laravel poly morphic relationship

1<?php
2
3namespace App;
4
5use Illuminate\Database\Eloquent\Model;
6
7class Image extends Model
8{
9    /**
10     * Get the owning imageable model.
11     */
12    public function imageable()
13    {
14        return $this->morphTo();
15    }
16}
17
18class Post extends Model
19{
20    /**
21     * Get the post's image.
22     */
23    public function image()
24    {
25        return $this->morphOne('App\Image', 'imageable');
26    }
27}
28
29class User extends Model
30{
31    /**
32     * Get the user's image.
33     */
34    public function image()
35    {
36        return $this->morphOne('App\Image', 'imageable');
37    }
38}

1class Mechanic extends Model
2{
3    /**
4     * Get the car's owner.
5     */
6    public function carOwner()
7    {
8        return $this->hasOneThrough(
9            'App\Owner',
10            'App\Car',
11            'mechanic_id', // Foreign key on cars table...
12            'car_id', // Foreign key on owners table...
13            'id', // Local key on mechanics table...
14            'id' // Local key on cars table...
15        );
16    }
17}