Laravel 5与`wherePivot`雄辩的查询`belongsToMany`无法正常工作

Question

Suppose I have users,courses and course_users tables, users belongs to many courses and the structure of pivot table course_users is as bellow:

| user_id | course_id | relation_type |
|-----------------------------------------------|

now I have bellow code:

$user = User:find(1);

and I have bellow function in user model:

public function courses(){
    return $this->belongsToMany('App\Models\Course')->wherePivot('relation_type', 1)->orWherePivot('relation_type', 0)->withPivot('relation_type', 'created_at', 'updated_at');
}

and if I want to get the course of user:

$user->courses();

But the output query of above function is like:

select 
  `courses`.*, `course_user`.`user_id` as `pivot_user_id`,`course_user`.`course_id` as `pivot_course_id`, 
  `course_user`.`relation_type` as `pivot_relation_type`,`course_user`.`created_at` as `pivot_created_at`, `course_user`.`updated_at` as `pivot_updated_at` 
from 
  `courses` inner join `course_user` on `courses`.`id` = `course_user`.`course_id` 
where 
  `course_user`.`user_id` = '1' and `course_user`.`relation_type` = '0' or `course_user`.`relation_type` = '1';

But I need to have something like this:

select 
   `courses`.*, `course_user`.`user_id` as `pivot_user_id`, `course_user`.`course_id` as `pivot_course_id`, 
   `course_user`.`relation_type` as `pivot_relation_type`, `course_user`.`created_at` as `pivot_created_at`, `course_user`.`updated_at` as `pivot_updated_at` 
from 
   `courses` inner join `course_user` on `courses`.`id` = `course_user`.`course_id` 
where 
   `course_user`.`user_id` = '1' and (`course_user`.`relation_type` = '0' or `course_user`.`relation_type` = '1');

The difference is in where clause.

Answer 1

The wherePivot method on the relationship is just a shortcut for the where method, but it takes care of adding on the pivot table qualifier for the constraints. Because of this, it doesn't support closures, which is what you need to use in order to group your constraints. Therefore, you will need to call the where method directly, and manually add in the table name qualifier to your where conditions.

Something like:

public function courses() {
    return $this->belongsToMany('App\Models\Course')
        // pass a closure to group your constraints
        ->where(function ($query) {
            return $query->where('course_user.relation_type', 1)
                ->orWhere('course_user.relation_type', 0);
        })
        ->withPivot('relation_type', 'created_at', 'updated_at');
}