In which Controller should I write logic for Models that are in a relationship

Question

I am making a blog with users who each have posts. Naturally, I have a UserController, PostController, and a User and Post model.

The User model has a one-to-many relationship with the Post model like so

// User Model
public function posts()
    {
        return $this->hasMany('App\Post');
    }

I would like to get all the posts of a specific user by using

// UserController or PostController...
$posts = User::find($id)->posts()->get()

Should I write this logic in my UserController (because it uses the User model) or should I write the logic in my PostController (because it returns posts)?

Answer 1

Actually, you just need to create the relationship as you did, and then you will be able call it wherever you want, just like as you described, with User::find($id)->posts()->get().

So, if you need to return a user's post on a view, for instance, you can do something like that on your UserController:

public function postsView(User $user)
{
    $posts = $user->posts()->get();
    return view('user.posts', compact('posts'));
}

Also, if you want the other way around (to know who is the user behind the post), you can create a relationship on your Post model using belongsTo().

// Post Model
public function user()
{
    return $this->belongsTo('App\User');
}