如何确保主页中显示的帖子供稿中的每个帖子的所有注释都显示在其下？

问题描述

我有一个Post模型和一个属于Post的Comment模型。我能够显示对应于家庭控制器和家庭行动和用户/显示视图的主视图中的帖子。因此，在家庭和用户视图中，帖子按照创建时间的顺序列出。我也能够在用户和家庭的意见，并在家庭和用户的意见的评论表格。

当我尝试显示家庭和用户视图中显示的每个帖子下的评论。如何在家庭和用户视图中列出与帖子下的每个帖子关联的评论？

如何确保数据库中的评论列在相应的发布？

这是我的评论控制器：

  class CommentsController< ApplicationController 
 def index 
 @comments = Comment.all.paginate（page：params [：page]）
 end 
 def show 
 @comment = Comment.find（ params [：id]）
 @post = @ Comment.post 
 end 
 def new 
 end 
 def create 
 @comment = Comment.new 
 if @ comment.save 
 flash [：success] =创建的注释
 redirect_to：back 
 else 
渲染'new'
 end 
 end 
 def edit 
 @comment = Comment.find（params [：id]）
 end 
 def update 
 @comment = comment.find（ params [：id]）
 if @ comment.update_attributes（comment_params）
 flash [：success] =评论更新
 redirect_to @ comment.post 
 else 
渲染'编辑'
结束
结束
 def破坏
 Comment.find（params [：id]）。destroy 
 flash [：success] =Comment deleted 
 redirect_to users_url 
 end 
 private 
 def comment_params 
 params.require（：comment）.permit（：author_姓名，：身体）
结束
结束
  

这是我的主页视图： app / views / home / home.html.erb：

 <％如果被记录下来？ ％GT; 
< div class =row> 
< aside class =col-md-4> 
< section class =user_info> 
<％=呈现'shared / user_info'％> 
< / section> 
< hr /> 
< br /> 
< section class =stats> 
 < / section> 
< section class =post_form> 
<％=呈现'shared / post_form'％> 
< / section> 
< / aside> 
< div class =col-md-8> 
< h3>后期提要< / h3> 
 < / div> 
< / div> 
<％else％> 
< div class =center jumbotron> 
< h1>欢迎来到Unstarv网站< / h1> 
< h2> 
请立即注册以使用此网站
 现在。 
< / h2> 
 < / div> 
 <％end％> 
  

以下是我的家用控制器：

  class HomeController< ApplicationController 
 def home 
如果logged_in？ 
 @post = current_user.posts.build 
 @feed_items = current_user.feed.paginate（page：params [：page]）
 end 
 end 
 
 def about 
 end 
 
 def privacy 
 end 
 
 def terms 
 end 
 end 
  

这里是我的Post模型，相关部分：

pre > class Post< ActiveRecord :: Base
belongs_to：user
has_many：comments
default_scope - > {order（created_at：desc）}
mount_uploader：picture，PictureUploader
end


  class User< ActiveRecord :: Base 
 attr_accessor：remember_token 
 before_save {self.email = email.downcase} 
 has_many：posts，dependent：：destroy 
 has_many：comments $ b $ has_many： active_relationships，class_name：Relationship，
 foreign_key：follower_id，
 dependent：：destroy 
 has_many：passive_relationships，class_name：Relationship，
 foreign_key：followed_id， 
依赖：：destroy 
 has_many：跟随，通过：：active_relationships，source：：跟随
 has_many：followers，通过:: passive_relationships，source :: follower 
 validates：username， presence：true，length：{maximum：50} 
 VALID_EMAIL_REGEX = /\A[\w+\-.]+@[az\d\-.]+\.[az]+ \ z / i 
验证：email，presence：true，格式：{with：VALID_EMAIL_REGEX}，
唯一性：{case_sensitive：false} 
 has_secure_password 
 validates：password，length ：{minimum：6}，allow_blank：true 
 
 def feed 
 following_ids =SELECT followed_id FROM relationship WHERE follower_id =：user_id
 Post.where（user_id IN（＃{following_ids}）or user_id =：user_id， user_id：id）
 end 
 end 
  

