查询 has_many 到 rails

Question

协会是

class Campaign
  has_many :views_logs
  has_many :users, through: :views_logs
end

我想在任何特定日期内获取 Campaign 中的所有 users 等等意思是，我想做类似的事情： Campaign.first.users.where(?)

现在，当我查询时：

Campaign.first.users.all

我获得了某个活动中所有用户的列表，但我如何才能只获得那些在特定日期范围内拥有活动的用户。

Answer 1

你试过吗：

Campaign.first.users.where("campaigns.created_at > #{start_date} AND campaigns.created_at < #{end_date}")

Answer 2

只需在 User 中定义一个范围，如下所示：

class User < ActiveRecord::Base
  # Your current code
  scope :during_campaign, -> (start, end) { 
       joins(view_logs: :campaign).where('campaigns.created_at >= ? AND campaigns.created_at <= ?', start, end)
  }

end

然后使用它：

# User from yesterday compaign for eg
User.during_campaign(1.day.ago, Time.now)

使其通用且始终漂亮！

Answer 3

I want to get all users in a Campaign within any specific dates

ActiveRecord Association Extension:

#app/models/campaign.rb
class Campaign < ActiveRecord::Base
   has_many :users, through: :view_logs do
      def between start_date, end_date
         where(created_at: start_date..end_date)
      end
   end
end

@campaign = Campaign.find x
@users    = @campaign.users.between(Date.today - 2, Date.today.day)

--

更新 - PGSQL 似乎需要 timestamp 来评估日期：

@users = @campaign.users.between(Time.now.midnight - 2.days, Time.now.midnight)

区别在于 Date & Time 个对象。

查询 has_many 到 rails

Query for has_many through rails

activerecord

ruby-on-rails

associations