没有路由错误传递参数时通过的link_to

Question

错误：

No route matches {:action=>"new", :controller=>"comments", :parent_id=>1}

的routes.rb：

MyApp::Application.routes.draw do 
    resources :posts do 
    resources :comments 
    end 
    resources :topics do 
    resources :posts 
    end 
    root :to => "posts#index" 
end 

型号：

class Topic < ActiveRecord::Base 
    has_many  :posts, :dependent => :destroy 
    attr_accessible :name, :post_id 
end 

class Post < ActiveRecord::Base 
    belongs_to :topic, :touch => true 
    has_many :comments, :dependent => :destroy 
    accepts_nested_attributes_for :topic 
    attr_accessible :name, :title, :content, :topic, :topic_attributes 
end 

class Comment < ActiveRecord::Base 
    has_ancestry 
    attr_accessible :name, :content 
    belongs_to  :post, :touch => true 
end 

观点：

<%= link_to "Reply", new_post_comment_path(@post, :parent_id => comment.id) %> 

控制器：

class CommentsController < ApplicationController 
    respond_to :html, :xml 
    def show 
    @post = Post.find(params[:id]) 
    @comments = @post.comments.order("updated_at").page(params[:page]) 
    end 

    def create 
    @post = Post.find(params[:post_id]) 
    @comment = @post.comments.build(params[:comment]) 
    if @comment.save 
     flash[:notice] = "Replied to \"#{@post.title}\"" 
     redirect_to(@post) 
    else 
     flash[:notice] = "Reply failed to save." 
     redirect_to(@post) 
    end 
    end 

    def new 
    @post = Post.find(params[:post_id]) 
    @comment = Comment.new(:parent_id => params[:parent_id]) 
    # @comment = @post.comments.build 
    end 

    def destroy 
    @post = Post.find(params[:post_id]) 
    @comment = @post.comments.find(params[:id]) 
    @comment.destroy 
    redirect_to post_path(@post) 
    end 
end 

通过阅读代码，你可能已经收集，我试图让ancestry宝石与嵌套资源工作。我一直在使用Acesstry gem上的Railscasts插曲来指导我。感谢您阅读我的问题。

Answer 1

试图通过评论ID

link_to "Reply", new_post_comment_path(@post, :parent_id => comment.id). 

Answer 2

您需要使用嵌套路径：link_to "Reply", new_post_comment_path(@post, :parent_id => comment)。

rake routes可以成为你的朋友。