Laravel HasManyThrough Keys

问题

I have 3 models: User, Program, UserProgram. UserProgram is an actual model of its own.

Here are how the models look in the database:

• users
  • id
• programs
  • id
• user_programs
  • user_id
  • program_id

I would like to have in my Program model:

function users() {
    return $this->hasManyThrough('App\User','App\UserProgram');
}

But this does not work. How can I make this relationship work?

回答1:

hasManyThrough is not used for this purpose. You need a many-to-many relationship.

class Users {
  public function programs() {
    return $this->belongsToMany('App\Program', 'user_programs', 'user_id', 'program_id');
  }
}

and

class Program {
  public function users() {
    return return $this->belongsToMany('App\User', 'user_programs', 'program_id', 'user_id');
  }
}

来源：https://stackoverflow.com/questions/38287685/laravel-hasmanythrough-keys