How to delete categories of user? - laravel

Question

I try to delete categories of user like as:
Category::with('user', Auth::user()->id)->where("user_id", $id)->delete();
Category model has relationship:
public function user()
{
return $this->belongsTo('App\User', 'user_id', 'id');
}
But it does not work for me
User model:
public function categories()
{
return $this->belongsToMany('App\Category');
}

Answer 1

Try without with():
Category::where("user_id", $id)->delete();
Update after the User model code addition:
The inverse of a belongsToMany relation is another belongsToMany, the inverse of a belongsTo is a hasMany or a hasOne.
You have to decide which relations between User and Category you want, because a belongsTo doesn't work with an inverse belongsToMany.
From what you wrote in answer and comments seems that you want a Many to many relationship (you have an intermediate table) in this case you have to use belongsToMany in both models and then you can use this code to delete user categories assignement:
$user->categories()->detach()

Answer 2

I think you need to flesh out how they will relate. Right now, based on your relationship code, the Categories table should have an user_id in it.
This is what the relationship on the Category model should look like:
public function users()
{
return $this->belongsToMany(User::class);
}
And you need a table with the name category_user to make the relationship work. Here's an example of what the migration would look like:
Schema::create('category_user', function (Blueprint $table) {
$table->increments('id');
$table->integer('category_id')->unsigned();
$table->integer('user_id')->unsigned();
$table->timestamps();
$table->foreign('category_id')->references('id')->on('categories');
$table->foreign('user_id')->references('id')->on('users');
})
Then you'd be able to add users to categories in the following ways:
$category->users()->attach(Auth::id());
Auth::user()->categories()->attach([ 1, 2, 3 ... ]);
And remove:
$category->users()->detach(Auth::id());
Auth::user()->categories()->detach([ 1, 2, 3 ... ]);
You can also use sync which would detach any element not on your array and attach any element not currently attached:
Auth::user()->categories()->sync([ 1, 2, 3, ... ]);