Rails 名为 has_many 并有限制
我想实现与 ax 条记录的 has_many 关联，并且记录将被命名。
让我们更好地解释一下。在上一个问题中，我问如何使用可选择的标记语言创建一个文本区域，我们得出的结论是，我需要一个单独的模型 Field，其中包含我需要的多个字段（language、original 和渲染）。
现在我希望能够创建一个模型，例如 User，其中包含其中两个字段。例如：about_me 和 biography。每次创建用户时如何创建这些字段，在编辑用户时编辑它们并在编辑用户时销毁它们？我如何简单地显示它们：User.about_me和User.biography？
预先感谢您的回答。
I want to achieve a has_many association with a x number of records, and the records would be named.
Let's explain that better. In a previous question I asked how to make a text area with a selectable markup language and we reached the conclusion that I needed a separate model, Field which had the multiple fields I needed (language, original and rendered).
Now I want to be able to make a model, let's say User, which had two of these fields. For example: about_me and biography. How would I create those fields every time I create the user, edit them when I edit the user and destroy them when I edit the user? And how would I display them simply writing: User.about_me and User.biography?
Thanks in advance for the answer.
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David 的解决方案创建了联合模型。
然后您必须在用户表单中包含个人资料的表单。您必须在用户模型中使用 accepts_nested_attributes_for 方法。
要在删除用户时销毁配置文件，请添加
dependent => :destroy两个模型之间的关系。David's solution creates the joint model.
Then you have to include the form of the profile in the User form. You'll have to use accepts_nested_attributes_for method in the User model.
To destroy the profile when user is deleted, add
dependent => :destroyto the relationship between the 2 models.您需要使用回调（http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html）。
例如，在您的
User模型中，有一个 after_create 回调将创建必需的字段。另外，有一个 after_save 回调来检查 user.changed 吗？如果不同，则更新字段。
You'll need to use callbacks (http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html).
For example, in your
Usermodel, have a after_create callback that will create the requisite fields.Also,have an after_save callback that checks user.changed? and if it is different, update the fields.