Laravel - Eloquent - query many to many relationship

Example: 

Table 1: posts

Table 2: categories

Pivot Table: category_post with foreign keys category_id, post_id

Model File: Post.php
---------------

```
.....
public function categories()
{
    return $this->belongsToMany('App\Categories','category_post','post_id','category_id');
}
```

Model File: Category.php
------------------------

```
.....
    public function posts()
    {
        return $this->belongsToMany('App\Posts','category_post','category_id','post_id');
    }    
```    
    

Eloquent in Controller
----------------------

So below Eloquent will fetch 5 records where categoty_id = 11

```
.....
     		$posts = Posts::whereHas('categories', function($q) use($slug){

    			               $q->where('id', 11); //this refers id field from categories table

		             })
                 ->where('type','post')
                 ->where('active',1)
                 ->orderBy('post_date','desc')
                 ->paginate(5);
```