我正在尝试设置一个javascript前端,就是从Rails后端消耗JSON。
唯一的问题是,当我在Rails中嵌套模型时,我不确定返回的JSON是否格式正确。
我有发布模型和评论模型。帖子有很多评论。每个模型都有一个“标题”和“内容”字段。
到目前为止,这是我的问题......
1)当我访问网址时:http://localhost:3000/posts.json
我得到了预期的输出:
> [{"content":"My first
> post","created_at":"2012-02-07T18:56:16Z","id":1,"title":"Hello","updated_at":"2012-02-07T18:56:16Z"},{"content":"More
> crap","created_at":"2012-02-07T21:30:51Z","id":2,"title":"My 2nd
> Post","updated_at":"2012-02-07T21:30:51Z"}]
2)如果我输入此网址:http://localhost:3000/posts/1/comments/4.json
我也得到了预期的结果:
> {"content":"that's
> nice","created_at":"2012-02-07T20:57:16Z","id":4,"post_id":1,"title":"cool","updated_at":"2012-02-07T20:57:16Z"}
3)但是......如果我输入这样的网址:http://localhost:3000/posts/1/comments.json
返回 null
。
我无法访问与帖子关联的评论列表的JSON版本。
使用标准的Rails视图,我可以使用嵌套做完整的CRUD没有问题,但是我是否需要做一些与Rails通常传递JSON的方式不同的东西,以便在客户端使用它?
修改
我假设您可能需要查看注释控制器的控制器代码。这是:
class CommentsController < ApplicationController
before_filter :get_post
respond_to :html, :xml, :json
def index
@comments = @post.comments.all
respond_with (@comment)
end
def show
@comment = @post.comments.find(params[:id])
respond_with(@comment)
end
def new
@comment = @post.comments.build
respond_with(@comment)
end
def edit
@comment = @post.comments.find(params[:id])
end
def create
@comment = @post.comments.build(params[:comment])
respond_to do |format|
if @comment.save
format.html { redirect_to([@post, @comment], :notice => 'Comment was successfully created.') }
format.xml { render :xml => @comment, :status => :created, :location => @comment }
format.json { render :json => @comment, :status => :created, :location => @comment }
else
format.html { render :action => "new" }
format.xml { render :xml => @comment.errors, :status => :unprocessable_entity }
format.json { render :json => @comment.errors, :status => :unprocessable_entity }
end
end
end
def update
@comment = @post.comments.find(params[:id])
respond_to do |format|
if @comment.update_attributes(params[:comment])
format.html { redirect_to(@comment, :notice => 'Comment was successfully updated.') }
format.xml { head :ok }
format.json { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @comment.errors, :status => :unprocessable_entity }
format.json { render :json => @comment.errors, :status => :unprocessable_entity }
end
end
end
def destroy
@comment = @post.comments.find(params[:id])
@comment.destroy
respond_to do |format|
format.html { redirect_to(post_comments_url) }
format.xml { head :ok }
format.json { head :ok }
end
end
protected
def get_post
@post = Post.find_by_id(params[:post_id])
redirect_to root_path unless @post
end
end
答案 0 :(得分:2)
def index
@comments = @post.comments.all
respond_with (@comment)
end
您未分配给@comment。