Question

我正在使用 Laravel 5.3 广告，因为hasMany关系存档问题。

我有表员工和活动，其中包含一对多关系，即每个员工都会执行许多活动。

当我使用associate()向员工添加活动时，它会向我发送错误消息：

BadMethodCallException in Builder.php line 2440:
Call to undefined method Illuminate\Database\Query\Builder::associate()

以下是数据库结构和代码：

数据库结构：

employee (1st table)
– employee_id
– employee_name
- created_at
- updated_at

activity (2nd table)
– activity_id
– activity_name
- created_at
- updated_at

employee_activity (pivot table)
– employee_activity_employee_id
– employee_activity_activity_id

模型类员工：

class Employee extends Model
{
    protected $table = 'employee';
    protected $primaryKey = 'employee_id';

    public function activity() {
        return $this->hasMany('App\Models\Activity', 'employee_activity', 'employee_activity_employee_id', 'employee_id');
    }
}

模特课程活动：

class Activity extends Model
{
    protected $table = 'activity';
    protected $primaryKey = 'activity_id';

    public function employee() {
        return $this->belongsTo('App\Models\Employee', 'employee_activity', 'employee_activity_activity_id' ,'activity_id');
    }
}

控制器：

public function EmployeeActivityAssociation()
{
    $employee_id = Input::get('employee_id');
    $activity_ids = Input::get('activity_id'); // This is an array of activities
    $employee = Employee::find($employee_id);
    if (!empty($employee)) {
         //Adding activity under the employee
        foreach ($activity_ids as $id) {
            $activity = Activity::find($id);
            $employee->activity()->associate($activity);
            $employee->save();
        }
        return 'Activities asscoiated to employee';
    }   
    else {
        return 'Employee not found';
    }
}

我的关系定义不正确吗？

Answer 1

您的关系未正确定义。通过查看表结构，它应该是many-to-many关系。

Model Class Employee：

public function activity() {
    return $this->belongsToMany('App\Models\Activity', 'employee_activity', 'employee_activity_employee_id', 'employee_id');
}

模特课程活动：

public function employee() {
    return $this->belongsToMany('App\Models\Employee', 'employee_activity', 'employee_activity_activity_id' ,'activity_id');
}

所以你的控制器应该是：

public function EmployeeActivityAssociation()
{
    $employee_id = Input::get('employee_id');
    $activity_ids = Input::get('activity_id'); // This is an array of activities
    $employee = Employee::find($employee_id);
    if (!empty($employee)) {
        $employee->activity()->attach($activity_ids);
      return 'Activities asscoiated to employee';
    }   
    else {
        return 'Employee not found';
    }
}

如果您想坚持一对多关系，那么您必须将表格模式更改为：

删除表employee_activity表并在活动表中添加列employee_id，然后根据one-to-many定义关系。

Answer 2

使用多对多方案，并在迁移时，将表 'employee_activity' 上的字段 'activity_id' 定义为 'unique'：

$table->unsignedInteger('employe_id');    
$table->unsignedInteger('activity_id')->unique();

通过这种方式，您可以在“employee_activity”表上只注册一个与一名员工相关联的活动，而一名员工可以与许多活动相关联。否则，将产生一个独特的错误。

在数据透视表上插入Laravel One-To-Many

2 个答案: