出于某种原因，我无法让它发挥作用。
提供有许多回复，而回复有很多回复
我正在尝试在_response.html.erb中显示回复表单（见下文），当我转到http://localhost:3000/offerings/4时，它会抛出此错误：
ActionController::RoutingError at /offerings/4
No route matches {:action=>"create", :controller=>"replies", :offering_id=>#<Offering id: 4, user_id: 1, description: "help you fish ", created_at: "2013-07-30 02:59:38", updated_at: "2013-07-30 02:59:38">, :response_id=>#<Response id: nil, user_id: nil, offering_id: nil, body: nil, created_at: nil, updated_at: nil>, :format=>#<Reply id: nil, user_id: nil, response_id: nil, body: nil, created_at: nil, updated_at: nil>}
rake路线给了我这个：
root / dashboard#index
users POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
sessions POST /sessions(.:format) sessions#create
new_session GET /sessions/new(.:format) sessions#new
need_applicants GET /needs/:need_id/applicants(.:format) applicants#index
POST /needs/:need_id/applicants(.:format) applicants#create
new_need_applicant GET /needs/:need_id/applicants/new(.:format) applicants#new
edit_need_applicant GET /needs/:need_id/applicants/:id/edit(.:format) applicants#edit
need_applicant GET /needs/:need_id/applicants/:id(.:format) applicants#show
PUT /needs/:need_id/applicants/:id(.:format) applicants#update
DELETE /needs/:need_id/applicants/:id(.:format) applicants#destroy
needs GET /needs(.:format) needs#index
POST /needs(.:format) needs#create
edit_need GET /needs/:id/edit(.:format) needs#edit
need GET /needs/:id(.:format) needs#show
PUT /needs/:id(.:format) needs#update
DELETE /needs/:id(.:format) needs#destroy
offering_response_replies POST /offerings/:offering_id/responses/:response_id/replies(.:format) replies#create
offering_responses POST /offerings/:offering_id/responses(.:format) responses#create
offerings GET /offerings(.:format) offerings#index
POST /offerings(.:format) offerings#create
edit_offering GET /offerings/:id/edit(.:format) offerings#edit
offering GET /offerings/:id(.:format) offerings#show
PUT /offerings/:id(.:format) offerings#update
DELETE /offerings/:id(.:format) offerings#destroy
register /register(.:format) users#new
login /login(.:format) sessions#new
/offerings(.:format) offerings#index
/needs(.:format) needs#index
dashboard /dashboard(.:format) dashboard#index
contact /contact(.:format) contact#index
your_offerings /your_offerings(.:format) offerings#your_offerings
your_needs /your_needs(.:format) needs#your_needs
search /search(.:format) offerings#search
logout DELETE /logout(.:format) sessions#destroy
routes.rb的一部分：
resources :offerings, except: [:new] do
resources :responses, only: [:create] do
resources :replies, only: [:create]
end
end
_response.html.erb：
<%
if !logged_in?
user_id = 'not logged in'
else
user_id = current_user.id
end
# check whether the response is by
# the person who posted this offering
# or by the person currently logged in
# otherwise don't show the response
if response.user_id == user_id or @offering.user_id == response.user_id %>
<li class="well">
<%= response.body %> - by <%= response.user.username.capitalize %>
</li>
<div id="post-reply">
<h2>Reply to your Response</h2>
<% if logged_in? %>
<%= render 'replies/reply_form' %>
<% end %>
</div>
<% end %>
_reply_form.html.erb：
<%= form_for(offering_response_replies_path(@offering, @response, @reply)) do |f| %>
<%= render 'common/form_errors', object: @reply %>
<%= f.label :body, "Your Reply" %>
<%= f.text_area(:body, :rows => 10, :class => "field span6") %>
<%= f.submit "Post Reply", :class => "block" %>
<% end %>
replies_controller.rb：
class RepliesController < ApplicationController
before_filter :auth, only: [:create]
def create
@offering = Offering.find(params[:offering_id])
@response = @offering.responses.build(params[:response])
@reply = @response.replies.build(params[:reply])
@reply.user = current_user
if @reply.save
flash[:success] = 'your reply has been posted!'
redirect_to @offering
else
@offering = Offering.find(params[:offering_id])
render 'offerings/show'
end
end
end