php – How to retrieve categories linked to a post?

Question:

I went up on Github ( https://github.com/fabiojaniolima/larablog-beta ) a small project in Laravel, something very initial. I want to organize the routes, structure the methods, etc. as soon as possible.

I released this premature code because I ran into a problem that I'm not able to solve by myself. I explain below.

I set up a Categories scheme, this scheme will be used by the Library, Courses and Posts screen. I'm already managing to register the categories and also link a post to more than one category, as well as undo the relationship (post <=> category) when deleting the post. The problem is when editing a post, I'm not able to reassemble the entire structure of categories at the moment, pre-selecting those linked to the post.

The method used to edit the post is located at App\Http\Controllers\Panel\PostController:

public function edit(Post $post)
{
    $categorias = Categoria::all()->toHierarchy();

    return view('painel.posts.cad-edit', compact('post', 'categorias'));
}

I've known Laravel for a short time, so I don't know very well how it works. At the end of this project I will release it under an MIT license, as well as use this to make some of my books, articles and courses available for free.

The idea of ​​categories is something like: imgur.com/a/itX71

Answer:

If you want to list the categories related to the post. You can call the model's method that tells you who the categories are associated with it.

Type:

public function edit(Post $post)
{
    $categorias = Post::find($id)->categorias;

    return view('painel.posts.cad-edit', compact('post', 'categorias'));
}

in this way it will return the categories related to this specific post!