Hyperledger业务逻辑

Question

我在IBM Hyperledger Composer中定义了以下业务网络

========================================

  namespace org.india.invoicefinance

enum InvoiceState {
  o SUBMITTED
  o APPROVED
  o REJECTED
  o FINANCED
}

asset InvoiceLedger  identified by invoiceNumber {

    o String invoiceNumber
    o DateTime invoiceDt
    o Double amount
    o Integer creditPeriod
    o String poNumber
    o InvoiceState invoiceStatus
    --> Buyer buyer
    --> Seller seller
}
participant Buyer identified by buyerId {
    o String buyerId
    o String orgName
    o String contactName
}

participant Seller identified by sellerId {
    o String sellerId
    o String orgName
    o String contactName
}

transaction Invoice {
    o String invoiceNumber
    o DateTime invoiceDt
    o Double amount
    o Integer creditPeriod
    o String poNumber

  --> Buyer buyer
  --> Seller seller 
}
========================================

在交易处理功能中，我想执行以下验证：

买方存在于买方，卖方存在于卖方，发票编号不存在于发票分类帐中

有人能帮助或指导我实现这一目标吗？

非常感谢。Umesh

Answer 1

您可以在此处为比较运算符-> https://github.com/hyperledger/composer-sample-networks/blob/master/packages/animaltracking-network/lib/model.cto.js查看智能合约。

注意:如果您传递了对您的买方、卖方和发票号的引用(根据您的模型，所有这些都可能是transaction Invoice中的关系)，那么您就有了当前的买方、卖方和发票编号。显然，您可以连接到这些单独的注册表，以检查其他记录(如您所暗示的)。这里的查找示例-> (较简单的模型，具有多个关系的事务) https://github.com/hyperledger/composer-sample-networks/tree/master/packages/trade-network/models (较复杂的模型) https://github.com/hyperledger/composer-sample-networks/blob/master/packages/perishable-network/models/perishable.cto和txn逻辑-> https://github.com/hyperledger/composer-sample-networks/blob/master/packages/perishable-network/lib/logic.js