Adds an optional _id field to an object shaped type, unless the _id field is required on that type.向对象形状的类型添加可选的_id字段，除非该类型需要_id字段。 In the case _id is required, this method continues to require_id.在需要_id的情况下，此方法继续require_id。
_id
require_id
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Adds an optional _id field to an object shaped type, unless the _id field is required on that type.向对象形状的类型添加可选的_id字段，除非该类型需要_id字段。In the case _id is required, this method continues to require_id.在需要_id的情况下，此方法继续require_id。