cache_count

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ruby 代码

#thingsuser.rb
class Thingsuser < ActiveRecord::Base
    belongs_to :user
    belongs_to :thing, :counter_cache => true
end

ruby 代码

#user.rb
  has_many :thingsusers
  has_many :things,:through=>:thingsusers,:dependent =>:destroy

ruby 代码

#thing.rb
  has_many :thingsusers
  has_many :users,  :through => :thingsusers

 

table.column:thingsusers_count