红宝石：2.0.0p0，Rails：3.2.13
我的rake routes：
questions GET /questions(.:format) questions#index
POST /questions(.:format) questions#create
new_question GET /questions/new(.:format) questions#new
edit_question GET /questions/:id/edit(.:format) questions#edit
question GET /questions/:id(.:format) questions#show
PUT /questions/:id(.:format) questions#update
DELETE /questions/:id(.:format) questions#destroy
QuestionsCotroller: 类 QuestionsController < ApplicationController
class QuestionsController < ApplicationController
def index
@questions = Question.all
end
def show
@question = Question.find(params[:id])
end
def new
@question = Question.new
end
def create
@question = Question.new(params[:question])
# @question.save!
# flash[:notic] = 'Page saved'
# redirect_to :action => 'index'
# rescue ActiveRecord::RecordInvalid
# render :action => 'new'
respond_to do |format|
if @question.save
format.html { redirect_to(@question,
:notice => 'question was successfully created.') }
format.json { render :json => @question,
:status => :created, :location => @question }
else
format.html { render :action => "new" }
format.json { render :json => @question.errors,
:status => :unprocessable_entity }
end
end
end
def edit
@question = Question.find(params[:id])
end
def update
@question = Question.find(params[:id])
# if @question.save
# redirect_to(question_path(@question.id), :notice => t("success update"))
# else
# render :action => "new"
# end
respond_to do |format|
if @question.update_attributes(params[:id])
format.html { redirect_to(@question,
notic: "Question #{@question.title} was successfully updated") }
format.json { head :no_content }
else
format.html { render action: "edit" }
end
end
end
end
和edit.html.erb：
<div class="content">
<div class="box">
<%= render 'form' %>
</div>
</div>
_form.html.erb：
<%= simple_form_for @question do |f| %>
<fieldset>
<legend><%= @question.new_record? ? t("question.create_topic") : t("questions.edit_topic") %></legend>
<%= f.input :title, :input_html => { :class => "span6" } %>
<%= f.input :content, :as => :text, :input_html => { :class => "span6" } %>
<%= f.button :submit, :class => 'btn-primary' %>
<%= link_to 'Cancel', @question.id.blank? ? questions_path : question_path(params[:question]), :class => "btn btn-danger" %>
</fieldset>
<% end %>
我可以访问localhost:3000/questions/1，但是当我访问localhost:3000/questions/1/edit时，会出现 error: No route matches {:action=>"show", :controller=>"questions", :id=>nil}。
什么课程可能会出现这个问题？如果您需要更多信息，请告诉我。