1

@post.comments.all 很清楚。我发送表格后没有看到任何错误。当我点击“提交”时，我发送到帖子/id/comments，但是

我的路线.rb

resources :posts do
    resources :comments
end

后控制器

  def show
    @current_user ||= User.find(session[:user_id]) if session[:user_id]
    @commenter = @current_user
    @post = Post.find(params[:id])
    @comment = Comment.build_from( @post, @commenter.id, "234234" )
    @comments = Comment.all
    respond_to do |format|
      format.html
      format.json { render json: @post }
    end
  end

评论控制器

class CommentsController < ApplicationController

  def index
    @comments = @post.comments.all
  end

  def create
    @post = Post.find(params[:post_id])
    @comment = @post.comments.new params[:comment]
    if @comment.save
      redirect_to @post # comment not save, so i dont redirect to this page
    else
      # is that there
    end
  end

end

后模型

  acts_as_commentable
  has_many :comments

评论模型

class Comment < ActiveRecord::Base
  acts_as_nested_set :scope => [:commentable_id, :commentable_type]
  attr_accessible :commentable, :body, :user_id
  validates :body, :presence => true
  validates :user, :presence => true

  # NOTE: install the acts_as_votable plugin if you
  # want user to vote on the quality of comments.
  #acts_as_votable

  belongs_to :commentable, :polymorphic => true

  # NOTE: Comments belong to a user
  belongs_to :user

  # Helper class method that allows you to build a comment
  # by passing a commentable object, a user_id, and comment text
  # example in readme
  def self.build_from(obj, user_id, comment)

    new \
      :commentable => obj,
      :body        => comment,
      :user_id     => user_id
  end

  #helper method to check if a comment has children
  def has_children?
    self.children.any?
  end

  # Helper class method to lookup all comments assigned
  # to all commentable types for a given user.
  scope :find_comments_by_user, lambda { |user|
    where(:user_id => user.id).order('created_at DESC')
  }

  # Helper class method to look up all comments for
  # commentable class name and commentable id.
  scope :find_comments_for_commentable, lambda { |commentable_str, commentable_id|
    where(:commentable_type => commentable_str.to_s, :commentable_id => commentable_id).order('created_at DESC')
  }

  # Helper class method to look up a commentable object
  # given the commentable class name and id
  def self.find_commentable(commentable_str, commentable_id)
    commentable_str.constantize.find(commentable_id)
  end
end

发布视图

%h2 Add a comment:
- @comments.each do |c|
  = @c.body
= form_for([@post, @comment]) do |f|

  .field
    = f.label :body
    %br/
    = f.text_area :body
  .actions
    = f.submit

在此先感谢，抱歉英语不好

4

1 回答 1

4

首先，您可以@comment.save自己调试为什么返回 false - 只需添加p @comment.errorselse 块并检查服务器日志。

在我看来，您尝试保存无效评论是因为您没有 setup userfor @commentin action CommentsController#create。评论验证用户的存在！

有几种方法可以解决它。分析您的代码我认为对您来说最简单的方法是修改CommentsController#create

#CommentsController
def create
  @current_user ||= User.find(session[:user_id]) if session[:user_id]
  @post = Post.find(params[:post_id])
  @comment = @post.comments.new params[:comment]
  @comment.user = @current_user
  if @comment.save
    redirect_to @post # comment not save, so i dont redirect to this page
  else
    # is that there
  end
end

另一种方法是使用一些 gem 进行身份验证 - 我建议设计

另一种方法（非常糟糕的方法）是通过隐藏字段传递 user_id（您已在 Comment 中的 attr_accessible 列表中定义@current_user和PostsController#showuser_id）。但这是破解您的应用程序并代表系统中的任何用户撰写评论的简单方法！

于 2013-09-16T18:40:24.317 回答