给定一个订单，返回该订单和带产品的行式项目。
Given an order, return it and the line items with product. This delegates to.
给定一个行式项目，返回该行式项目和产品，这将委托给。
Given a line item, return it and the product, which delegates to.
给定一个行式项目，检索其相关的产品，包含此行式项目的订单和客户。
Given a line item, retrieve its associated product, containing order and customer.
给定一个行式项目，检索其相关的产品，包含此行式项目的订单和客户。
Given a line item, retrieve its associated product, containing order and customer.
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