SQLSTATE[HY000]: General error: 1364 Field 'branch_id' doesn't have a default value laravel 5.4

Question

大家好，我需要你们的帮助。我是 laravel 5.4 的初学者。我正在尝试添加一个外键字段，但它没有添加并产生错误没有默认值。

Add view

Then the error

用户控制器代码：

    public function create()
{
    $branches = Branch::pluck('name', 'id');
    return view('users.create', ['branches' => Branch::all()]);
}


public function store(Request $request)
{
    $this->validate($request, [
        'branch_id' => 'required',
        'fname' => 'required',       
        'lname' => 'required',
        'contact_number' => 'required',
        'bday' => 'required',
        'position' => 'required',
        'status' => 'required',
        'username' => 'required',
        'password' => 'required'
    ]);

    User::create($request->all());

    session()->flash('success_msg', 'Employee has been added!');
    return redirect('/employees');
}

用户模型：

public function branch()
{
  return $this->belongsTo(Branch::class);
}

用户迁移：

public function up()
{
    Schema::dropIfExists('users');
    Schema::disableForeignKeyConstraints();
    Schema::create('users', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('branch_id')->unsigned();
        $table->string('fname');
        $table->string('lname');
        $table->string('contact_number');
        $table->date('bday');
        $table->integer('position');
        $table->integer('status');
        $table->string('username');
        $table->string('password');
        $table->rememberToken();
        $table->timestamps();

        $table->foreign('branch_id')->references('id')->on('branches')->onDelete('cascade');

    });

}

create.blade.php 用户

<div class="form-group">
    <label for="branch_id">Branch: </label>
    <!--{{ Form::select('branch_id', $branches, null) }}-->
    <select class="form-control" name="branch_id">
        @foreach ($branches as $branch)
            <option value= "{{ $branch->id}}">
              {{ $branch->name }}
            </option>
        @endforeach
    </select>
  </div>

Answer 1

您需要将 index() 和 nullable() 添加到您声明 branch_id 的迁移文件中，如下所示：-

public function up()
{
Schema::dropIfExists('users');
Schema::disableForeignKeyConstraints();
Schema::create('users', function (Blueprint $table) {
    $table->increments('id');
    $table->integer('branch_id')->unsigned()->index()->nullable();
    $table->string('fname');
    $table->string('lname');
    $table->string('contact_number');
    $table->date('bday');
    $table->integer('position');
    $table->integer('status');
    $table->string('username');
    $table->string('password');
    $table->rememberToken();
    $table->timestamps();

    $table->foreign('branch_id')->references('id')->on('branches')->onDelete('cascade');

});

}

编辑：- 在您的表单中更改此项。您需要在 foreach 之前声明选项值，如下所示：-

<div class="form-group">
<label for="branch_id">Branch: </label>
<!--{{ Form::select('branch_id', $branches, null) }}-->
<select class="form-control" name="branch_id">
<option value="" disabled selected>{{ trans('select_branch') }}</option>   
    @foreach ($branches as $branch)
        <option value= "{{ $branch->id}}">
          {{ $branch->name }}
        </option>
    @endforeach
</select>

如果还没有解决，请检查 branch_id 是否添加到 fillable in User 模型中。没加就加

Answer 2

您应该像这样在用户模型上添加 branch_id 作为可填充的 :

 protected $fillable = [
    'username', 'email', 'password', 'branch_id'
];

希望对你有所帮助

Answer 3

branch_id 对模型不可见，因为它不在可填充数组中。

在App\User.php

protected $fillable = [ ... ]; // add branch_id
// or
protected $guarded = [];

Answer 4

public function create()
{
    $branches = Branch::pluck('name', 'id');  // first time request
    return view('users.create', ['branches' => Branch::all()]); 
    // Branch::all() second time request and select all (*)
}

在此代码中，您 2 次在数据库中进行请求。而不是这个使用

public function create()
{
    $branches = Branch::pluck('name', 'id');
    return view('users.create', compact('branches'));
    // or return view('users.create', ['branches' => ]);
}


 $branches = Branch::pluck('name', 'id');
 dd($branches->all());

将打印

array:100 [▼
  1 => "branch1"
  2 => "branch2"
  3 => "branch3"
  4 => "branch4"
  .
  .  
  .
]

在视图中修复它

@foreach ($branches as $branchId => $branchName)
   <option value= "{{ $branchId}}">
      {{ $branchName }}
   </option>
@endforeach

和User模型在fillable属性添加branch_id

SQLSTATE[HY000]: General error: 1364 Field 'branch_id' doesn't have a default value laravel 5.4

SQLSTATE[HY000]: General error: 1364 Field 'branch_id' doesn't have a default value laravel 5.4

php

laravel

laravel-5.4