Laravel 在一个 Pivot 上进行一对多插入 table

Question

我正在使用 Laravel 5.3 广告，在通过 hasMany 关系进行保存时遇到问题。

我有表 employee 和 activity 具有一对多关系，即每个员工将执行许多活动。

当我使用 associate() 添加针对员工的活动时，它向我发送了一个错误：

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

下面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

模特Class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');
    }
}

型号ClassActivity:

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';
    }
}

我这里的关系定义有误吗？

Answer 1

您的关系定义不正确。通过查看您的 table 结构，它应该是 many-to-many 关系。

模特Class员工：

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

型号ClassActivity:

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 table 架构更改为：

删除table employee_activity table并在activity中添加列employee_id table然后根据one-to-many定义关系.

Answer 2

使用多对多方案，在迁移时，将字段 'activity_id' 定义为 'unique' on table 'employee_activity':

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

这样，您可以在'employee_activity' table 上注册一个activity 只关联一个员工，一个员工可以关联多个活动。否则，将产生一个独特的错误。

Laravel 在一个 Pivot 上进行一对多插入 table

Laravel One-To-Many insertion on a Pivot table

php

one-to-many

laravel

eloquent

laravel-5.3