Laravel同步（）方法错误

什么，我有简短的解释：使用数据透视表project和user之间的关系ManyOnMany叫project_user。Laravel同步（）方法错误

当显示某个项目的用户印有复选框的列表，以便他们将尽快复选框被选中链接到项目（所以它会发送user_id + project_id到pivot table

enter image description here

现在的问题。当我们让用户（例如Admin der Liam）链接到项目，将工作和数据将被发送到数据库中。但当复选框再次选中它会给一个Call to a member function users() on a non-object错误而不是清理表格并仅放入已选中的框到数据库

控制器：

public function edit($id, Project $project) 
{ 
    $users = User::with('projects')->get(); 

    $project = $this->project->find($id); 

    return view('project.edit', ['project' => $project, 'id' => 'edit', 'project_id' => $id, 'users' => $users]); 
} 


public function update(CreateProjectRequest $request) 
{ 
    if($request->get('contribute')) 
    { 
     foreach($request->get('contribute') as $k => $contribute) 
     { 
      if($contribute == 1) 
      { 
       $project = $this->project->find($request->project_id); 
       $keys[] = $k; 
      } 
     } 
    } 
    $project->users()->sync($keys); 

    $project = $this->project->find($request->project_id); 
    $project->fill($request->input())->save(); 

    return redirect('project'); 
}

HTML /刀片：

@if(isset($users)) 
@foreach($users as $user) 
    <tr> 
     <td> 
      {{$user->firstname}} {{$user->middlename}} {{$user->lastname}} 
     </td> 
     <td> 
      {!! Form::checkbox('contribute['.$user->id.']', '1', $user->projects->contains($project->id)) !!} 
     </td> 
    </tr> 
@endforeach 
@endif

来源

2015-05-21 Liam

你把这个$项目 - >用户（） - >同步（$键）;在下一行中启动$ project对象之前。这就是为什么users（）不是成员函数的原因。 –

那么需要改变以使其按预期工作？ – Liam

把$ project-> users（） - > sync（$ keys）;在$ project = $ this-> project-> find（$ request-> project_id）之后;在你的while循环中。 –

public function update(CreateProjectRequest $request) 
{ 
    $this->project = $this->project->find($request->project_id); 
    if($request->get('contribute')) 
    { 
     foreach($request->get('contribute') as $k => $contribute) 
     { 
      if($contribute == 1) 
      { 
       $keys[] = $k; 
      } 
     } 
    } 

    if(isset($keys)) { 
     $this->project->users()->sync($keys); 
    } 
    else { 
     $this->project->users()->detach(); 
    } 

    $this->project = $this->project->find($request->project_id); 
    $this->project->fill($request->input())->save(); 

    return redirect('project'); 
}

来源

2015-05-21 14:53:51 Liam

你$项目是空的，因为你宣布在foreach $项目。尝试在foreach之外声明它。

来源

2015-05-21 14:36:40

将$project->users()->sync($keys);放在$project = $this->project->find($request->project_id);之后的while循环中。您应该在初始化对象后同步$ project。

foreach($request->get('contribute') as $k => $contribute) 
{ 
    if($contribute == 1) 
    { 
     $project = $this->project->find($request->project_id); 
     $keys[] = $k; 
     $project->users()->sync($keys); 
    } 
}

来源

2015-05-21 14:47:28

Laravel同步（）方法错误

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