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如何使组件项与其父项自动更改所有者?

hyperledger-composer hyperledger hyperledger-fabric api

bryniek · 技术社区 · 7 年前

我正在学习hyperledger composer,我不知道如何修改链码以使以下模型工作:

这是我的首席技术官:

asset Item identified by itemId{
o String itemId
o String name
o String idgId
o String serialNumber
o String comment
--> BU owner
--> Item [] items optional

}
abstract participant BU identified by buId{
    o String buId
    o String name
    o String country
    o String city
}

participant Manufacturer extends BU{

}

participant Assembler extends BU{

}

链码:

function tradeCommodity(trade) {

trade.item.owner = trade.newOwner;
return getAssetRegistry('org.dps.track.Item')
    .then(function (assetRegistry) {

        var tradeNotification = getFactory().newEvent('org.dps.track',       'TradeNotification'); 
        tradeNotification.item = trade.item;
        emit(tradeNotification);

        // persist the state of the commodity
        return assetRegistry.update(trade.item);
    });

}

然后我做了两个项目:I1和I2-这是第三个项目I3的组成部分这样地:

    {
    "$class": "org.dps.track.Item",
    "itemId": "I1",
    "name": "c1",
    "idgId": "123",
    "serialNumber": "123",
    "comment": "component1",
    "owner": "resource:org.dps.track.Assembler#BU2"
  },
  {
    "$class": "org.dps.track.Item",
    "itemId": "I2",
    "name": "c2",
    "idgId": "456",
    "serialNumber": "456",
    "comment": "component2",
    "owner": "resource:org.dps.track.Assembler#BU2"
  },
  {
    "$class": "org.dps.track.Item",
    "itemId": "I3",
    "name": "complex",
    "idgId": "789",
    "serialNumber": "789",
    "comment": "item consists of items",
    "owner": "resource:org.dps.track.Assembler#BU2",
    "items": [
      "resource:org.dps.track.Item#I1",
      "resource:org.dps.track.Item#I2"
    ]
  }

然后,如果我使事务I3更改所有者,但其组件仍具有以前的所有者。如何使I1和I2在I3更改所有者时自动更改所有者。有可能做到这一点吗?我将感谢任何帮助或指导。

1 回复 | 直到 7 年前

Paul O'Mahony 7 年前

类似这样的事情(注意,这是示例代码,可能有更有效的方法来实现它,例如,聚合所有受所有权更改影响的“相关项”,然后执行一个 updateAll() 调用以更新项注册表-示例 here )-还有我使用的注释 async / await (在节点8中更具可读性)。

注意我的交易模式是:

transaction Trade { 
  --> Item item
  --> Assembler newOwner
}

更新:您还需要您的资产 Item --> Assembler owner 作为资源类(与之建立关系实例),而不是 --> BU owner是一个抽象类。

在模型文件中(ie Assembler是参与者资源)

/**
 * Sample transaction processor function.
 * @param {org.dps.track.Trade } trade The sample transaction instance.
 * @transaction
 */
async function tradeCommodity(trade) {

    const factory = getFactory();
    trade.item.owner = trade.newOwner;
    var list = [];
    if (trade.item.items && trade.item.items.length > 0) {
        trade.item.items.forEach((asset) => {
        list.push(asset);
        });
    }  


    const assetRegistry = await getAssetRegistry('org.dps.track.Item');


    // persist the state of the current ITEM
    await assetRegistry.update(trade.item);

    for (var i = 0; i < list.length; ++i) {

         let res = await assetRegistry.get(list[i].getIdentifier());
         res.owner = factory.newRelationship('org.dps.track', 'Assembler', trade.newOwner.getIdentifier());
         // persist the state of the ITEM with new owner as a relationship
         await assetRegistry.update(res);
    }

}