Looking for a simple method utilizing active record to grab data from two models, combine the data, and then sort the combined output by created_at.
寻找一种使用活动记录从两个模型获取数据的简单方法，结合数据，然后使用created_at对组合输出进行排序。
For example:
例如:
assume two models, Comment & Like both belongs_to User
假设有两个模型，comments & Like both belongs_to User
return a combined list of @user's comments and likes sorted by date
返回根据日期排序的@user注释和like的组合列表
I know I can do this in SQL but I'd really like an active record solution.
我知道我可以在SQL中这样做，但我真的想要一个活动记录解决方案。
Thanks!
谢谢!
2 个解决方案
#1
21
I believe it should be as simple as:
我认为应该这么简单:
combined_sorted = (User.comments + User.likes).sort{|a,b| a.created_at <=> b.created_at }
#2
0
How about something like (untested):
比如(未经测试的):
class User < ActiveRecord::Base
scope :activities_by_date, :joins(:comments).joins(:likes).order("created_at desc")
end
Then you can do @user.activities_by_date and let the db do all the work
然后你可以做@user。activities_by_date并让db完成所有的工作
#1
21
I believe it should be as simple as:
我认为应该这么简单:
combined_sorted = (User.comments + User.likes).sort{|a,b| a.created_at <=> b.created_at }
#2
0
How about something like (untested):
比如(未经测试的):
class User < ActiveRecord::Base
scope :activities_by_date, :joins(:comments).joins(:likes).order("created_at desc")
end
Then you can do @user.activities_by_date and let the db do all the work
然后你可以做@user。activities_by_date并让db完成所有的工作