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Rails：排序关联包括而不发出新查询

[英]Rails: sort association includes without issuing new query

原文 2018-08-30 02:19:17 4 1 ruby-on-rails/ postgresql/ rails-activerecord

Person has_many: :blogs has_many: :articles 人has_many: :blogs has_many: :articles

Blog has_one: :person 博客has_one: :person

Problem: 问题：

person.<blogs and articles>.<order by last_updated>.last

I know that I can have a scope so that all returned blogs are automagically ordered by last time, but is there a way to return all blogs and articles sorted by time? 我知道我可以设置范围，以便所有上次返回的博客在上一次前都自动排序，但是有没有办法返回所有按时间排序的博客和文章？ Essentially, I'm looking for the last updated child of a parent object. 本质上，我正在寻找父对象的最后更新的子对象。

1 个解决方案

您可以整理两个查询的结果，并对结果数组进行调用排序。

(person.blogs + person.articles).sort_by(&:last_updated).last

Rails：包含多态关联 - Rails: includes with polymorphic association

Rails .includes不返回关联 - Rails .includes not returning association

自定义包括 rails 中的关联 - Custom includes association in rails

Rails协会包括数组 - Rails Association includes array

Rails-通过属性在活动记录关联中查找对象，而无需发出更多查询 - Rails - finding an object in an active record association by an attribute without issuing more queries

Rails查询包含has_many并属于关联 - Rails query with includes for has_many and belongs to association

Rails 4：使用.includes（：association）时修改热切负载查询 - Rails 4: Modify eager load query when using .includes(:association)

Rails有效地查询记录和最新的关联记录，包括吗？ - Rails query for record and latest association record efficiently with includes?

在Rails中的自定义关联上使用包含 - Using includes on a custom association in rails

在Rails 3中排序关联模型？ - Sort association models in Rails 3?

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相关问题 Rails：包含多态关联 - Rails: includes with polymorphic association Rails .includes不返回关联 - Rails .includes not returning association 自定义包括 rails 中的关联 - Custom includes association in rails Rails协会包括数组 - Rails Association includes array Rails-通过属性在活动记录关联中查找对象，而无需发出更多查询 - Rails - finding an object in an active record association by an attribute without issuing more queries Rails查询包含has_many并属于关联 - Rails query with includes for has_many and belongs to association Rails 4：使用.includes（：association）时修改热切负载查询 - Rails 4: Modify eager load query when using .includes(:association) Rails有效地查询记录和最新的关联记录，包括吗？ - Rails query for record and latest association record efficiently with includes? 在Rails中的自定义关联上使用包含 - Using includes on a custom association in rails 在Rails 3中排序关联模型？ - Sort association models in Rails 3?

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