无法在中间表格中存储值

Question

我有一个想法和社区模型。他们之间存在着多对多的关系。关系正在形成完美。但是，我面临一个问题。 可以在社区中找到一个想法，社区可以有很多想法。因此，基于此，有一个中间表。我无法将community_id和idea_id存储在数据透视表中。

public function storePost(IdeaRequest $request)
{
  if ($request->hasFile('idea_image')) {
      $filename = $request->file('idea_image')->getClientOriginalName();
      $moveImage = $request->file('idea_image')->move('images/', $filename);
  }
      $idea = new Idea();
      $idea->idea_title = $request->input('idea_title');
      $idea->user_id = Auth::id();
      $idea->idea_image = $moveImage;
      $idea->idea_info = $request->input('idea_info');
      $idea->communities()->attach($request->input('selection'));
      $idea->idea_location = $request->input('idea_location');
      $idea->idea_goal = $request->input('idea_goal');
      $idea->idea_description = strip_tags($request->input('idea_description'));
      $idea->save();
      Session::set('idea_id',$idea->id);
      session()->flash('flash_message', 'Your idea has been submitted for Review, Kindly Fill this Work BreakDown of You Work');
      return redirect()->route('create_wbs');
}

此行存在问题

  

$ idea-＆GT;社区（） - ＆GT;附加（$请求 - ＆GT;输入（ '选择'））;

修改

<form id="create_idea" class="clearfix" action="{{url('/idea')}}" method="post" enctype="multipart/form-data">
  <input type="hidden" name="_token" value="{{ csrf_token() }}">

     <div class="form form-post-idea">
     <div class="left-input"><h3>Project Title:</h3></div>
     <label for="project_title"></label>
     <input type="text" name="idea_title" class="txt fill-width project_title" placeholder="Project Title"/>

     <label for="project_image"><h3>Project Image:</h3></label>
     <input type="file" name="idea_image" class="txt fill-width project_image" placeholder="Project Image" value=""/>

     <label for="project_info"><h3>Short Info of Project:</h3></label>
     <textarea name="idea_info" class="txt fill-width" placeholder="Info should not exceed 150 characters."></textarea>

     <label for="project_community"><h3>Project Community:</h3></label>
     <select class="txt fill-width project_community" name="selection[]" multiple>
        @foreach($Community as $selectCommunity)
          <option>{{$selectCommunity->community_name}}</option>
        @endforeach
    </select>

    <label for="project_location"> <h3>Project Location:</h3></label>
    <input id="project_location" type="text" name="idea_location" class="txt fill-width idea_location" placeholder="Project Location" value=""/>

    <label for="funding_goal"><h3>Funding Goal:</h3></label>
    <input id="funding_goal" type="number" name="idea_goal" class="txt fill-width idea_goal" placeholder="Amout needed to complete Project" value=""/>

    <label for="project_description"><h3>Project Description:</h3></label>
    <textarea id="content" name="idea_description" class="txt fill-width" placeholder="Project Description"></textarea>
    <label for="submit_for_review"></label><br /><br />
    <input type="submit" class="btn btn-green btn-buck-project" value="Submit For Review" id="review">
  </div>
</form>

Answer 1

在行中添加关系

 $idea->communities()->attach($request->input('selection'));

没有idea_id添加到数据透视表，因为您没有将创意对象保存到数据库。在此之前，您需要使用它的所有属性保存它，然后添加关系。另外，正如您在查询中看到的那样，您不会从您的请求中传递community_id，但我认为您的社区名称也是一个问题。

更新后修改

您还应该从视图中传递community_id的值。

@foreach($Community as $selectCommunity)
   <option value="{{$selectCommunity->community_id}}">{{$selectCommunity->community_name}}</option>
@endforeach

Answer 2

执行此操作的一种方法是首先保存您的创意记录，然后创建一个IdeaComunnity对象，设置相应的ID（想法和社区）并保存此对象。

您的错误可能是因为您的Idea对象尚未保存，因此，您有此约束异常。