我从views / comments / _comment.html.erb收到错误，其中第27行 undefined方法`回复'为nil：NilClass
我正在尝试添加对我的评论的回复。但出了点问题。
这是我的代码。
的routes.rb
resources :movies do
resources :comments do
resources :replies
end
end
在控制器中
replies_controller.rb
class RepliesController < ApplicationController
before_filter :signed_in_user, only: [:create, :destroy]
def create
@comment = Comment.find(params[:comment_id])
@movie = Movie.find(params[:movie_id])
@reply = @comment.replies.build(reply_params)
@reply.comment = @comment
@reply.user = current_user
@reply.save
redirect_to @movie
end
def destroy
@comment = Comment.find(params[:comment_id])
@movie = Movie.find(params[:movie_id])
@reply = Reply.find(params[:id])
@reply.destroy
redirect_to @movie
end
private
# Never trust parameters from the scary internet, only allow the white list through.
def reply_params
params.require(:reply).permit(:comment_id, :user_id, :body)
end
端
comment_controller.rb
class CommentsController < ApplicationController
before_filter :signed_in_user, only: [:create, :destroy]
def create
@movie = Movie.find(params[:movie_id])
@comment = @movie.comments.build(comment_params)
@comment.movie = @movie
@comment.user = current_user
@comment.save
redirect_to @movie
end
def destroy
@movie = Movie.find(params[:movie_id])
@comment = Comment.find(params[:id])
@comment.destroy
redirect_to @movie
end
private
# Never trust parameters from the scary internet, only allow the white list through.
def comment_params
params.require(:comment).permit(:movie_id, :user_id, :body)
end
端
在模型中
replies.rb
class Reply < ActiveRecord::Base
belongs_to :comment
belongs_to :user
end
comments.rb
class Comment < ActiveRecord::Base
belongs_to :movie
belongs_to :user
has_many :replies
default_scope {order('comments.created_at DESC')}
def self.from_users_followed_by(user)
followed_user_ids = "SELECT followed_id FROM relationships
WHERE follower_id = :user_id"
where("user_id IN (#{followed_user_ids}) OR user_id = :user_id",user_id: user.id)
end
end
观看
评论/ _comment.html.erb
<%= div_for comment do %>
<p>
<strong>
<span class="user">
<%= link_to comment.user.name, comment.user %>
</span>
</strong>
Posted <%= time_ago_in_words(comment.created_at) %> ago
<br/>
<strong>
<span class="name">
<%= link_to comment.movie.name, comment.movie %>
</span>
</strong>
<%= comment.body %>
<br/>
<% if current_user?(comment.user) %>
<%= link_to "delete", [comment.movie, comment], method: :delete,
data: { confirm: "You sure?" },
title: comment.body %>
<% end %>
</p>
<div id="reply">
<%= render :partial => @comment.replies %>
</div>
<%= form_for [@comment, Reply.new] do |f| %>
<p>
<%= f.label :body, "New reply" %><br/>
<%= f.text_area :body %>
</p>
<p><%= f.submit "Add reply" %></p>
<% end %>
<% end %>
replies/_reply.html.erb
<%= div_for reply do %>
<p>
<strong>
<span class="user">
<%= link_to reply.user.name, reply.user %>
</span>
</strong>
Posted <%= time_ago_in_words(reply.created_at) %> ago
<br/>
<%= reply.body %>
<br/>
<% if current_user?(reply.user) %>
<%= link_to "delete", [reply.comment, reply], method: :delete,
data: { confirm: "You sure?" },
title: reply.body %>
<% end %>
</p>
<% end %>
感谢您的帮助！
我改变了
<div id="reply">
<%= render :partial => @comment.replies %>
</div>
进入
<div id="reply">
<%= render :partial => comment.replies %>
</div>
并且错误消失了
但是我收到了一个新的错误 views / comments / _comment.html.erb第30行
undefined method `replies_path' for #<#<Class:0x007ff737a8d4d8>:0x007ff736c018d8>
这里是comments / _comment.html.erb
<%= div_for comment do %>
<p>
<strong>
<span class="user">
<%= link_to comment.user.name, comment.user %>
</span>
</strong>
Posted <%= time_ago_in_words(comment.created_at) %> ago
<br/>
<strong>
<span class="name">
<%= link_to comment.movie.name, comment.movie %>
</span>
</strong>
<%= comment.body %>
<br/>
<% if current_user?(comment.user) %>
<%= link_to "delete", [comment.movie, comment], method: :delete,
data: { confirm: "You sure?" },
title: comment.body %>
<% end %>
</p>
<div id="reply">
<%= render :partial => comment.replies %>
</div>
<%= form_for [@comment, Reply.new] do |f| %>
<p>
<%= f.label :body, "New reply" %><br/>
<%= f.text_area :body %>
</p>
<p><%= f.submit "Add reply" %></p>
<% end %>
<% end %>
回复和评论的路线
Prefix Verb URI Pattern Controller#Action
movie_comment_replies GET /movies/:movie_id/comments/:comment_id/replies(.:format) replies#index
POST /movies/:movie_id/comments/:comment_id/replies(.:format) replies#create
new_movie_comment_reply GET /movies/:movie_id/comments/:comment_id/replies/new(.:format) replies#new
edit_movie_comment_reply GET /movies/:movie_id/comments/:comment_id/replies/:id/edit(.:format) replies#edit
movie_comment_reply GET /movies/:movie_id/comments/:comment_id/replies/:id(.:format) replies#show
PATCH /movies/:movie_id/comments/:comment_id/replies/:id(.:format) replies#update
PUT /movies/:movie_id/comments/:comment_id/replies/:id(.:format) replies#update
DELETE /movies/:movie_id/comments/:comment_id/replies/:id(.:format) replies#destroy
movie_comments GET /movies/:movie_id/comments(.:format) comments#index
POST /movies/:movie_id/comments(.:format) comments#create
new_movie_comment GET /movies/:movie_id/comments/new(.:format) comments#new
edit_movie_comment GET /movies/:movie_id/comments/:id/edit(.:format) comments#edit
movie_comment GET /movies/:movie_id/comments/:id(.:format) comments#show
PATCH /movies/:movie_id/comments/:id(.:format) comments#update
PUT /movies/:movie_id/comments/:id(.:format) comments#update
DELETE /movies/:movie_id/comments/:id(.:format) comments#destroy
答案 0 :(得分：0)
一般情况下，要在堆栈跟踪中的文件和行号调试此类事物，请查看哪个变量意外为零，然后查看原因。
没有那个，我的第一个猜测就是你评论部分的这一行：
<%= render :partial => @comment.replies %>
如果堆栈跟踪指向此处，请尝试将@comment更改为comment。如果使用render @comments从父视图渲染部分，则在该部分中变量将是普通的局部变量。
如果不是这样，那么请将视图发布到您正在呈现注释的部分，以及足够的堆栈跟踪以显示发生错误的文件和行号。
更新： 这一行：
<%= form_for [@comment, Reply.new] do |f| %>
应该看起来更像：
<%= form_for(Reply.new) do |f| %>
<%= f.hidden_field(:comment_id, @comment.id) %>
这样新的回复将包含当前评论的链接，但是提交此表单现在应该将其发送到replies_controller #create方法。