Laravel SQLSTATE [23000]：完整性约束违规：1452无法添加或更新子行

Question

我试图做一个基本的简单CRUD使用laravel框架，我设法做出一个简单的CRUD没有选择形式，但是当我使用select形式，它越来越错误消息

完整的错误

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（activity_report_2015-04-22tn_project， CONSTRAINT fk_client_id FOREIGN KEY（cv_client_id）参考文献tn_client（cn_id））（SQL：插入tn_project（cv_created_by，​​，cv_id，cv_name，cv_client_id，cn_invoice_method，cn_project_rate，cn_note）值（ADA，2016年2月18日二十三时52分45秒，TestProject，测试名，$客户端 - > cn_id，$ invoice-> cn_id，1.2，JustTest））

cv_client_id和cv_invoice_method的来自不同的表，该表是tn_client和tn_invoice_method的价值，我注意到为什么值得cv_client_id和cv_invoice_method结果查询比值比任何想法？

如果能跟大家需要更多的信息，只是让我知道

查看

<div class="form-group"> 
    <label class="col-md-3 control-label">Client</label> 
    <div class="col-md-9"> 
     <select name="clientId" id="clientId" class="form-control" placeholder="Select Client"> 
      @foreach ($clients as $client) 
       <option value='$client->cn_id'>{{$client->cv_name}}</option>; 
      @endforeach  
     </select> 
    </div> 
</div> 
<div class="form-group"> 
    <label class="col-md-3 control-label">Invoice Method</label> 
    <div class="col-md-9"> 
     <select type="hidden" name="invoiceId" id="invoiceId" class="form-control"> 
      @foreach ($invoices as $invoice) 
       <option value='$invoice->cn_id'>{{$invoice->cv_method}}</option>; 
      @endforeach 
     </select> 
    </div> 
</div> 

控制器

public function createOrEdit(){ 
    $currentUsername = Auth::user()->name; 

    $isUpdate = false; 
    $projectId = Input::get('prevId'); 

    //populate data 
    $project = new Project; 
    if($projectId != ""){ 
     $project = Project::where('cv_id','=',$projectId)->firstOrFail(); 
     $project->cv_updated_by = $currentUsername; 
     $project->cn_updated_at = Carbon::now(); 
     $isUpdate = true; 
    } else{ 
     $project->cv_created_by = $currentUsername; 
     $project->cn_created_at = Carbon::now(); 
    } 

    $project->cv_id = Input::get('projectId'); 
    $project->cv_name = Input::get('projectName'); 
    $project->cv_client_id = Input::get('clientId'); 
    $project->cn_invoice_method = Input::get('invoiceId'); 
    $project->cn_project_rate = Input::get('projectRate'); 
    $project->cn_note = Input::get('note'); 

    //execute 
    if($isUpdate){ 
     Log::info("entering update mode"); 
     Project::where('cv_id','=',$projectId)->update(['cv_id'=>$project->cv_id, 
        'cv_name'=>$project->cv_name, 
        'cv_client_id'=>$project->cv_client_id, 
        'cn_invoice_method'=>$project->cn_invoice_method, 
        'cn_project_rate'=>$project->cn_project_rate, 
        'cn_note'=>$project->cn_note, 
        'cn_updated_at'=>$project->cn_updated_at, 
        'cv_updated_by'=>$project->cv_updated_by]); 
    }else{ 
     $project->save(); 
    } 

    return Response::json(
      array(
        'content' => Project::with('client','invoice')->get(), 
        'status' => 'success', 
       ) 
     ); 
} 

注意：如果在我的控制，我把cv_client_id和cv_invoice_method手动的价值，它的做工精细

Answer 1

你忘了回声$客户 - > cn_id <option value='{{$client->cn_id}}'>{{$client->cv_name}}</option>;

同样在这里： <option value='{{$invoice->cn_id}}'>{{$invoice->cv_method}}</option>;