Question

我希望我不会问一个明显的问题/不会因为这个而投下地狱。我正在使用rails app而且我得到了一个“param is missing or value is empty”错误。

我有一个已经创建的事件和问题，并且我使用嵌套表单允许用户一次回答所有问题。

我正在使用rails 4

模型

class Event < ActiveRecord::Base
    belongs_to :user
    has_many :questions
    accepts_nested_attributes_for :questions, allow_destroy: true
end

class Question < ActiveRecord::Base

   belongs_to :user
   belongs_to :event

   has_many :answers
   accepts_nested_attributes_for :answers, allow_destroy: true
end

class Answer < ActiveRecord::Base

   belongs_to :user
   belongs_to :question

end

的routes.rb

Rails.application.routes.draw do
root 'home#index'

devise_for :users, path_names: {sign_in: "login", sign_out: "logout"}, controllers:           {omniauth_callbacks: "omniauth_callbacks"}

resources :answers
resources :users, only: [:new, :create]

resources :questions do
   resources :answers #-> domain.com/questions/1/answers/new
end

resources :events, only: [:index, :new, :show, :update] do
   patch ":id", action: :index
   collection do
       get :favorite
       get "question/:id", action: :question
   end
end

get 'users/new', to: 'users#new'
post 'users/new', to: 'users#create'
get 'events/favorite', to: 'events#favorite', via:[:get], as: 'favorite'
post 'events/:id' => 'events#update'
get 'answers/new' => 'answers#new'
get 'events/question' => 'events#question'

end

回答控制器

class AnswersController < ApplicationController
def new
  @event = Event.find(params[:id])
  @answer = Answer.new
end

def show

end

def create
    @answer = Answer.new(answer_params)
    @answer.save
    redirect_to events_path, notice: "Answered Questions"
end

private
    def answer_params
       params.require(:answer).permit(:response, :question, :event, :user, :event_id, :question_id, :user_id)
    end
end

这就是我的问题所在。最初我有一个非常通用的嵌套来自la http://railscasts.com/episodes/196-nested-model-form-revised，但我将form_for切换到@answer，因为这是创建并切换到button_to，因为提交按钮没有写出DB的答案。我相信它试图用@event触发一些东西

<h1>New answers</h1>

<%= fields_for @event do |f| %>  
  <p>
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </p>
    <%= f.fields_for :questions do |b| %>
  <p>
        <%= b.text_field :poll%><br />
            <%= form_for @answer do |x| %>      
                <%= x.text_field :response %>
            <% end %>
   </p>
  <% end %>
  <%= button_to "New", action: "create"%>
<% end %>
<%= link_to 'Back', answers_path %>

如果您需要更多代码或有任何问题，请告诉我

谢谢！

更新

我已根据此博文http://iroller.ru/blog/2013/10/14/nested-model-form-in-rails-4/

重新编写了我的代码

现在我通过事件控制器运行更新，或者至少我正在尝试。代码如下，现在得到的错误是

未定义的局部变量或方法`event_params'用于＃

感谢男女老少抱歉愚蠢的问题

模型

 class Event < ActiveRecord::Base
   belongs_to :user
   has_many :questions
   accepts_nested_attributes_for :questions
  end

  class Question < ActiveRecord::Base 
   belongs_to :user
   belongs_to :event
   has_many :answers
   accepts_nested_attributes_for :answers
  end

  class Answer < ActiveRecord::Base
    belongs_to :user
    belongs_to :question
  end

的routes.rb

  Rails.application.routes.draw do
  root 'home#index'

  devise_for :users, path_names: {sign_in: "login", sign_out: "logout"}, controllers:        {omniauth_callbacks: "omniauth_callbacks"}

   resources :answers
   resources :users, only: [:new, :create]

   resources :questions do
     resources :answers #-> domain.com/questions/1/answers/new
   end

   resources :events, only: [:index, :new, :show, :update] do
     patch ":id", action: :index
     collection do
     get :favorite
     get "question/:id", action: :question
   end
  end

  get 'users/new', to: 'users#new'
  post 'users/new', to: 'users#create'
  get 'events/favorite', to: 'events#favorite', via:[:get], as: 'favorite'
  post 'events/:id' => 'events#update'
  get 'answers/new' => 'answers#new'
  get 'events/question' => 'events#question'
 end

来自events_controller的

方法

 def question
   @event = Event.find(params[:id])
 end 


 def update
   @event = Event.find(params[:id])

 if @event.update(event_params)
    redirect_to events_path, notice: "Answers saved"
  else
    redirect_to events_question_path, notice: "Answers not saved"
 end

questions.erb

 <%= simple_form_for(@event) do |f| %>
   <%= f.error_notification %>
   <%= f.object.name %>

  <%= f.simple_fields_for :questions, f.object.questions do |q| %>
    <%= q.object.poll%>
  <%= q.simple_fields_for :answers, q.object.answers.build do |a|%>
    <%= a.text_field :response %>
  <% end %>
 <%end %>
 <%= f.button :submit%>
 <% end %>

嵌套模型表单缺少param或值为空错误

0 个答案: