database - laravel 5.4 多对多关系

Question

我与 pjt_role_admin 具有多对多表“admins”、“pjt_roles”的关系。 但是，不工作

我有 2 个模型

类角色

protected $table = 'pjt_roles';

public function Admin(){
    return $this->belongsToMany(Admin::class',pjt_role_admin');
}

类(class)管理员

public function Role(){
    return $this->belongsToMany(Role::class,'pjt_role_admin');
}

和表pjt_role_admin有属性

1. admin_id 来自表 admins

2. 来自表pjt_roles的role_id

Answer 1

指定关系中的数据透视表。默认 laravel 假设 admin_role 作为您的数据透视表，因为您有 Admin 和 Role 模型

class Role

protected $table = 'pjt_roles';

public function Admin(){ // should be admins() for better readability
    return $this->belongsToMany(Admin::class, 'pjt_role_admin');
}

class Admin

public function Role(){ // should be roles() for better readability
    return $this->belongsToMany(Role::class, 'pjt_role_admin');
}

To determine the table name of the relationship's joining table, Eloquent will join the two related model names in alphabetical order. However, you are free to override this convention. You may do so by passing a second argument to the belongsToMany method.

获取数据

$admin = Admin::find(1);
$roles = $admin->Role; // should change to roles() in relationship for better readability

保存

$admin->Role()->attach($roleId);

详情https://laravel.com/docs/5.4/eloquent-relationships#many-to-many