SQLSTATE [HY000]：常规错误：1364字段'requisition_id'没有默认值

Question

以下是我的关系。

SubmitApplication.php

public function requisition()
{
    return $this->hasMany(Requisition::class);
}

Requisition.php

public function submitApplication()
{
    return $this->belongsTo(SubmitApplication::class);
}

我的刀片

<form class="btn-group" action="{{ route('requisitions.update', ['id' => $requisition->id]) }}" method="post">
    {{ method_field('PATCH') }}
    {{ csrf_field() }}
    <button type="submit" class="btn btn-success btn-xs">تایید</button>
</form>

RequisitionController.php

public function update(Request $request, SubmitApplication $submitApplication)
{
    $submitApplication->approved = 1;
    $submitApplication->save();
    return redirect()->back();
}

对于请购单表：

public function up()
{
    Schema::create('requisitions', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('school_id')->unsigned();
        $table->string('type');
        $table->string('status');
        $table->string('date');
        $table->timestamps();

        $table->foreign('school_id')->references('id')->on('schools');
    });
}

对于submit_applications表：

public function up()
{
    Schema::create('submit_applications', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('requisition_id')->unsigned();
        $table->integer('school_id')->unsigned();
        $table->integer('approved');
        $table->string('application');
        $table->timestamps();
        $table->foreign('requisition_id')->references('id')->on('requisitions');
        $table->foreign('school_id')->references('id')->on('schools');
    });
}

RequisitionController.php

public function update(Request $request, SubmitApplication $submitApplication)
{
    $submitApplication->approved = 1;
    $submitApplication->save();
    return redirect()->back();
}

我收到此错误。

  

SQLSTATE [HY000]：常规错误：1364字段'requisition_id'没有   有一个默认值（SQL：插入submit_applications   （approved，updated_at，created_at）值（1，2018-06-18   04：22：48,2018-06-18 04:22:48））

当我点击已批准的按钮时。它补充道。 id不想添加

也许我做错了？

Answer 1

在 submit_applications 表格中，将nullable设置为 requisition_id

public function up()
{
    Schema::create('submit_applications', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('requisition_id')->nullable()->unsigned();
        $table->integer('school_id')->nullable()->unsigned();
        $table->integer('approved')->nullable(true);
        $table->string('application')->nullable(true);
        $table->timestamps();
        $table->foreign('requisition_id')->references('id')->on('requisitions');
        $table->foreign('school_id')->references('id')->on('schools');
    });
}