我对Ruby on Rails的,在日本对不起制作一个简单的BBS。我刚刚得到这个错误信息
“NoMethodError在帖子#新”
显示/Users/igarashinobuo/portfolio/cpmybbs/app/views/posts/new.html.erb在行#7提出:
未定义的方法`岗位为无:NilClass
</div> <div class="mt-10 pd-20"> <% @topic.posts.order(:id).each.with_index(1) do |post , idx| %> <p> <%= idx %> <%= post.name %>
发生此错误,当我想访问“http://localhost:3002/topics/22/posts/new”。图22是柱的数目。新页面是微柱的页面。
# app/views/posts/new.html.erb
<div class="text-center bg-light font-weight-normal pt-3">
<a href=/topics>Chatty</a>
</div>
<div class="text-center pb-20 mt-10">
</div>
<div class="mt-10 pd-20">
<% @topic.posts.order(:id).each.with_index(1) do |post , idx| %>
<p>
<%= idx %>
<%= post.name %>
<%= post.body %>
</p>
<% end %>
</div>
<div class="newpost my-auto mb-60">
<h4>新規書き込み</h4>
<%= form_for @post, url: topic_posts_path(@topic) do |f| %>
<div class="post_area">
<p><%= f.text_field :name %></p>
<p><%= f.label :name %></p>
<p><%= f.text_field :name %></p>
<p><%= f.label :body %></p>
<p><%= f.text_area :body %></p>
<%= f.submit %>
</div>
<% end %>
# posts_controller.rb
class PostsController < ApplicationController
def new
@post = Post.new
end
def create
@post = @topic.posts.build(set_topic)
if @post.save
redirect_to new_topic_post_path(@topic)
else
render :new
end
end
private
def set_topic
@topic = Topic.find(params[:topic_id, :title])
end
def post_params
params.require(:post).permit(:name, :body)
end
end
# error log
app/views/posts/new.html.erb:7:in `_app_views_posts_new_html_erb__4195515470978617912_70184702044840'
Started GET "/topics/22/posts/new" for ::1 at 2019-02-06 11:52:00 +0900
Processing by PostsController#new as HTML
Parameters: {"topic_id"=>"22"}
Rendering posts/new.html.erb within layouts/application
Rendered posts/new.html.erb within layouts/application (3.3ms)
Completed 500 Internal Server Error in 11ms (ActiveRecord: 0.0ms)
ActionView::Template::Error (undefined method `posts' for nil:NilClass):
4: <div class="text-center pb-20 mt-10">
5: </div>
6: <div class="mt-10 pd-20">
7: <% @topic.posts.order(:id).each.with_index(1) do |post , idx| %>
8: <p>
9: <%= idx %>
10: <%= post.name %
你能帮我好心调试?
您需要添加一些对控制器的更改:
set_topic
,找到@topic
的每一个动作set_topic
了一下,由于某些原因,你试图通过寻找话题
params[:topic_id, :title]
,这是访问的哈希值无效路post_params
建立一个新的职位结果:
class PostsController < ApplicationController
before_action :set_topic
def new
@post = Post.new
end
def create
@post = @topic.posts.build(post_params)
if @post.save
redirect_to new_topic_post_path(@topic)
else
render :new
end
end
private
def set_topic
@topic = Topic.find(params[:topic_id])
end
def post_params
params.require(:post).permit(:name, :body)
end
end