我需要获取用户浏览次数最多的 5 篇文章。为此,我实现了“印象”功能,并且文章和印象模型之间存在多态关系。使用此功能,我无法获得每篇文章从用户那里获得的 View 。但现在我需要从数据库中获取 5 篇浏览次数最多的文章。我知道这是一个愚蠢的问题,但我尝试过但找不到答案。
schema.rb(我没有粘贴完整的文件,只是相关的)
ActiveRecord::Schema.define(:version => 20130419101017) do
create_table "articles", :force => true do |t|
t.string "title"
t.text "body"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
t.integer "user_id"
end
create_table "comments", :force => true do |t|
t.text "content"
t.integer "user_id"
t.string "article_id"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
create_table "impressions", :force => true do |t|
t.string "impressionable_type"
t.integer "impressionable_id"
t.integer "user_id"
t.string "ip_address"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
文章_controller.rb
class ArticlesController < ApplicationController
before_filter :is_user_admin, only: [:new, :create, :edit, :destroy]
before_filter :log_impression, :only=> [:show]
def is_user_admin
redirect_to(action: :index) unless current_user.try(:is_admin?)
return false
end
def log_impression
@article = Article.find(params[:id])
# this assumes you have a current_user method in your authentication system
@article.impressions.create(ip_address: request.remote_ip,user_id:current_user.id)
end
def index
@articles = Article.all(:order => "created_at DESC")
@article_titles = Article.first(10)
@article_popular = Article.
@tags = Tag.all
end
def show
@article = Article.find(params[:id])
@related_articles = Article.joins(:taggings).
where('articles.id != ?', @article.id)
.where(taggings: { tag_id: @article.tag_ids })
end
def new
@article = Article.new
end
def create
@article = Article.new(params[:article])
@article.user_id = current_user.id
if @article.save
flash[:success] = "article created!"
redirect_to article_path(@article)
else
render 'new'
end
end
def destroy
@article = Article.find(params[:id])
@article.destroy
redirect_to action: 'index'
end
def edit
@article = Article.find(params[:id])
end
def update
@article = Article.find(params[:id])
if @article.update_attributes(params[:article])
flash.notice = "Article '#{@article.title}' Updated!"
redirect_to article_path(@article)
else
render 'edit'
end
end
end
文章.rb
class Article < ActiveRecord::Base
attr_accessible :title, :body
attr_accessible :tag_list
has_many :comments
belongs_to :user
has_many :taggings
has_many :tags, through: :taggings
has_many :impressions, :as=>:impressionable
validates :title, :body, :tag_list, :presence => true
def impression_count
impressions.size
end
def unique_impression_count
impressions.group(:ip_address).size #UNTESTED: might not be correct syntax
end
def tag_list
self.tags.collect do |tag|
tag.name
end.join(", ")
end
def tag_list=(tags_string)
tag_names = tags_string.split(",").collect{|s| s.strip.downcase}.uniq
new_or_found_tags = tag_names.collect { |name| Tag.find_or_create_by_name(name) }
self.tags = new_or_found_tags
end
end
印象.rb
class Impression < ActiveRecord::Base
attr_accessible :impressionable_id, :impressionable_type, :ip_address, :user_id
belongs_to :impressionable, :polymorphic=>true
end
文章/show.html.erb
Viewed: <%<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="d3ee93b2a1a7bab0bfb6fdbabea3a1b6a0a0babcbd" rel="noreferrer noopener nofollow">[email protected]</a>_count %> times
这就是我计算用户浏览量的方法。现在我想获取用户浏览次数最多的 5 篇文章。 任何帮助将不胜感激。有关更多信息,我使用 ( simple hit counter for page views in rails ) 这个来获取用户 View 。
最佳答案
我认为避免映射 ruby 对象的最佳方法是使用 counter cache :
# add the impression count column to your tables
t.integer :articles, :impressions_count
t.integer :comments, :impressions_count
在您的模型中:
class Article < AR
has_many :impressions, as: :impressionable
has_many :comments
end
class Comment < AR
belongs_to :article
has_many :impressions, as: :impressionable
end
class Impression < AR
# the counter cache here is the important option
belongs_to :impressionable, polymorphic: true, counter_cache: :impressions_count
end
通过此设置,每次创建展示时,相应模型中的 impressions_count
列都会更新。因此,您可以简单地对展示次数进行排序,以获得前 5 个最高的展示次数:
Article.order('articles.impressions_count DESC').limit(5)
分别
Comment.order('comments.impressions_count DESC').limit(5)
当然你也可以这样做@article.impressions_count
...
关于ruby-on-rails - 如何在 ruby on Rails 中获取 5 篇浏览次数最多的文章,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16130092/