这里是我的评论模式：

  class评论< ActiveRecord :: Base 
 belongs_to：post 
 belongs_to：user 
 default_scope  - > {order（created_at：：desc）} 
 end 
  

这里是后控制器：

  class PostsController< ApplicationController 
 before_action：logged_in_user，只有：[：create，：destroy] 
 def index 
 @posts = Post.all 
 end 
 def show 
 @ post = Post.find（params [：id]）
 @comment = Comment.new 
 @ comment.post_id = @ post.id 
 @comments = @ post.comments.all 
 end 
 def new 
 @post = Post.new 
 end 
 def create 
 @post = current_user.posts.build（post_params）
 if @ post.save 
 flash [：success] =创建后！ 
 redirect_to root_url 
 else 
 @feed_items = [] 
 render'home / home'
 end 
 end 
 def edit 
 @post = Post.find（params [：id]）
 end 
 def update 
 @post = Post.find（params [：id]）
 @ post.update post_params）
 flash.notice =发布#{@post.title}'已更新！ 
 render'home / home'
 end 
 
 def update 
 @post = Post.find（params [：id]）
 @ post.update （post_params）
 flash.notice =发布#{@post.title}'已更新！ 
 redirect_to root_url 
结束
 
私有
＃使用回调共享设置或操作之间的约束。 
 def set_post 
 @post = Post.find（params [：id]）
 end 
 
＃不要信任吓人的互联网参数，只允许白名单通过。 
 def post_params 
 params.require（：post）.permit（：title，：body，：picture）
 end 
 end 
  

这是我的app / views / post / _post.html.erb文件，

 < li id =post-<％= post.id％>> 
< span class =user><％= link_to post.user.username，post.user％>< / span> 
< span class =content> 
<％= post.title％> 
<％= post.body％> 
 < / span> 
< span class =timestamp> 
已发布<％= time_ago_in_words（post.created_at）％>前。 
   data：{confirm：你确定？ }％> 
<％end％> 
< / span> 
< section> 
< h2>您的评论在这里< / h2> 
< h3>发表评论< / h3> 
< h3>发表评论< / h3> 
<％=呈现'shared / comment_form'％> 
 < h4>< small>评论< / small> <％= comment.post.user.username％>< / h4> 
< p class =comment><％= comment.body％>< / p> 
< p>< small>发布<％= distance_of_time_in_words（Time.now，comment.created_at）％>前及LT; /小>< / p为H. 
< br /> 
<％end％> 
< / li> 
  

这里是我的app / views / shared / comment_form_html.erb，它工作正常：

 <％= form_for [post，post.comments.build] do | f | ％GT; 
< p> 
<％= f.label：body，Your Comment％>< br /> 
<％= f.text_area：body％> 
< / p> 
< p> 
 < / p> 
<％end％> 
  

这是我的app / views / posts / _post.html.erb

 < li id =post-<％= post.id％>> 
< span class =user><％= link_to post.user.username，post.user％>< / span> 
< span class =content> 
<％= post.title％> 
<％= post.body％> 
 < / span> 
< span class =timestamp> 
已发布<％= time_ago_in_words（post.created_at）％>前。 
   data：{confirm：你确定？ }％> 
<％end％> 
< / span> 
< h2>评论< / h2> 
< h3>发表评论< / h3> 
<％=渲染'shared / comment_form'，post：post％> 
< h3>评论（<％= post.comments.size％>）< / h3> 
 < h4>< small>评论< / small> <％= comment.post.user.username％>< / h4> 
< p class =comment><％= comment.body％>< / p> 
< p>发布<％= distance_of_time_in_words（Time.now，comment.created_at）％>前及LT; / p为H. 
< / li> 
< br /> 
<％end％> 
  

非常感谢您的帮助!!!!

