Micropost的用户页面评论（Ruby on Rails）

问题描述

在用户的页面上有很多微博，我想为每个微博添加评论表单和评论。

我有三个模型：User，Micropost， / p>

user.rb

  < ActiveRecord :: Base 
 has_many：microposts，dependent：：destroy 
 has_many：comments 
 end 
  

micropost.rb

  class Micropost< ActiveRecord :: Base 
 belongs_to：user 
 has_many：comments，dependent：：destroy 
 end 
  

comment.rb

  ActiveRecord :: Base 
 attr_accessible：comment_content 
 
 belongs_to：user 
 belongs_to：micropost 
 
 validates：comment_content，presence：true 
 validates： user_id，presence：true 
 validates：micropost_id，presence：true 
 end 
  

comments_controller.rb

  class CommentsController< ApplicationController 
 
 def create 
 @comment = current_user.comments.build（params [：comment]）
如果@ comment.save 
 flash [：success] =评论已创建！ 
 redirect_to current_user 
 else 
 render'shared / _comment_form'
 end 
 end 
 end 
  

_micropost.html.erb

 < tr> 
< td class =micropost> 
< span class =content><％= wrap（micropost.content）％>< / span> 
< span class =timestamp> 
发布日期<％= time_ago_in_words（micropost.created_at）％>前。 
< / span> 
<％= render'shared / comment_form'％> 
< / td> 
< / tr> 
   

评论表

 <％= form_for（@comment）do | f | ％> 
<％= render'shared / error_messages'，object：f.object％> 
< div class =field> 
<％= f.text_area：comment_content％> 
< / div> 
< button class =btntype =submit> 
 Create 
< / button> 
<％end％> 
  

每个微博必须有自己的评论。
在我的数据库我有注释表与

列。

注释不会创建，因为RoR无法识别此新注释属于哪个微博。
我应该如何在我的DB中拥有所有需要的信息？

UPDATE

users_controller

  def show 
 @user = User.find params [：id]）
 @microposts = @ user.microposts.paginate（page：params [：page]）
 @comment = Comment.new 
 end 
  

microposts_controller

  def create 
 @micropost = current_user.microposts.build（params [：micropost]）
 if @ micropost.save 
 flash [：success] =Micropost created！ 
 redirect_to current_user 
 else 
 render'shared / _micropost_form'
 end 
 end 
  

解决方案!!!

感谢carlosramireziii和Jon！他们都是正确的

comments_controller

  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] =注释创建！ 
 redirect_to current_user 
 else 
 render'shared / _comment_form'
 end 
 end 
  

_micropost.html.erb

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

评论表

 <％= form_for（[micropost，@comment]）do | f | ％> 
  

routes.rb

 资源：microposts do 
资源：comments 
 end 
  

解决方案

尝试将当前微博传递给部分评论

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

然后将微博添加到注释 form_for

 <％= form_for（[micropost，@comment]）do | f | ％> 
 

确保您的路线已嵌套

 ＃in routes.rb 
 resources：microposts do 
 resources：comments 
 end 
  

然后在 CommentsController

中构建微博的注释

  def create 
 @micropost = Micropost.find（params [：micropost_id]）
 @comment = @ micropost.comments.build（params [：comment]） 
 ... 
 end 
  

On user's page i have many microposts and i want to add comment form and comments to each micropost.

I have three models: User, Micropost, Comment.

user.rb

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

micropost.rb

class Micropost < ActiveRecord::Base
  belongs_to :user
  has_many :comments, dependent: :destroy
end

comment.rb

class Comment < ActiveRecord::Base
  attr_accessible :comment_content

  belongs_to :user
  belongs_to :micropost

  validates :comment_content, presence: true
  validates :user_id, presence: true
  validates :micropost_id, presence: true  
end

comments_controller.rb

class CommentsController < ApplicationController

  def create
    @comment = current_user.comments.build(params[:comment])
    if @comment.save
       flash[:success] = "Comment created!"
       redirect_to current_user
    else
      render 'shared/_comment_form'
    end
  end
end

_micropost.html.erb

<tr>
  <td class="micropost">
    <span class="content"><%= wrap(micropost.content) %></span>
    <span class="timestamp">
      Posted <%= time_ago_in_words(micropost.created_at) %> ago.    
    </span>
    <%= render 'shared/comment_form' %>
   </td>
</tr>

Comment form

<%= form_for(@comment) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
  <div class="field">
    <%= f.text_area :comment_content %>
  </div>
  <button class="btn" type="submit">
    Create
  </button>
<% end %>

Every micropost must have its own comments.In my DB i have comment table with

columns.

Comment is not creating because RoR can't understand to which micropost belongs this new comment.What should i do to have all needed information in my DB?

UPDATE

users_controller

  def show
    @user = User.find(params[:id])
    @microposts = @user.microposts.paginate(page: params[:page])
    @comment = Comment.new
  end

microposts_controller

  def create
    @micropost = current_user.microposts.build(params[:micropost])
    if @micropost.save
      flash[:success] = "Micropost created!"
      redirect_to current_user
    else
      render 'shared/_micropost_form'
    end
  end

SOLUTION!!!

Big thanks to carlosramireziii and Jon! They are both right

comments_controller

  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

_micropost.html.erb

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

Comment form

<%= form_for([micropost, @comment]) do |f| %>

routes.rb

resources :microposts do
  resources :comments
end

解决方案

Try passing in the current micropost to the comment partial

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

Then add the micropost to the comment form_for call

<%= form_for([micropost, @comment]) do |f| %>

Make sure your routes are nested

# in routes.rb
resources :microposts do
  resources :comments
end

Then build the comment off of the micropost in the CommentsController

def create
  @micropost = Micropost.find(params[:micropost_id])
  @comment = @micropost.comments.build(params[:comment])
  ...
end

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