使用collection_select的表单,编辑操作完全有效但创建没有

时间:2014-09-29 18:12:51

标签: ruby-on-rails ruby ruby-on-rails-3 ruby-on-rails-4 collection-select

我正在使用以下表单和控制器。如果我创建一个新通知,除了campus_id之外,所有内容都会被保存。

虽然我从下拉列表中选择了不同的参数,但它似乎给出了错误的校园参数。如果我之后编辑相同的条目,它会被保存吗?发生了什么,我该如何解决?

相同的表单用于编辑和创建操作。 (这是部分的)

值得注意的是,我使用浅层路线进行校园(has_many)和通知(belongs_to)。

的routes.rb

  shallow do
    resources :campus do
      resources :notifications
    end
  end

形式:

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

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

  <div class="field">
    <%= f.label :post %><br>
    <%= f.text_area :post %>
  </div>
  <div class="field">
    <%= f.label :campus %><br>
    <%= f.collection_select(:campus_id, Campus.all.order('name ASC'), :id, :name, prompt: true) %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

这是控制器:

class NotificationsController < ApplicationController
  before_action :set_notification, only: [:show, :edit, :update, :destroy]
  before_action :set_campus, only: [:index, :new, :create]

  def index
    @notifications = @campus.notification
  end

  def show
  end

  def new
    @notification = @campus.notification.new
  end

  def edit
  end

  def create
    @notification = @campus.notification.new(notification_params)

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

  def update
    respond_to do |format|
      if @notification.update(notification_params)
        format.html { redirect_to @notification, notice: 'Notification was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @notification.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @notification.destroy
    respond_to do |format|
      format.html { redirect_to campu_notifications_url(1) }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_notification
      @notification = Notification.find(params[:id])
    end

    def set_campus
      @campus = Campus.find(params[:campu_id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def notification_params
      params.require(:notification).permit(:post, :campus_id)
    end
end

如果我查看日志,我会看到错误的参数被打了。

  

在84.193.153.106开始POST“/ campus / 1 / notifications”   2014-09-29 18:29:33 +0000开始POST“/ campus / 1 / notifications”for   84.193.153.106 at 2014-09-29 18:29:33 +0000 NotificationsController处理#create as HTML Processing by   NotificationsController #create as HTML参数:{“utf8”=&gt;“_”,   “authenticity_token”=&gt; “中oNSlEFeukwEj2hIAT89wFdIYwjHO5c8lzBlCqMyk31Y =”,   “notification”=&gt; {“post”=&gt;“sdqfdsfd”,“campus_id”=&gt;“3”},   “commit”=&gt;“创建通知”,“campu_id”=&gt;“1”}参数:   { “UTF8”=&gt; “中_”,   “authenticity_token”=&gt; “中oNSlEFeukwEj2hIAT89wFdIYwjHO5c8lzBlCqMyk31Y =”,   “notification”=&gt; {“post”=&gt;“sdqfdsfd”,“campus_id”=&gt;“3”},   “commit”=&gt;“创建通知”,“campu_id”=&gt;“1”}校园负载   (0.4ms)SELECT“campus”。* FROM“campus”WHERE“campus”。“id”= $ 1   LIMIT 1 [[“id”,“1”]]校园负荷(0.4ms)选择“校园”。* FROM   “校园”在哪里“校园”。“id”= $ 1 LIMIT 1 [[“id”,“1”]](0.1ms)   BEGIN(0.1ms)开始SQL(28.6ms)插入“通知”   (“campus_id”,“created_at”,“post”,“updated_at”)价值(1美元,2美元,3美元,   $ 4)返回“id”[[“campus_id”,1],[“created_at”,星期一,2014年9月29日   18:29:34 UTC +00:00],[“post”,“sdqfdsfd”],[“updated_at”,星期一,9月29日   2014 18:29:34 UTC +00:00]] SQL(28.6ms)INSERT INTO“notifications”   (“campus_id”,“created_at”,“post”,“updated_at”)价值(1美元,2美元,3美元,   $ 4)返回“id”[[“campus_id”,1],[“created_at”,星期一,2014年9月29日   18:29:34 UTC +00:00],[“post”,“sdqfdsfd”],[“updated_at”,星期一,9月29日   2014 18:29:34 UTC +00:00]](3.5ms)COMMIT(3.5ms)COMMIT

1 个答案:

答案 0 :(得分:2)

可能希望更改newcreate这样的操作:

def new
  @notification = @campus.notifications.build
end

def create
  @notification = @campus.notifications.build(notification_params)

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

campus.build_notification将实例化belongs_to campus的通知。使用new会要求您将notification[campus_id]作为参数的一部分传递。