Ruby on Rails 错误：未定义的方法“comments_path”

Question

我正在创建一个用户可以在其中评论帖子的应用。但是，我在尝试显示帖子时遇到错误：ArgumentError in PostsController#show First argument in form cannot contain nil or be empty

在我尝试render 'shared/comment_form'的那一行失败了

这是我的posts/show.html.erb：

<% provide(:title, @post.title) %>
  <div class="post-details">
    <div class="post-title">@post.title</div>
    <div class="post-url">@post.url</div>
    <div class="post-content">@post.content</div>
    <%= render 'shared/comment_form' if logged_in? %>
    <% if @post.comments.any?  %>
      <h3>Comments</h3>
      <ol class="comments">
        <%= render @comments  %>
      </ol>
    <% end  %>
  </div>

还有我的posts_controller.rb：

类 PostsController

 def create
   @post = current_user.posts.build(post_params)
   if @post.save
     flash[:success] = "Post created!"
     redirect_to root_url
   else
     @feed_items = []
     render 'static_pages/home'
   end
 end

 def show
   @post = Post.find(params[:id])
 end

 private

   def post_params
     params.require(:post).permit(:title, :url)
   end
end

这是我的 shared/_comment_form.html.erb 部分：

<%= form_for(Comment.new) do |f| %>
  <%= render 'shared/error_messages', object: f.object %>
   <div class="field">
      <%= f.text_area :content, placeholder: "Compose new comment..." %>
</div>
<%= f.submit "Post", class: "btn btn-primary" %>
<% end %>

还有我的cmets_controller.rb：

class CommentsController < ApplicationController

  before_action :logged_in_user, only: [:create, :destroy]

def create
  @comment = current_user.comments.build(comment_params)
  if @comment.save
    flash[:success] = "Comment created!"
    redirect_to request.referrer || root_url
  else
    render 'new'
  end
end

def new
  @comment = Comment.new
end

def destroy
  @comment.destroy
  flash[:success] = "Comment deleted"
  redirect_to request.referrer || root_url
end

private

  def comment_params
    params.require(:comment).permit(:content)
  end
end

顺便说一句：我知道在我的 form_for 中使用 Comment.new 是不习惯的——我也有这个问题，但我想一次解决一个问题（除非他们以某种方式参与）

Answer 1

我怀疑您的 config/routes.rb 文件中没有用于 cmets 的条目，即：

resources :comments