many to many relationship laravel

1// in User model:
2<?php
3
4namespace App;
5
6use Illuminate\Database\Eloquent\Model;
7
8class User extends Model
9{
10    /**
11     * The roles that belong to the user.
12     */
13    public function roles()
14    {
15        return $this->belongsToMany('App\Role');
16    }
17}
18
19// in Role model:
20<?php
21
22namespace App;
23
24use Illuminate\Database\Eloquent\Model;
25
26class Role extends Model
27{
28    /**
29     * The users that belong to the role.
30     */
31    public function users()
32    {
33        return $this->belongsToMany('App\User')->using('App\UserRole');
34    }
35}

1For example, a blog post may have an infinite number of comments. And a single
2comment belongs to only a single post  
3
4class Post extends Model
5{
6    public function comments()
7    {
8        return $this->hasMany('App\Models\Comment');
9    }
10}
11
12class Comment extends Model
13{
14    public function post()
15    {
16        return $this->belongsTo('App\Models\Post');
17    }
18}

1use Illuminate\Database\Eloquent\Builder;
2
3// Retrieve posts with at least one comment containing words like code%...
4$posts = Post::whereHas('comments', function (Builder $query) {
5    $query->where('content', 'like', 'code%');
6})->get();
7
8// Retrieve posts with at least ten comments containing words like code%...
9$posts = Post::whereHas('comments', function (Builder $query) {
10    $query->where('content', 'like', 'code%');
11}, '>=', 10)->get();

1// Detach a single role from the user...
2$user->roles()->detach($roleId);
3
4// Detach all roles from the user...
5$user->roles()->detach();

1$user->roles()->attach($roleIds);
2$user->roles()->detach($roleIds);
3$user->roles()->sync($roleIds);
4$user->roles()->toggle($roleIds);

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