Laravel - How to access related object other relashionship

I have 3 Models "Category", "Post", and "User". A Category has a hasMany relationship with Post. And a Post has a belongsTo relationship with User.

I have a Category object $cat1 and i can access its posts (and the user_id) in my view, but i can't access more user data (line name)

@foreach ($cat1->posts as $post)
    
    
@endforeach

This throws an error

Undefined property: Illuminate\Database\Eloquent\Relations\BelongsTo::$name

via Chebli Mohamed