SQLSTATE[23000]：违反完整性约束 1452 无法添加或更新子行：外键约束失败

Question

我有这个迁移文件

class AddRolesFieldsToUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('users', function (Blueprint $table) {
            $table->foreignId('role_id')->constrained();
            $table->string('student_address')->nullable();
            $table->string('student_licence_number')->nullable();
            $table->string('teacher_qualifications')->nullable();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('users', function (Blueprint $table) {
            //

并且用户模型具有如下所示的所有可填充项

class User extends Authenticatable
{
    use HasApiTokens;
    use HasFactory;
    use HasProfilePhoto;
    use Notifiable;
    use TwoFactorAuthenticatable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name',
        'email',
        'password',
        'role_id',
        'student_address',
        'student_licence_number',
        'teacher_qualifications',
    ];

但是我得到了 SQLSTATE[23000]: Integrity constraint violation 1452 Cannot add or update a child row: a foreign key constraint fails when I try to register a new user，我应该如何解决这个问题？

Answer 1

要解决此问题，请手动将角色值插入数据库。

所以对于第一行：

id=2 | name=Teacher | created_at =0000-00-00 00:00:00|updated_at 0000-00-00 00:00:00

第二行：

id=3 | name=Student| created_at =0000-00-00 00:00:00|updated_at 0000-00-00 00:00:00

SQLSTATE[23000]：违反完整性约束 1452 无法添加或更新子行：外键约束失败

SQLSTATE[23000]: Integrity constraint violation 1452 Cannot add or update a child row: a foreign key constraint fails

laravel-8

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