爲什麼我的嵌套表單不能正確提交數據？

Question

社區has_many社區話題
它顯示了CommunityTopics的形式當我訪問example.com/shop/WALMART/topic/new
並在提交後創建新記錄。
但所有我輸入的數據將不會被保存，所有的人都變成空:(

我的代碼是

的routes.rb

resources :communities, :path => "shop", do 
    resources :community_topics, :path => "topic", :as => :'topic' 
end 

型號/ community.rb

def to_param 
    "#{community_name}" 
end 

community_topics_controller.rb #NEW

def new 
    @community = Community.find_by_community_name(params[:community_id]) 
    @community_topic = @community.community_topics.build 
    @community_topic.user_id = current_user.id 


    respond_to do |format| 
     format.html # new.html.erb 
     format.json { render json: @community_topic } 
    end 
    end 

community_topics_controller.rb＃創建

def create 
    @community = Community.find_by_community_name(params[:community_id]) 
    @community_topic = @community.community_topics.build (params[:id]) 

    respond_to do |format| 
     if @community_topic.save 
     format.html { redirect_to community_topic_path(@community.community_name, @community_topic), notice: 'Community topic was successfully created.' } 
     format.json { render json: [@community, @community_topic], status: :created, location: @community_topic } 
     else 
     format.html { render action: "new" } 
     format.json { render json: @community_topic.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

視圖/ community_topics/_form.html.erb

<%= form_for :community_topic, url: community_topic_index_url, :html => { :class => 'form-horizontal' } do |f| %> 
    <div class="control-group"> 
    <%= f.label :community_id, :class => 'control-label' %> 
    <div class="controls"> 
     <%= f.number_field :community_id, :class => 'number_field' %> 
    </div> 
    </div> 
    <div class="control-group"> 
    <%= f.label :user_id, :class => 'control-label' %> 
    <div class="controls"> 
     <%= f.number_field :user_id, :class => 'number_field' %> 
    </div> 
    </div> 
    <div class="control-group"> 
    <%= f.label :title, :class => 'control-label' %> 
    <div class="controls"> 
     <%= f.text_field :title, :class => 'text_field' %> 
    </div> 
    </div> 
    <div class="control-group"> 
    <%= f.label :body, :class => 'control-label' %> 
    <div class="controls"> 
     <%= f.text_area :body, :class => 'text_area' %> 
    </div> 
    </div> 

    <div class="form-actions"> 
    <%= f.submit nil, :class => 'btn btn-primary' %> 
    <%= link_to t('.cancel', :default => t("helpers.links.cancel")), 
       community_topic_index_path, :class => 'btn' %> 
    </div> 
<% end %> 

Answer 1

看看這個線

@community_topic = @community.community_topics.build (params[:id]) 

你將錯誤的參數傳遞給了那個。應該是

params[:community_topic] :)