Question

我想按论坛帖子的数量按降序排列每个论坛。我的forum_posts_count表格已经有Forum列。

Forum.rb

class Forum < ActiveRecord::Base

 scope :popular, -> { order("forum_posts_count DESC") }
 has_many :forum_posts, through: :forum_threads

end

forums_controller.rb

ForumsController < ApplicationController
 def index
  @forums = Forum.all.popular
 end
end

forum_post.rb Class ForumPost＆lt;的ActiveRecord ::基

 has_one :forum, through: :forum_thread
 belongs_to :forum_thread, touch: true

  after_create :increment_forum_posts_count
  after_destroy :decrement_forum_posts_count

 private

  def increment_forum_posts_count       
    Forum.increment_counter( 'forum_posts_count', self.forum_thread.forum_id )
  end

  def decrement_forum_posts_count
    Forum.decrement_counter( 'forum_posts_count', self.forum_thread.forum_id )
  end

end

... add_counters_to_forums_table.rb（迁移）

class AddCountersToForumsTable < ActiveRecord::Migration

 def self.up
  change_table :forums do |t|
   t.integer :forum_threads_count, :forum_posts_count, default: 0
 end

 Forum.reset_column_information

 Forum.all.pluck(:id).each do |id|
  Forum.reset_counters(id, :forum_posts)
  Forum.reset_counters(id, :forum_threads)
 end
end

def self.down
 change_table :forums do |t|
  t.remove :forum_threads_count, :forum_posts_count
 end
end

end

我没有收到错误或任何错误，只是没有正确地订购论坛。这可能是缓存的问题吗？我已经重置了数据库，但它的订购仍然不正确。

Rails 4：范围在ActiveRecord中不起作用

0 个答案: