2015-07-02 17:30
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Laravel 5:如何使用Eloquent查询数据透视表

Is there a way to use Eloquent to query a pivot table without having a model for that pivot table?

Situation: a user can own multiple businesses, and a business can be owned by multiple users. I have the following tables to deal with the many-to-many relationship.

| users     | businesses  | business_user |
| id        | id          | business_id   |
| name      | name        | user_id       |
| created_at| created_at  | created_at    |
| updated_at| updated_at  | updated_at    |

My User.php model

public function businesses()
    return $this->belongsToMany('App\Business')->withTimestamps();

My Business.php model

public function users()
    return $this->belongsToMany('App\User')->withTimestamps();

1- In my controller, i'm trying to query the business_user (pivot) table to count the number of businesses the Auth user Id has.

select count(*) from business_user where user_id = Auth::user()->id() ;

2- I'm trying to query the business_user (pivot) table to get the business name for each row found in table business_user for that user id.

select business_user.business_id, businesses.name 
  from business_user 
  join businesses 
    on business_user.business_id = businesses.id
 where business_user.user_id     = Auth::user()->id() ;

I would like to query the pivot table with Eloquent, but I can't get the syntax right. Do I need a model for that business_user table?

Do some of you prefer not using Eloquent at all?

Thanks cv

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