The document model belongs_to :user if the DOCUMENTS table has a user_id foreign key column.
如果DOCUMENTS表有一个 user_id 外键列，则文档模型为 belongs_to :user。
This information is stored in a user-defined property sheet that is applied to each document.
该信息储存在用户定义的、应用到每个文档的属性表中。
This information is stored in a user-defined property sheet that is applied to each document.
该信息储存在用户定义的、应用到每个文档的属性表中。
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