You can find a list of the Active Record model validations that can be defined in the class scope here.
在这里可以找到可以在类范围中定义的ActiveRecord模型检验列表。
The framework queries two sources of metadata: the Active Record model and a custom metadata file for each model object.
框架查询两个元数据源：活动记录模型和每个模型对象的定制元数据文件。
The framework queries two sources of metadata: the Active Record model and a custom metadata file for each model object.
框架查询两个元数据源：活动记录模型和每个模型对象的定制元数据文件。
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