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我目前有 3 个模型，UserModel (Devise)，一个 ArticleModel 和一个 CommentModel。

我和mongoid一起工作。

class Comment
  include Mongoid::Document
  field :body, type: String
  field :created_at, type: Time, default: DateTime.now
  belongs_to :article
  belongs_to :user
end

class Article
  include Mongoid::Document
  field :title, type: String
  field :body, type: String
  field :created_at, type: DateTime, default: DateTime.now
  has_many :comments
  belongs_to :user
end

class User
  include Mongoid::Document
  has_many :articles
  has_many :comments
end

我的文章/show.html.haml

.comments-form
        .row
    .span12
        = form_for([@article, @article.comments.build]) do |f|
            = f.text_area :body, :class => "span12", :rows => "3", :placeholder => "Your comment here..."
            = f.submit nil, :class => "btn"
.comments
    - @article.comments.each do |comment|
        .comment{:id => "#{comment.id}"}
            .row
                .span2
                    = image_tag("260x180.gif", :class => "thumbnail")
                .span10
                    = comment.body

我的comments_controller

class CommentsController < ApplicationController
  def new
    @article = Article.find(params[:article_id])
    @comment = @article.comments.create(params[:comment])
    @comment.user = current_user
    @comment.save
    redirect_to article_path(@article, notice: "Comment posted.")
  end
end

现在在我的文章/节目中出现了一个带有 id 但完全为空的评论，我只是无法弄清楚这个对象来自哪里......

4

1 回答 1

1

您的问题出在这一行：

= form_for([@article, @article.comments.build]) do |f|

当您调用 时@article.comments.build，您正在构建一个新评论并将其添加到@article.comments. 当您迭代您的评论时，您会看到您刚刚创建的空评论。

而不是[@article, @article.comments.build]，使用[@article, Comment.new].

于 2012-09-13T15:15:51.233 回答