解决方案

这个问题与您如何创建注释有关。

使用实际的代码，注释不会属于任何职位，所以在您的 comments_controller 更改创建行动到类似：

  def create 
 post = Post.find（params [：post_id]）
 @comment = post.comments.build（comment_params）
 if @ comment.save 
 flash [：success] =创建的评论
 redirect_to：back 
 else 
 render'new'
 end 
结束
  

I have a Post model, and a Comment model that belongs to Post. I was able to display the Post in the home view corresponding to the home controller and home action and the User/show view. Thus, in the home and user views, the posts are listed in order of creation time. I was also able to have a post form in both the user and home views and a comment form in the home and user views.

The problem arises when I try to display the comment underneath each displayed Post in the home and user views. How can I list the comments associate with each post under the post in the home and user views ?

How do I make sure the comments in the databased are listed under the corresponding post ?

Here is my comments controller:

class CommentsController < ApplicationController
 def index
 @comments =Comment.all.paginate(page: params[:page])
  end
 def show
 @comment = Comment.find(params[:id])
 @post = @Comment.post
 end
 def new
 end
 def create
 @comment = Comment.new(comment_params)
  if @comment.save
  flash[:success] = "Comment created"
  redirect_to :back
  else
  render 'new'
  end
  end
  def edit
  @comment = Comment.find(params[:id])
  end
  def update
  @comment = comment.find(params[:id])
  if @comment.update_attributes(comment_params)
  flash[:success] = "Comment updated"
  redirect_to @comment.post
  else
  render 'edit'
  end
  end
  def destroy
    Comment.find(params[:id]).destroy
    flash[:success] = "Comment deleted"
    redirect_to users_url
  end
  private
  def comment_params
  params.require(:comment).permit(:author_name, :body)
  end
  end

Here is my home view: app/views/home/home.html.erb:

<% if logged_in? %>
  <div class="row">
    <aside class="col-md-4">
    <section class="user_info">
      <%= render 'shared/user_info' %>
    </section>
    <hr/>
    <br/>
    <section class="stats">
      <%= render 'shared/stats' %>
    </section>
    <section class="post_form">
      <%= render 'shared/post_form' %>
      </section>
    </aside>
    <div class="col-md-8">
      <h3>Post Feed</h3>
      <%= render 'shared/feed' %>
    </div>
  </div>
<% else %>
  <div class="center jumbotron">
    <h1>Welcome to the Unstarv website</h1>
    <h2>
      Please sign up now to use this site
      <%= link_to "Sign Up",  signup_path =%>
      now.
    </h2>
    <%= link_to "Sign up now!", signup_path, class: "btn btn-lg btn-primary" %>
  </div>
  <%= link_to image_tag("rails.png", alt: "unstarv logo"), '#' %>
<% end %>

And here is my home controller:

class HomeController < ApplicationController
  def home
    if logged_in?
      @post  = current_user.posts.build
      @feed_items = current_user.feed.paginate(page: params[:page])
    end
  end

  def about
  end

  def privacy
  end

  def terms
  end
end

And here is my Post model, the relevant part:

class Post < ActiveRecord::Base
  belongs_to :user
  has_many :comments
  default_scope -> { order(created_at: :desc) }
  mount_uploader :picture, PictureUploader
end

The relevant part of my User model:

class User < ActiveRecord::Base
  attr_accessor :remember_token
  before_save { self.email = email.downcase }
  has_many :posts, dependent: :destroy
  has_many :comments
  has_many :active_relationships, class_name:  "Relationship",
    foreign_key: "follower_id",
    dependent:   :destroy
  has_many :passive_relationships, class_name:  "Relationship",
    foreign_key: "followed_id",
    dependent:   :destroy
  has_many :following, through: :active_relationships, source: :followed
  has_many :followers, through: :passive_relationships, source: :follower
  validates :username,  presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence: true, format: { with: VALID_EMAIL_REGEX },
    uniqueness: { case_sensitive: false }
  has_secure_password
  validates :password, length: { minimum: 6 }, allow_blank: true

  def feed
    following_ids = "SELECT followed_id FROM relationships WHERE  follower_id = :user_id"
    Post.where("user_id IN (#{following_ids}) OR user_id = :user_id", user_id: id)
  end
end

And here is my Comment model:

class Comment < ActiveRecord::Base
  belongs_to :post
  belongs_to :user
  default_scope -> { order(created_at: :desc) }
end

