我是 Rails 的新手，正在申请大学成员（教师和学生）可以在其中创建帖子并对其发表评论。稍后我希望在其中添加嵌套（祖先）和积分系统。
我有帖子、评论和会员模型。Post 模型是通过 Scaffolding 制作的，Member 模型是在 Devise 的帮助下制作的，Comment 只是一个模型。
在我的帖子显示页面中，我想在帖子下方发表评论，我已经取得了一些进展（多亏了我才知道很多）但现在我遇到了一个问题，每当我尝试发布一条空白评论，rails 正在重定向到编辑页面。如何更改此设置以使 rails 仅停留在显示页面上并显示错误？
为此，我进行了一些搜索，在 post_controller.rb 中创建了一个新方法“update_comments”，并尝试修改 forms_for 标记属性，如下面的代码所示，但现在提交时出现路由错误。
应用程序/模型/member.rb
class Member < ActiveRecord::Base
#Associations
belongs_to :department
has_one :student, :dependent => :destroy
accepts_nested_attributes_for :student
has_one :nstudent, :dependent => :destroy
accepts_nested_attributes_for :nstudent
has_many :posts, :dependent => :destroy
has_many :comments, :dependent => :destroy
end
应用程序/模型/post.rb
class Post < ActiveRecord::Base
#Associations
belongs_to :member
has_many :comments, :dependent => :destroy
accepts_nested_attributes_for :comments
end
应用程序/模型/comment.rb
class Comment < ActiveRecord::Base
# Associations
belongs_to :member
belongs_to :post
validates_presence_of :content
end
配置/路由.rb
Urdxxx::Application.routes.draw do
devise_for :members
resources :posts do
member do
get 'update_comment'
end
end
root :to => 'posts#index'
应用程序/控制器/posts_controller.rb
class PostsController < ApplicationController
# Devise filter that checks for an authenticated member
before_filter :authenticate_member!
# GET /posts
# GET /posts.json
def index
@posts = Post.find(:all, :order => 'points DESC')
respond_to do |format|
format.html # index.html.erb
format.json { render json: @posts }
end
end
...
# GET /posts/1/edit
def edit
@post = Post.find(params[:id])
end
# POST /posts
# POST /posts.json
def create
@post = Post.new(params[:post])
@post.member_id = current_member.id if @post.member_id.nil?
respond_to do |format|
if @post.save
format.html { redirect_to @post, notice: 'Post was successfully created.' }
format.json { render json: @post, status: :created, location: @post }
else
format.html { render action: "new" }
format.json { render json: @post.errors, status: :unprocessable_entity }
end
end
end
# PUT /posts/1
# PUT /posts/1.json
def update
@post = Post.find(params[:id])
respond_to do |format|
if @post.update_attributes(params[:post])
format.html { redirect_to @post, notice: 'Post was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: @post.errors, status: :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.json
def destroy
@post = Post.find(params[:id])
@post.destroy
respond_to do |format|
format.html { redirect_to posts_url }
format.json { head :no_content }
end
end
# Not made by scaffold
def update_comment
@post = Post.find(params[:id])
respond_to do |format|
if @post.update_attributes(params[:post])
format.html { redirect_to @post, notice: 'Comment was successfully created.' }
format.json { head :no_content }
else
format.html { render action: "show" }
format.json { render json: @post.errors, status: :unprocessable_entity }
end
end
end
end
app/views/posts/show.html.erb
<p> Have your say </p>
<%= form_for @post, :url => {:action => 'update_comment'} do |p| %>
<%= p.fields_for :comments do |c| %>
<!-- Following 3 lines saved my life -->
<% if c.object.new_record? %>
<%= c.text_area :content, :rows => 4 %>
<%= c.hidden_field :member_id, value: current_member.id %>
<% end %>
<% end %>
<%= p.submit "Reply" %>
<% end %>
我的展示页面图片：http: //i.stack.imgur.com/TBgKy.png
发表评论：http: //i.stack.imgur.com/JlWeR.png
更新：
回过头来，按照肯所说的在这里进行了更改。我不知道如何，但它现在有效。
应用程序/控制器/posts_controller.rb
def update
@post = Post.find(params[:id])
respond_to do |format|
if @post.update_attributes(params[:post])
format.html { redirect_to @post, notice: 'Post was successfully updated.' }
format.json { head :no_content }
elsif :comments
format.html { render action: "show" }
format.json { render json: @post.errors, status: :unprocessable_entity }
else
format.html { render action: "edit" }
format.json { render json: @post.errors, status: :unprocessable_entity }
end
end
end