Question

我有群组展示页面应该是帖子及其相应的评论。我的模特是：

class Group < ActiveRecord::Base
belongs_to :user
has_many :posts

class Post < ActiveRecord::Base
belongs_to :group
belongs_to :user
has_many :comments

class Comment < ActiveRecord::Base
belongs_to :user
belongs_to :post

在我的视图中，我在组/节目页面上显示所有内容，因此我只使用创建和销毁帖子和评论的路线：

resources :groups
resources :posts, only: [:create, :destroy] do
 resources :comments, only: [:create, :destroy]
end

我的控制器看起来像：

class GroupsController < ApplicationController
def show
 @group = Group.find(params[:id])
 @posts = @group.posts.paginate(page: params[:page])
 @post = current_user.posts.build if user_signed_in?
 @comment = current_user.comments.build if user_signed_in?
end

class PostsController < ApplicationController
def create
 @post = current_user.posts.build(post_params)
 @group = Group.find(params[:group_id])
 if @post.save
   @group.posts << @post
   flash[:success] = "Post created!"
   redirect_to group_path(@group)
 else
   @posts = @group.posts.paginate(page: params[:page])
   @users = @group.users
   render 'groups/show'
 end
end

class CommentsController < ApplicationController
def create
 @comment = current_user.comments.build(comment_params)
 @post = Post.find(params[:post_id])
 @group = Group.find(params[:group_id])
 if @comment.save
  @post.comments << @comment
  flash[:success] = "comment created!"
  redirect_to group_path(@group)
 else
  @posts = @group.posts.paginate(page: params[:page])
  @users = @group.users
  render 'groups/show'
 end
end

在小组/节目页面上我想要小组描述和帖子列表及其评论。没有评论一切正常。但是在创建评论时，我无法处理如何识别其相应帖子的post_id，我希望在其中创建这样的评论。我的评论表格如下：

<%= simple_form_for @comment, uri: post_comments_path do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<%= hidden_field_tag :post_id, @post.id %>
 <%= f.input :content,label: false, placeholder: "add comment", error: false %>
 <%= f.button :submit, "Comment", class: 'btn-primary' %>
<% end %>

唯一可访问的ID是group_id，因为我使用它的显示页面，但是如何到达post_id？

Answer 1

终于找到了解决方案。在拆解到部件后，我发现post_id在那里，但实际上group_id丢失了。问题在于创建注释时post_id和group_id都是必要的，但由于注释是嵌套的，我无法访问group_id。解决方案非常简单：

class CommentsController < ApplicationController
 def create
  @comment = current_user.comments.build(comment_params)
  @post = Post.find(params[:post_id])
  @group = @post.group

如何在嵌套注释中找到缺少的必需键：[：post_id]？

1 个答案: