table and one more field from admins table I'm looking for a way to do this:

$admin = Admin::first();
$posts = $admin->posts();

I don't want to add admin or something to users table, I still want to use admins table since I will need more fields there later.

Answer 1

If both tables have an equal id, use a trait to define your relationships:

trait UserRelationships {
    public function posts() {
         return $this->hasMany(Post::class, 'user_id');
    }
}

class Admin {
    use UserRelationships;
}

class User {
    use UserRelationships;
}

You'll just have to be sure to explicitly declare the foreign key name in the relationship.

You could also extend the User model and override the $table property but this may present problems for various reasons since User properties exist on the user relationship and not on the Admin model.