And here is the post controller:

class PostsController < ApplicationController
  before_action :logged_in_user, only: [:create, :destroy]
  def index
    @posts = Post.all
  end
  def show
    @post = Post.find(params[:id])
    @comment = Comment.new
    @comment.post_id = @post.id
    @comments = @post.comments.all
  end
  def new
    @post = Post.new
  end
  def create
    @post = current_user.posts.build(post_params)
    if @post.save
      flash[:success] = "Post created!"
      redirect_to root_url
    else
      @feed_items = []
      render 'home/home'
    end
  end
  def edit
    @post = Post.find(params[:id])
  end
  def update
    @post = Post.find(params[:id])
    @post.update(post_params)
    flash.notice = "Post '#{@post.title}' Updated!"
    render 'home/home  '
  end

  def update
    @post = Post.find(params[:id])
    @post.update(post_params)
    flash.notice = "Post '#{@post.title}' Updated!"
    redirect_to root_url
  end

  private
  # Use callbacks to share common setup or constraints between actions.
  def set_post
    @post = Post.find(params[:id])
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def post_params
    params.require(:post).permit(:title, :body, :picture)
  end
end

Here is my app/views/post/_post.html.erb file,

<li id="post-<%= post.id %>">
  <span class="user"><%= link_to post.user.username, post.user %></span>
  <span class="content">
    <%= post.title %>
    <%= post.body %>
    <%= image_tag post.picture.url if post.picture? %>
  </span>
  <span class="timestamp">
    Posted <%= time_ago_in_words(post.created_at) %> ago.
    <% if current_user?(post.user) %>
    <%= link_to "delete", post, method: :delete,
        data: { confirm: "You sure?" } %>
        <% end %>
  </span>
  <section>
    <h2>Your Comments here</h2>
    <h3>Post a Comment</h3>
    <h3>Post a Comment</h3>
    <%= render 'shared/comment_form' %>
    <% post.comments.all.each do |comment| %>
    <h4><small>Comment by</small> <%= comment.post.user.username %></h4>
    <p class="comment"><%= comment.body %></p>
    <p><small>Posted <%= distance_of_time_in_words(Time.now,     comment.created_at) %> ago</small></p>
    <br/>
    <%end%>
</li>

And here is my app/views/shared/comment_form_html.erb , which works fine:

<%= form_for [ post, post.comments.build] do |f| %>
  <p>
    <%= f.label :body, "Your Comment" %><br/>
    <%= f.text_area :body %>
  </p>
  <p>
    <%= f.submit 'Submit' .  method="post", class: 'btn btn-primary' %>
  </p>
<% end %>

Here is my app/views/posts/_post.html.erb

<li id="post-<%= post.id %>">
<span class="user"><%= link_to post.user.username, post.user %></span>
<span class="content">
<%= post.title %>
<%= post.body %>
<%= image_tag post.picture.url if post.picture? %>
</span>
<span class="timestamp">
Posted <%= time_ago_in_words(post.created_at) %> ago.
<% if current_user?(post.user) %>
 <%= link_to "delete", post, method: :delete,
                                   data: { confirm: "You sure?" } %>
<% end %>
</span>
<h2>Comments</h2>
<h3>Post a Comment</h3>
<%= render 'shared/comment_form', post: post %>
<h3>Comments (<%= post.comments.size %>)</h3>
<% post.comments.each do |comment| %>
<h4><small>Comment by</small> <%= comment.post.user.username %></h4>
<p class="comment"><%= comment.body %></p>
<p>Posted <%= distance_of_time_in_words(Time.now, comment.created_at) %> ago</p>
</li>
<br/>
<%end%>

Thanks a lot for your help !!!!

解决方案

The issue is related in how you are creating the comments.

With the actual code, the comment does not belong to any post so in your comments_controller change create action to something like:

def create
  post = Post.find(params[:post_id])
  @comment = post.comments.build(comment_params)
  if @comment.save
    flash[:success] = "Comment created"
    redirect_to :back
  else
    render 'new'
  end
end

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