我正在开发协作者，为项目管理应用程序添加方法。这是我的合作者添加表格。
colllaborators/form.blade.php
<div class="col-md-4" style="border:1px solid #ccc;margin-left:15px;padding:10px;">
<h4 class="page-header">
Collaborators
</h4>
@if( $collaborators)
@foreach( $collaborators as $collaborator)
<div>
<div>
<span>
<img src="{{ $collaborator->user()->first()->getAvatarUrl() }}" />
</span>
</div>
<button class="btn btn-sm btn-danger delete" style="margin-top:5px;padding:4px;width:35px;"
data-action="/projects/{{ $project->id }}/collaborators/{{ $collaborator->collaborator_id }}"
路由
Route::post('projects/{projects}/collaborators', [
'uses' => 'Project\Collaborators\Controller@addCollaborator',
'as' => 'projects.collaborators.create',
'middleware' => ['auth']
]);
但是当我点击协作者添加按钮后显示错误消息。
Undefined variable: collaborators (View: C:\Users\Flex\Desktop\ddd\resources\views\collaborators\form.blade.php)
我该如何解决这个问题 的编辑
class ProjectCollaboratorsController extends Controller
{
public function addCollaborator(Request $request, $id, Collaboration $collaboration)
{
$this->validate($request, [
'collaborator' => 'required|min:5',
]);
$collaborator_username = substr(trim($request->input('collaborator')),1);
$collaboration->project_id = $id;
if( is_null($this->getId($collaborator_username)))
{
return redirect()->back()->with('warning', 'This user does not exist');
}
$collaborator = $this->isCollaborator($id, $this->getId($collaborator_username));
if(! is_null($collaboration))
{
return redirect()->back()->with('warning', 'This user is already a collaborator on this project');
}
$collaboration->collaborator_id = $this->getId($collaborator_username);
$collaboration->save();
return redirect()->back()->with('info', "{$collaborator_username} has been added to your project successfully");
}
private function getId($username)
{
$result = User::where('username', $username)->first();
return (is_null($result)) ? null : $result->id;
}
private function isCollaborator($projectId, $collaboratorId)
{
return Collaboration::where('project_id', $projectId)
->where('collaborator_id', $collaboratorId)
->first();
}
}
请参阅表单的其他部分
<form class="form-vertical" role="form" method="post" action="{{ route('projects.collaborators.create', $project->id) }}">
协作者表格路线
Route::get('/collaborators', function(){
return view('collaborators.form');
})->name('collaborators.form');
答案 0 :(得分：1)
在您的表单页面中，您正在检查@if( $collaborators)，检查$collaborators变量是否为空，然后运行其下方的foreach。
提交表单后，您添加了协作者并重定向，但没有collaborators。 if条件然后尝试检查变量是否为空。此时变量尚未定义，因此会抛出该错误。要修复此错误，请使用collaborators返回重定向，如下所示：
public function addCollaborator(Request $request, $id, Collaboration $collaboration)
{
$this->validate($request, [
'collaborator' => 'required|min:5',
]);
$collaborator_username = substr(trim($request->input('collaborator')),1);
$collaboration->project_id = $id;
if( is_null($this->getId($collaborator_username)))
{
return redirect()->back()->with('warning', 'This user does not exist');
}
$collaborator = $this->isCollaborator($id, $this->getId($collaborator_username));
if(! is_null($collaboration))
{
return redirect()->back()->with('warning', 'This user is already a collaborator on this project');
}
$collaboration->collaborator_id = $this->getId($collaborator_username);
$collaboration->save();
//Get all collaborators
$collaborators = Collaboration::all(); //if this is how you get all collaborators
//Get the project too
$project = Project::findOrFail($id);
return redirect()->back()->with(['collaborators'=>$collaborators,'project'=>$project,'info'=> "{$collaborator_username} has been added to your project successfully"]);
}
修改
使用with方法将数据放入会话中，我建议您手动重定向到视图并将message闪存到该视图。
public function addCollaborator(Request $request, $id, Collaboration $collaboration)
{
$this->validate($request, [
'collaborator' => 'required|min:5',
]);
$collaborator_username = substr(trim($request->input('collaborator')),1);
$collaboration->project_id = $id;
if( is_null($this->getId($collaborator_username)))
{
return redirect()->back()->with('warning', 'This user does not exist');
}
$collaborator = $this->isCollaborator($id, $this->getId($collaborator_username));
if(! is_null($collaboration))
{
return redirect()->back()->with('warning', 'This user is already a collaborator on this project');
}
$collaboration->collaborator_id = $this->getId($collaborator_username);
$collaboration->save();
//Get all collaborators
$collaborators = Collaboration::all(); //if this is how you get all collaborators
//Get the project too
$project = Project::findOrFail($id);
return redirect()->route('collaborators.form',['collaborators'=>$collaborators,'project'=>$project])->with('info',"{$collaborator_username} has been added to your project successfully");
}
修改2
我更改了所有return redirect()->back()＆＃39>
public function addCollaborator(Request $request, $id, Collaboration $collaboration)
{
$this->validate($request, [
'collaborator' => 'required|min:5',
]);
$collaborator_username = substr(trim($request->input('collaborator')),1);
$collaboration->project_id = $id;
//Get the project too
$project = Project::findOrFail($id);
if( is_null($this->getId($collaborator_username)))
{
return redirect()->route('collaborators.form',['project'=>$project])->with('warning', 'This user does not exist');
}
$collaborator = $this->isCollaborator($id, $this->getId($collaborator_username));
if(! is_null($collaboration))
{
return redirect()->route('collaborators.form',['project'=>$project])->with('warning', 'This user is already a collaborator on this project');
}
$collaboration->collaborator_id = $this->getId($collaborator_username);
$collaboration->save();
return redirect()->route('collaborators.form',['project'=>$project])->with('info',"{$collaborator_username} has been added to your project successfully");
}
将您的routes更改为
Route::get('/project/{project}/collaborators', function($id){
$collaborators = Collaboration::all();
$project = Project::findOrFail($id);
return view('collaborators.form',compact('collaborators','project'));
})->name('collaborators.form');