计算过去7天内创建的记录

Question

如何更改下面的查询以仅选择在过去7天内创建的记录？

self.favorites.count

此功能位于我的User模型中.

 def calculate_user_score
    unless self.new_record?
      self.score = (self.links.count * 5) + (self.favorites.count * 0.5)
    end
  end  

Answer 1

你可以where像这样添加一个条件:

self.favorites.where('created_at >= ?', 1.week.ago).count

对于您的calculate_user_score方法,您可能也希望这样做links:

def calculate_user_score
  unless new_record?
    self.score = (links.where('created_at >= ?', 1.week.ago).count * 5) +
      (favorites.where('created_at >= ?', 1.week.ago).count * 0.5)
  end
end  

Answer 2

我建议你为你的模型添加一个范围:

class User < ActiveRecord::Base

  scope :recents, where("created_at > ?", Time.now-7.days)

end

那你可以做

self.favorites.recents.count

Answer 3

在Rails 4+中

此代码似乎不起作用:

"created_at > ?", Time.now-7.days

我尝试过:

scope :recent, -> { where("DATE(created_at) > ?", (Date.today).to_time - 7.days) }