ActiveRecord automatically adds features to model objects based on the contents of the associated table, such as an attribute for each column in the table.
ActiveRecord根据关联表的内容(如表中每列的一个属性)自动地向模型对象添加特性。
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At last, based on attribute certificate, a model is constructed to solve the authorization and access-control problem, to realize secure access-control in the electronic government.
Based on attribute identification theory, the comprehensive evaluation model of variable weight for quality of existing R. C. structures is established to evaluate the durability of the structures.