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如何在ActiveRecord条件更新中保留新的对象层次结构？

[英]How can I preserve a new object hierarchy in an ActiveRecord conditional update?

原文 2015-08-31 13:53:13 2 1 ruby-on-rails/ activerecord

I'm building a small AR object hierarchy, say a Parent which has_many Child objects, instantiating and associating each as I go. 我正在构建一个小的AR对象层次结构，比如说一个具有has_many Child对象的Parent ，在我进行过程中实例化和关联每个对象。

Now that I have that, I need to check whether the Parent already exists before saving, and if it does then update the entire hierarchy with potentially new values for each attribute of every object. 有了这个功能之后，我需要在保存之前检查Parent是否已经存在，如果确实存在，则使用每个对象的每个属性的潜在新值更新整个层次结构。

I can't find_or_create first. 我不能先find_or_create 。 I have to build the hierarchy and then do the check and create or update. 我必须建立层次结构，然后进行检查并创建或更新。

How does Rails handle that? Rails如何处理呢？ If I only had the parent it would be much simpler, but all the attached objects make it more difficult. 如果我只有父母，那会简单得多，但是所有附加的对象都会使它更加困难。

1 个解决方案

I think, you can manage this through nested form and it is useful to store the parent/child relation data. 我认为，您可以通过嵌套形式进行管理，并且存储父/子关系数据非常有用。

Hope it is helpful for you!! 希望对您有帮助！！

如果在Rails 3中nto等于，如何将activerecord对象与新对象进行比较并进行更新？ - How to compare activerecord object to new object and update if nto equal in Rails 3?

如何用新属性扩展ActiveRecord模型？ - How can I extend ActiveRecord model with new propery?

如何使用新方法扩展ActiveRecord关系？ - How can I extend ActiveRecord relations with new method?

如何将多个相关对象分配给ActiveRecord中的对象 - How can I assign multiple related objects to an object in ActiveRecord

如何创建与ActiveRecord对象在一起的日志文件？ - How can I create a log file that stays with an ActiveRecord object?

如何在运行时扩展从ActiveRecord关联返回的对象？ - How can I extend an object returned from an ActiveRecord association at runtime?

如何将 object 转换为字符串以用于 ActiveRecord 查询？ - How can I cast an object to string for use with ActiveRecord queries?

如何删除并返回ActiveRecord关系对象中的第一个元素？ - How can I remove and return the first element in an ActiveRecord relation object?

如何打开一个类并将其转换为ActiveRecord对象？（例如，使其继承ActiveRecord :: Base） - How can I open a class and convert it into ActiveRecord object? (for example, make it inherit ActiveRecord::Base)

如何使用rspec测试条件ActiveRecord after_update回调？ - How to test conditional ActiveRecord after_update callback with rspec?

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相关问题 如果在Rails 3中nto等于，如何将activerecord对象与新对象进行比较并进行更新？ - How to compare activerecord object to new object and update if nto equal in Rails 3? 如何用新属性扩展ActiveRecord模型？ - How can I extend ActiveRecord model with new propery? 如何使用新方法扩展ActiveRecord关系？ - How can I extend ActiveRecord relations with new method? 如何将多个相关对象分配给ActiveRecord中的对象 - How can I assign multiple related objects to an object in ActiveRecord 如何创建与ActiveRecord对象在一起的日志文件？ - How can I create a log file that stays with an ActiveRecord object? 如何在运行时扩展从ActiveRecord关联返回的对象？ - How can I extend an object returned from an ActiveRecord association at runtime? 如何将 object 转换为字符串以用于 ActiveRecord 查询？ - How can I cast an object to string for use with ActiveRecord queries? 如何删除并返回ActiveRecord关系对象中的第一个元素？ - How can I remove and return the first element in an ActiveRecord relation object? 如何打开一个类并将其转换为ActiveRecord对象？（例如，使其继承ActiveRecord :: Base） - How can I open a class and convert it into ActiveRecord object? (for example, make it inherit ActiveRecord::Base) 如何使用rspec测试条件ActiveRecord after_update回调？ - How to test conditional ActiveRecord after_update callback with rspec?

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