1 to many relationship in laravel

1class Post extends Model
2{
3   // 1 Post has many comments
4    public function comments()
5    {
6        return $this->hasMany(Comment::class);
7    }
8}

1use App\Models\User;
2
3$user = User::find(1);
4
5$user->roles()->attach($roleId);

1/*
2users
3    id - integer
4    name - string
5
6roles
7    id - integer
8    name - string
9
10role_user
11    user_id - integer
12    role_id - integer
13*/
14
15class User extends Model
16{
17    /**
18     * The roles that belong to the user.
19     */
20    public function roles()
21    {
22      /*To determine the table name of the relationship's intermediate 
23      table, Eloquent will join the two related model names in 
24      alphabetical order. However, you are free to override this 
25      convention. You may do so by passing a second argument to the 
26      belongsToMany method*/
27        return $this->belongsToMany(Role::class,'role_user');
28    }
29}
30//Defining The Inverse Of The Relationship
31
32class Role extends Model
33{
34    /**
35     * The users that belong to the role.
36     */
37    public function users()
38    {
39        return $this->belongsToMany(User::class);
40    }
41}