ActiveRecord的：通过类，而不是字符串来定义关联时CLASS_NAME [英] ActiveRecord: Pass class instead of string to class_name when defining associations

问题描述

是否有任何影响或陷阱界定关联时的一类传递一个字符串，而不是？

  belongs_to的：所有者，CLASS_NAME：用户
 

相对于

  belongs_to的：所有者，CLASS_NAME：用户
 

解决方案

类可能尚未加载在这种情况下，你会得到一个 NameError：未初始化的常数用户

你应该使用用户因为这个原因，作为隐含的选项名称：：CLASS_NAME ，而不是：类

Are there any implications or gotchas to passing in a class instead of a string when defining an association?

belongs_to :owner, class_name: User

As opposed to:

belongs_to :owner, class_name: "User"

解决方案

The class may not be loaded yet in which case you'll get a NameError: uninitialized constant User.

You're supposed to use "User" for this reason, as implied by the option name: :class_name, not :class.

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