用户角色之间的雄辩关系

Question

I am creating an app where users have different roles. Some of the roles include:

• Administrator
• Supervisor
• Contractor

I have the following tables setup:

• user
• role
• role_user

The role_user is a pivot table used to store the user_id and role_id .

Now, when a Contractor is created, I trigger an event which assigns the user to the Contractor role in the database:

$user->roles()->save($role, ['cust_id' => $event->user->cust_id]);

The above line basically just creates a new row in the role_user pivot table and points to the role_id of a Contractor . This results in the user having Contractor privileges.

Also, within the event I need to assign the user to a Supervisor . However, there is no Supervisor model. Supervisors are also stored in the user table and have a role of Supervisor assigned to them.

How can I create a relationship between Contractors and Supervisors ?

Ideally, i'd like to use something like this to create the Contractor/Supervisor relationship in the pivot table:

$user->supervisors()->save($supervisors, ['cust_id' => $event->user->cust_id]);

But i'm not sure how to setup my model...?

/**
 * The supervisors that belong to the user.
 *
 * @return Object
 */
public function supervisors()
{
    return $this->belongsToMany('SimplyTimesheets\Models\User\User')->withTimestamps();
}

Answer 1

What your asking is possible, however your relationship model would look like this:

public function cands()
{
    return $this->belongsToMany('Some\Model')->where('something', $something)->where('something', $something); 
}

You would have to use where clauses to hard code a relationship between contractors and supervisors because there is no direct relationship between them both.

/ * Edit * /

From your comment, you would have to approach that query with eager loading your relationship like so:

User::has('supervisors')->join(...)->where(...)->get();

The query above would return all users which meet the roles criteria. If you was just after one result you could create a hasOne relationship with your where clauses.

public function relationship()
{
    return $this->hasOne('Your\User_Role\Model', 'foreign_key', 'other_key')->where('role_id', supervisor)->where('role_id', contractor)
}

It all comes down to your application needs.