好的......我是rails的新手,所以这可能是一个愚蠢的问题,但需要帮助。我刚刚观看并实施了关于建立博客的Ryan Bates screencaset。你可以在http://media.rubyonrails.org/video/rails_blog_2.mov看到它。这是瘦的:
两个表:帖子和评论。一切都很好,包括通过AJAX添加评论。此博客的默认开发为您提供index.html.erb视图,您可以在其中查看所有帖子
def index
@posts = Post.all
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @posts }
format.json { render :json => @posts }
format.atom
end
end
评论只能通过show.html.erb页面查看,并通过该文件中的代码显示:
<%= render :partial => @post %>
<p>
<%= link_to 'Edit', edit_post_path(@post) %> |
<%= link_to 'Destroy', @post, :method => :delete, :confirm => "Are You Sure" %> |
<%= link_to 'See All Posts', posts_path %>
</p>
<h2>Comments</h2>
<div id="comments">
<%= render :partial => @post.comments %>
</div>
<% remote_form_for [@post, Comment.new] do |f| %>
<p>
<%= f.label :body, "New Comment" %><br/>
<%= f.text_area :body %>
</p>
<p><%= f.submit "Add Comment"%></p>
<% end %>
我想要做的是获得index.html.erb视图中存在的注释功能的similair表示(我将使用javascript隐藏)。目前看起来像这样:
<h1>Listing posts</h1>
<%= render :partial => @posts %>
<%= link_to 'New post', new_post_path %>
我最初的想法是将这个完全相同的代码放在index.html.erb文件中的show.html.erb文件中,但这不起作用。我在这里尝试了很多东西,但我对Rails(或编码)的熟悉程度还不够及时。我得到两个主要错误。要么是我传递了nil.comments错误,要么是未定义的对象/方法(不记得了)。
我的问题是我需要包含在post_controller,comments_controller和index.html.erb文件中才能完成此任务。为了完整,我在下面的每个代码中都包含了代码。
POSTS_CONTROLLER
class PostsController < ApplicationController
before_filter :authenticate, :except => [:index, :show]
# GET /posts
# GET /posts.xml
def index
@posts = Post.all
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @posts }
format.json { render :json => @posts }
format.atom
end
end
# GET /posts/1
# GET /posts/1.xml
def show
@post = Post.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @post }
end
end
# GET /posts/new
# GET /posts/new.xml
def new
@post = Post.new
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @post }
end
end
# GET /posts/1/edit
def edit
@post = Post.find(params[:id])
end
# POST /posts
# POST /posts.xml
def create
@post = Post.new(params[:post])
respond_to do |format|
if @post.save
flash[:notice] = 'Post was successfully created.'
format.html { redirect_to(@post) }
format.xml { render :xml => @post, :status => :created, :location => @post }
else
format.html { render :action => "new" }
format.xml { render :xml => @post.errors, :status => :unprocessable_entity }
end
end
end
# PUT /posts/1
# PUT /posts/1.xml
def update
@post = Post.find(params[:id])
respond_to do |format|
if @post.update_attributes(params[:post])
flash[:notice] = 'Post was successfully updated.'
format.html { redirect_to(@post) }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @post.errors, :status => :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.xml
def destroy
@post = Post.find(params[:id])
@post.destroy
respond_to do |format|
format.html { redirect_to(posts_url) }
format.xml { head :ok }
end
end
private
def authenticate
authenticate_or_request_with_http_basic do |name, password|
name == "admin" && password == "secret"
end
end
end
COMMENTS_CONTROLLER
class CommentsController < ApplicationController
def create
@post = Post.find(params[:post_id])
@comment = @post.comments.create!(params[:comment])
respond_to do |format|
format.html { redirect_to @post}
format.js
end
end
end
INDEX.HTML.ERB
<h1>Listing posts</h1>
<%= render :partial => @posts %>
<%= link_to 'New post', new_post_path %>
答案 0 :(得分:2)
这是一个简单的解决方案。第1步,编辑索引操作以包含属于每个帖子的所有评论。
def index
@posts = Post.all(:include => :comments)
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @posts }
format.json { render :json => @posts }
format.atom
end
end
步骤2,编辑索引视图以显示每个帖子,然后显示其评论:
<h1>Listing posts</h1>
<% @posts.each do |post| %>
<%= render :partial => post %>
<%= render :partial => post.comments %>
<% end %>
<%= link_to 'New post', new_post_path %>
编辑:我不是100%确定包含评论创建表单的最佳方式。我首先尝试的是(在index.html.erb中):
尝试将索引视图更改为:
<h1>Listing posts</h1>
<% @posts.each do |post| %>
<%= render :partial => post %>
<%= render :partial => post.comments %>
<% remote_form_for [post, Comment.new] do |f| %>
<p>
<%= f.label :body, "New Comment" %><br/>
<%= f.text_area :body %>
</p>
<p><%= f.submit "Add Comment"%></p>
<% end %>
<% end %>
<%= link_to 'New post', new_post_path %>
这应该在该帖子的评论下呈现给定帖子的“新评论”表单,但我不确定(实际上没有尝试)表单提交AJAX是否将成功更新并刷新索引页面。