SQLSTATE [23000]：Laravel中违反完整性约束

Question

当我单击提交（保存）按钮以创建作业时...然后出现以下异常...。（ user_name字段已在job.create.blade视图表单中隐藏为已放置 ）

您能告诉我在哪里可以修改以进行修复？ 谢谢。

（3/3）QueryException

SQLSTATE [23000]：完整性约束违规：1452不能添加或更新子行，外键约束失败（ admin-db 。 jobs ，约束jobs_customer_name_foreign外键（ customer_name ）参考文献customers （ customer_name ））（SQL：插入到jobs （ user_name ， customer_name ， job_place ， job_type ， note_1 ， time_used ， updated_at ， created_at ）值（约翰，1，KONTOR，多梅内OG Webhotell，ASDF，2017年10月8日0时23分40秒，2017年10月8日0时23分：40））

timestamp_create_users_table.php

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->engine = 'InnoDB';            
        $table->increments('id')->unsigned();

        $table->string('name')->index();
        $table->string('email');
        $table->string('password');
        $table->rememberToken();
        $table->timestamps();
    });
}

timestamp_create_customers_table.php

public function up()
{        
    Schema::create('customers', function (Blueprint $table) {
        $table->engine = 'InnoDB';
        $table->integer('id')->unsigned();

        $table->string('customer_name')->index();
        $table->string('customer_email');
        $table->timestamps();
        $table->softDeletes();
    });
}

timestamp_create_jobs_table.php

public function up()
{

    Schema::create('jobs', function (Blueprint $table) {
        $table->engine = 'InnoDB';

        $table->increments('id')->unsigned();

        $table->string('user_name')->index();
        $table->string('customer_name')->index();        
        $table->string('job_place');
        $table->string('job_type');
        $table->string('note_1');
        $table->time('time_used')->nullable();
        $table->timestamps();
        $table->softDeletes();

        $table->foreign('user_name')->nullable()->references('name')->on('users')->onDelete('cascade');
        $table->foreign('customer_name')->nullable()->references('customer_name')->on('customers')->onDelete('cascade');
    });
}

模型关系定义在：Job.php

public function users()
{
    return $this->belongsTo(User::class);
}

public function customers()
{
    return $this->belongsTo(Customer::class);
}

模型关系定义在：Customer.php

public function jobs()
{
    return $this->hasMany(Job::class);
}

Answer 1

我一个人得到答案...

问题是采摘方法 。 修改后，下面的工作正常。

<div class="form-group col-sm-6">
        {!! Form::label('customer_name', 'Customer Name:') !!}
        {!! Form::select('customer_name', $searchdata->pluck('customer_name', 'customer_name')->all(), null, ['class' => 'form-control']) !!}
</div>