Question

我正在尝试为网站管理员创建一个表单，以便将事件与之前的发言人列表相关联。管理员导航到扬声器，单击“添加到事件”按钮，然后会出现一个表格，询问发言人正在参加哪个活动。扬声器应该作为隐藏字段传入，并通过集合选择列出事件。不幸的是，当我提交表单时，发言人ID没有传入数据库。

为什么我的表单不保存隐藏字段中的值，我该如何修复它？集合选择中的值正在传递。

<%= form_for(@event_speaker) do |f| %>
  <% if @event_speaker.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@event_speaker.errors.count, "error") %> prohibited this event_speaker from being saved:</h2>

      <ul>
      <% @event_speaker.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <p><%= @speaker.first_name %></p>
  <div class="actions">
    <%= @speaker.id %>
    <%= f.hidden_field(:speaker) %>
    <%= hidden_field_tag('speaker_id',@speaker.id)  %>
  </div>
  <div class="field">
    <%= f.label :event %><br>
    <%= f.collection_select(:event_id, @upcoming_events, :id, :name)%>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

控制器：

def new
    @event_speaker = EventSpeaker.new
    @speaker = Speaker.find(params[:speaker_id])
    @event_speaker.speaker_id = @speaker
    @Time = Time.now
    @upcoming_events = Event.all
  end

  # GET /event_speakers/1/edit
  def edit
  end

  # POST /event_speakers
  # POST /event_speakers.json
  def create
    @event_speaker = EventSpeaker.new(event_speaker_params)

    respond_to do |format|
      if @event_speaker.save
        format.html { redirect_to @event_speaker, notice: 'Event speaker was successfully created.' }
        format.json { render action: 'show', status: :created, location: @event_speaker }
      else
        format.html { render action: 'new' }
        format.json { render json: @event_speaker.errors, status: :unprocessable_entity }
      end
    end
  end

和...

 def event_speaker_params
      params.require(:event_speaker).permit(:speaker_id,:event_id) 
    end

Answer 1

你应该做

<%= f.hidden_field :speaker_id, :value => @speaker.id %>

这会生成嵌套在event_speaker 中的 speaker_id，因此您的表单将如下所示：

<%= form_for(@event_speaker) do |f| %> <% if @event_speaker.errors.any? %> <div id="error_explanation"> <h2><%= pluralize(@event_speaker.errors.count, "error") %> prohibited this event_speaker from being saved:</h2> <ul> <% @event_speaker.errors.full_messages.each do |msg| %> <li><%= msg %></li> <% end %> </ul> </div> <% end %> <p><%= @speaker.first_name %></p> <div class="actions"> <%= f.hidden_field :speaker_id, :value => @speaker.id %> </div> <div class="field"> <%= f.label :event %><br> <%= f.collection_select(:event_id, @upcoming_events, :id, :name)%> </div> <div class="actions"> <%= f.submit %> </div> <% end %>

有关详细信息，请参阅rails
中的hidden field

Rails：隐藏字段不传递值

1 个答案: