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rails，如何在保存之前验证关联记录是否存在？

[英]rails, how to validate that an associated record exists before saving?

原文 2011-06-08 23:12:03 3 1 ruby-on-rails/ ruby-on-rails-3

I have the following models:我有以下型号：

Groups, and then GroupMembers.组，然后是 GroupMembers。

I don't want a group to be allowed to be saved there is at least one groupmember model associated via a build.我不希望允许保存一个组，至少有一个组成员 model 通过构建关联。

how can I do that in the model?我怎么能在 model 中做到这一点？ Thanks谢谢

1 个解决方案

See rails has_many minimum collection size update validation请参阅rails has_many 最小集合大小更新验证

如何在保存在rails上的ruby之前验证表中的记录 - how to validate a record in table before saving in ruby on rails

Rails根据关联记录进行验证 - Rails validate based on associated record

检查Rails中是否存在关联的记录 - Checking if an associated record exists in Rails

在保存到数据库之前检查记录是否存在-Rails，Twitter，ActiveRecord - check if record exists before saving to db - Rails, Twitter, ActiveRecord

在保存到Ruby on Rails之前如何修改记录 - How to modify a record before saving on Ruby on Rails

如何在保存Rails 4之前检查现有记录？ - How to check existing record before saving in Rails 4?

在Rails中进行设置时，验证关联的模型是否存在 - Validate that the associated model exists when set in Rails

在rails3中创建新记录之前如何检查记录是否存在？ - How to check if a record exists before creating a new one in rails3?

如何在Rails 3中取消关联记录的范围 - How to unscope an associated record in Rails 3

保存之前验证多个嵌套属性关联的模型是否相等 - Validate multiple nested attributes associated models for equality before saving

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相关问题 如何在保存在rails上的ruby之前验证表中的记录 - how to validate a record in table before saving in ruby on rails Rails根据关联记录进行验证 - Rails validate based on associated record 检查Rails中是否存在关联的记录 - Checking if an associated record exists in Rails 在保存到数据库之前检查记录是否存在-Rails，Twitter，ActiveRecord - check if record exists before saving to db - Rails, Twitter, ActiveRecord 在保存到Ruby on Rails之前如何修改记录 - How to modify a record before saving on Ruby on Rails 如何在保存Rails 4之前检查现有记录？ - How to check existing record before saving in Rails 4? 在Rails中进行设置时，验证关联的模型是否存在 - Validate that the associated model exists when set in Rails 在rails3中创建新记录之前如何检查记录是否存在？ - How to check if a record exists before creating a new one in rails3? 如何在Rails 3中取消关联记录的范围 - How to unscope an associated record in Rails 3 保存之前验证多个嵌套属性关联的模型是否相等 - Validate multiple nested attributes associated models for equality before saving

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rails，如何在保存之前验证关联记录是否存在？

问题描述

1 个解决方案

解决方案1
0 2011-06-09 00:08:41

rails，如何在保存之前验证关联记录是否存在？

问题描述

1 个解决方案

解决方案1 0 2011-06-09 00:08:41

解决方案1
0 2011-06-09 00:08:41