如何确保主页中显示的 Post 提要中的每个 post 的所有评论都显示在其下方？
How do I make sure each post in the Post feed shown in the home page has all its comments displayed under it?
我有一个 Post 模型，和一个属于 Post 的 Comment 模型。我能够在与家庭控制器和家庭操作以及 User/show 视图相对应的家庭视图中显示 Post。因此，在主页和用户视图中，post 是按创建时间顺序列出的。我还能够在用户和主页视图中都有一个 post 表单，在主页和用户视图中都有一个评论表单。
当我尝试在主视图和用户视图中的每个 Post 下方显示评论时出现问题。如何在主页和用户视图中的 post 下列出与每个 post 关联的评论？
如何确保数据库中的评论列在相应的 post 下？
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(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
这是我的主视图：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 %>
这是我的家庭控制器：
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
这是我的 Post 模型，相关部分：
class Post < ActiveRecord::Base
belongs_to :user
has_many :comments
default_scope -> { order(created_at: :desc) }
mount_uploader :picture, PictureUploader
end
我的用户模型的相关部分：
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
这是我的评论模型：
class Comment < ActiveRecord::Base
belongs_to :post
belongs_to :user
default_scope -> { order(created_at: :desc) }
end
这里是 post 控制器：
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
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 %>
<%= 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>
这是我的 app/views/shared/comment_form_html.erb ，效果很好：
<%= 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 %>
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 %>
<%= 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%>
非常感谢您的帮助!!!!
问题与您创建评论的方式有关。
在实际代码中，注释不属于任何 post，因此在您的 comments_controller 中将 create 操作更改为：
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
我有一个 Post 模型，和一个属于 Post 的 Comment 模型。我能够在与家庭控制器和家庭操作以及 User/show 视图相对应的家庭视图中显示 Post。因此，在主页和用户视图中，post 是按创建时间顺序列出的。我还能够在用户和主页视图中都有一个 post 表单，在主页和用户视图中都有一个评论表单。
当我尝试在主视图和用户视图中的每个 Post 下方显示评论时出现问题。如何在主页和用户视图中的 post 下列出与每个 post 关联的评论？
如何确保数据库中的评论列在相应的 post 下？
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(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
这是我的主视图：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 %>
这是我的家庭控制器：
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
这是我的 Post 模型，相关部分：
class Post < ActiveRecord::Base
belongs_to :user
has_many :comments
default_scope -> { order(created_at: :desc) }
mount_uploader :picture, PictureUploader
end
我的用户模型的相关部分：
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
这是我的评论模型：
class Comment < ActiveRecord::Base
belongs_to :post
belongs_to :user
default_scope -> { order(created_at: :desc) }
end
这里是 post 控制器：
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
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 %>
<%= 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>
这是我的 app/views/shared/comment_form_html.erb ，效果很好：
<%= 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 %>
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 %>
<%= 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%>
非常感谢您的帮助!!!!
问题与您创建评论的方式有关。
在实际代码中，注释不属于任何 post，因此在您的 comments_controller 中将 create 操作更改为：
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