[英]How to delete a foreign key constraint in Laravel?
我正在做一个项目,在这个项目中,我在两个表User & Registration中以这样的形式添加数据
public function storeStudent(Request $request)
{
$created_user = User::create([
'name' => $request->name,
'email' => $request->email,
'password' => bcrypt($request->password),
'parent_id' => $request->parent_id,
'role_id' => $request->role_id,
'gender'=> $request->gender,
'date_of_birth'=> $request->date_of_birth,
'cnic'=>$request->cnic,
'religion'=>$request->religion,
'skills'=>$request->skills,
'physical'=>$request->physical,
'emergency_name'=>$request->emergency_name,
'phone_no'=>$request->phone_no,
'medical_info'=>$request->medical_info,
'family_dr'=>$request->family_dr,
'address'=>$request->address,
]);
Registration::create([
//reg_id is id for registration table
'user_id' => $created_user->id,
'class_id' => $request->class_id,
'section_id' => $request->section_id,
]);
现在我想删除语法不好的数据。 我不知道我该怎么做才能删除我正在尝试的数据
public function destroy(Request $request)
{
$user = User::findOrFail($request->user_id);
$user->delete();
$registration=Registration::findOrFail($request->user_id);
$registration->delete();
return back();
}
登记表是
Schema::create('registrations', function (Blueprint $table) {
$table->increments('reg_id');
$table->integer('user_id')->unsigned();
$table->foreign('user_id')->references('id')->on('users');
$table->integer('class_id')->unsigned();
$table->foreign('class_id')->references('id')->on('classses');
$table->integer('section_id')->unsigned();
$table->foreign('section_id')->references('id')->on('sections');
$table->timestamps();
});
但它给了我错误
Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`jurs1`.`registrations`, CONSTRAINT `registrations_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`)) (SQL: delete from `users` where `id` = 10)
在这种情况下,请帮助我。
$table->integer('user_id')->unsigned();
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
使用 ->onDelete('cascade') 对我有用:)
您无法从用户表中删除记录,因为您与注册表 ( registrations_user_id_foreign
) 有关系。 为了删除用户记录,您首先必须从注册表中删除该用户的所有记录。 你有两种方法:
修改注册表的关系
$table->foreign('user_id')->references ('id')->on('users')->onDelete ('cascade');
有了这个,当你做一个
$user->delete()
该用户的记录也将从注册表中删除。
或者第二种方式:
删除注册记录后删除用户
$user->registrations()->delete();
$user->delete();
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.