我正在尝试使用Rails 4制作应用程序。
我使用简单的表格形式。
我正在尝试遵循本教程,以便我的多态注释模型可用于向文章添加注释。 https://gorails.com/episodes/comments-with-polymorphic-associations?autoplay=1
我有文章和评论的模型如下:
article.rb
has_many :comments, as: :commentable
accepts_nested_attributes_for :comments
comment.rb
belongs_to :user
belongs_to :commentable, :polymorphic => true
评论控制器的设置如视频教程所示:
comments_controller.rb
文章/ comments_controller.rb
文章控制器有:
def new
@article = Article.new
@article.comments.build
end
def article_params
params[:article].permit(:user_id, :body, :title, :image, :tag_list,
comment_attributes: [:opinion])
end
文章展示页面有:
<div class="col-xs-12">
<%= render :partial => 'comments/form', locals: {commentable: @article} %>
</div>
评论部分包含:
<%= simple_form_for [commentable, Comment.new] do |f| %>
<%= f.error_notification %>
<div class="form-inputs">
<%= f.input :opinion, as: :text, :label => "Add your thoughts", :input_html => {:rows => 4} %>
</div>
<div class="form-actions">
<%= f.button :submit, "Submit", :class => 'formsubmit' %>
</div>
<% end %>
路线是:
resources :articles do
collection do
get 'search'
end
resources :comments, module: :articles
end
当我保存所有这些并尝试渲染文章显示页面时,我收到此错误:
#
的未定义方法`new'错误指向评论控制器创建操作:
def create
@comment = @commentable.new(comment_params)
@comment.user = current_user
respond_to do |format|
if @comment.save
format.html { redirect_to @commentable }
format.json { render :show, status: :created, location: @comment }
else
format.html { render :new }
format.json { render json: @comment.errors, status: :unprocessable_entity }
end
end
end
我不知道问题是什么。我无法理解为什么这不起作用或此错误消息的含义。我想知道它是否因为评论既属于用户又属于可评论。
事实上,当我推送它并试图在生产模式下看到它时,我收到失败并且heroku日志显示此错误:
Exiting
2016-01-02T02:27:59.274318+00:00 app[web.1]: /app/app/controllers/Articles/comments_controller.rb:1:in `<top (required)>': uninitialized constant Articles (NameError)
整篇文章/评论控制者有:
class Articles::CommentsController < CommentsController
before_action :set_commentable#, only: [:show, :edit, :update, :destroy]
private
# Use callbacks to share common setup or constraints between actions.
def set_commentable
@commentable = Article.find(params[:article_id])
end
end
所以这现在适用于新文章,但只有1条评论。如果我尝试在单篇文章中添加第二条评论,我会收到此错误:
PG::UniqueViolation: ERROR: duplicate key value violates unique constraint "index_comments_on_commentable_type_and_commentable_id" DETAIL: Key (commentable_type, commentable_id)=(Article, 4) already exists. : INSERT INTO "comments" ("opinion", "user_id", "commentable_id", "commentable_type", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id"
答案 0 :(得分:0)
尝试:
def create
@comment = Comment.new(comment_params)
@comment.user = current_user
@comment.commentable = @commentable
respond_to do |format|
if @comment.save
format.html { redirect_to @comment }
format.json { render :show, status: :created, location: @comment }
else
format.html { render :new }
format.json { render json: @comment.errors, status: :unprocessable_entity }
end
end
end
答案 1 :(得分:0)
很多问题。
这应该是它的样子:
-
destroy()
您应该将注释创建为自己的实体(而不是文章的嵌套属性)。您应该使用以下内容执行此操作:
#config/routes.rb
resources :articles do
get :search, on: :collection
resources :comments, module: :articles #-> url.com/articles/:article_id/comments
end
#app/controllers/articles/comments_controller.rb #-> this is the heroku error
class Articles::CommentsController < ApplicationController
before_action :set_article
respond_to :js, :json, :html
def create
@comment = @article.comments.new comment_params
respond_with @comment
end
private
# Use callbacks to share common setup or constraints between actions.
def set_article
@article = Article.find params[:article_id]
end
def comment_params
params.require(:comment).permit(:opinion).merge(user: current_user)
end
end
这应该会在#app/views/articles/show.html.erb
<%= content_tag :div, render(partial: 'comments/form', locals: { article: @article }), class: "col-xs-12" %>
#app/views/comments/_form.html.erb
<%= simple_form_for [article, article.comments.new] do |f| %>
<%= f.input :opinion, as: :text, label: "Add your thoughts", input_html: {rows: 4} %>
<%= f.submit %>
<% end %>
的背面创建一个独立的评论。