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在Rails 5中的文章中添加注释(深度嵌套资源)

ruby-on-rails

sofarsophie · 技术社区 · 7 年前

我有一个Rails应用程序,它有三个主要模型: Qn、Ans和评论 嵌套得很深 (注释嵌套较浅),它们都显示在 ,这让人非常困惑。

http://localhost:3000/questions/2 ,用户可以看到所有 @问题.答案 答案 ,用户可以看到 答案.评论 答复 ,用户也可以提交新评论。

undefined method `model_name' for {:url=>"/questions/4/answers/2/comments/new"}:Hash

所以我试着通过params @可评论的 答复 特定控制器和动作 等等,但这些方法都不起作用。我猜我的控制器有问题,但我似乎不知道是什么。

路线。rb(顶部)

# Resources
resources :sessions
resources :users
resources :bookmarks # to be implemented later

resources :questions do
  resources :answers do
    resources :comments, shallow: true
  end
end

class Question < ApplicationRecord    
  has_many :answers
  has_many :bookmarks #later
end

class Answer < ApplicationRecord
  belongs_to :question
  has_many :comments, as: :commentable

  has_many :likes, as: :likeable
  validates :answercontent, length: {minimum: 50}
end

class Comment < ApplicationRecord
  belongs_to :commentable, polymorphic: true
end

<% @question.answers.each do |answer| %>
// ommited
<!-- Comments -->
<% answer.comments.each do |comment| %>
   <%= comment.content %>
   <br>
<% end %>

<!-- Submit new comment -->
<%= form_for(url: new_question_answer_comment_path, comment: {answer_id: answer.id, question_id: @question.id}) do |f| %>
   <%= f.text_area :content %>
   <%= f.submit "Submit" %>
<% end %>
<% end %>

问题控制器(新建、创建、销毁,为简洁起见)

class QuestionsController < ApplicationController
def index
    @questions = Question.all
end

def show
    @question = Question.find(params[:id])
    @answers = Answer.all

    # Delete only appears when num_ans is 0
    @deletable = (current_user== User.find(@question.user_id)) && (@question.answers.all.size==0)

end

private
  def question_params
    params.require(:question).permit(:picture_url, :country, :educational_level, :topic)
  end

end

答案控制器(编辑、更新、销毁或简化)

class AnswersController < ApplicationController

def create
    @question = Question.find(params[:question_id])
    @answer = @question.answers.create(answer_params)
    @answer.question_id = @question.id
    @answer.user_id = current_user.id

    if @answer.save
        redirect_to @question
    else
        render :new
    end
end

private
  def answer_params
    params.require(:answer).permit(:user_id, :question_id, :answercontent)
  end    
end

class CommentsController < ApplicationController
before_filter: load_commentable

def index
  @commentable = Answer.find(params[:answer_id])
  @comments = @commentable.comments
end

def new
   @comment = @commentable.comments.new
end

def create
  @comment = @commentable.comments.new(params[:comment])
    if @comment.save
     redirect_to @commentable
  else
    render :new
  end
end

# From RailsCast ep.154
private
def load_commentable
  resource, id = request.path.split('/')[1,2]
  @commentable = resource.singularize.classify.constantize.find(id)
end   
end

路线

 question_answer_comments GET    /questions/:question_id/answers/:answer_id/comments(.:format)     comments#index
                        POST   /questions/:question_id/answers/:answer_id/comments(.:format)     comments#create
new_question_answer_comment GET    /questions/:question_id/answers/:answer_id/comments/new(.:format) comments#new
           edit_comment GET    /comments/:id/edit(.:format)                                      comments#edit
                comment GET    /comments/:id(.:format)                                           comments#show
                        PATCH  /comments/:id(.:format)                                           comments#update
                        PUT    /comments/:id(.:format)                                           comments#update
                        DELETE /comments/:id(.:format)                                           comments#destroy

提前感谢您的帮助。

为了向您提供有关我尝试的解决方案的更多信息:

<%= form_for([answer, @comment], url: new_question_answer_comment_path(answer.id, @question.id)) do |f| %>

给了我:

First argument in form cannot contain nil or be empty

使用@commentable(这基本上就是答案)会给我一个错误,即“id在@commentable中”。id不存在,因为@commentable为nil”。

所以我认为问题是或 @可评论的

1 回复 | 直到 7 年前

Pavan Cesar 7 年前

form_for 期望记录像 第一个参数 注释实例 ~~new_question_answer_comment_path 期望值 question_id 和 answer_id 钥匙~~ 创建新注释 路线应该是 question_answer_comments 不 new_question_answer_comment 所以你的应该是

<%= form_for Comment.new,url: question_answer_comments_path(@question,answer) do |f| %>
  <%= f.text_area :content %>
  <%= f.submit "Submit" %>
<% end %>

或者只是

<%= form_for [Comment.new,@question,answer] do |f| %>
  <%= f.text_area :content %>
  <%= f.submit "Submit" %>
<% end %>