Question

成功完成微博系统后。登录用户可以通过表单发布并创建帖子。我开始添加这个，但允许任何用户也对帖子发表评论。

我遇到了很多错误。在大多数情况下，我不知道问题是什么，所以有人建议如何完成这个。现在错误是：

StaticPages #home中的NameError 未定义的局部变量或方法`micropost'

StaticPages #home是显示每个人微博的页面，因此也会形成评论。用户#show是用户的公开个人资料，显示与statispages相同（尚未确定如何向用户墙发帖），最终主页将是一般提要，用户页面将是用户对用户提要）。

评论模型

  create_table "comments", force: true do |t|
    t.string   "content"
    t.integer  "user_id"
    t.integer  "micropost_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

User.rb

  class User < ActiveRecord::Base
    has_many :microposts, dependent: :destroy
    has_many :comments

micropost.rb

  belongs_to :user
  has_many :comments, dependent: :destroy

comment.rb

  belongs_to :user
  belongs_to :micropost

comments_controller.rb

class CommentsController < ApplicationController
  before_filter :signed_in_user, only: [:create, :destroy]

  def create
    @micropost = Micropost.find(params[:micropost_id])
    @comment = Comment.new(params[:comment])
    @comment.micropost = @micropost
    @comment.user = current_user
    if @comment.save
       flash[:success] = "Comment created!"
       redirect_to current_user
    else
      render 'shared/_comment_form'
    end
  end
end

microposts_controller.rb

class MicropostsController < ApplicationController
  before_action :authenticate_user!
  before_action :correct_user,   only: :destroy

  def index
    @microposts = Micropost.all
    @comment = @micropost.comments.build(params[:comment])
    @comment.user = current_user
  end

  def create
    @micropost = current_user.microposts.build(micropost_params)
    if @micropost.save
      flash[:success] = "Micropost created!"
      redirect_to root_url
    else
      @feed_items = []
      render root_url
    end
  end

  def destroy
    @micropost.destroy
    redirect_to root_url
  end

  private

    def micropost_params
      params.require(:micropost).permit(:content)
    end

    def correct_user
      @micropost = current_user.microposts.find_by(id: params[:id])
      redirect_to root_url if @micropost.nil?
    end
end

users_controller.rb

  def show
    @user = User.find(params[:id])
    @microposts = @user.microposts
    @comment = Comment.new
    if user_signed_in?
      @micropost  = current_user.microposts.build
      @feed_items = current_user.feed
    end
    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @user }
    end
  end

任何地方都在调用评论表单

<%= render 'shared/comment_form', micropost: micropost %>

_comment_form.html.erb

<%= form_for([micropost, @comment]) do |f| %> #Here's the current error#
<%= render 'shared/error_messages', object: f.object %>
  <div class="field">
    <%= f.text_area :content, :placeholder => "Leave a comment" %>
  </div>
  <button class="btn" type="submit">
    Create
  </button>
<% end %>

架构显示模型的所有正确字段。所有数据库迁移都已完成。我已经看到它在form_for（[micropost，@ comment]）中说第一个字段不能为零。我假设这意味着评论没有正确地填充micropost_id与他们附加的微博的id。

Rails 4中微博的评论

0 个答案: