Question

大家好，我需要你的帮助。我是laravel 5.4的初学者。我试图添加一个外键字段，但它没有添加并产生错误没有默认值。

UsersController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');

    });

}

用户

中的create.blade.php

<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

branch_id对模型不可见，因为它不在可填充数组中。

在App \ User.php中

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

Answer 2

您需要将index()和nullable()添加到您已声明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： - 在表单中更改此内容。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>

如果尚未解决，请检查branch_id模型中的fillable是否添加了User。如果没有添加，请添加。

Answer 3

您应该在用户模型上添加branch_id，如下所示：

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

我希望这可以帮到你

Answer 4

  const someArray = someJsonObj.map( obj => Object.values(obj) );

在这段代码中你有两次在db中请求。而不是这个使用

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 (*)
}

将打印

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());

在视图中修复它

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

@foreach ($branches as $branchId => $branchName) <option value= "{{ $branchId}}"> {{ $branchName }} </option> @endforeach属性中的User模型添加fillable

SQLSTATE [HY000]：常规错误：1364字段'branch_id'没有默认值laravel 5.4

4 个答案: