How to know the chain in the fabcar example? - hyperledger

Question

For example, I have a car1 that was first owner by the manufacturer and then it was transferred over to the retailer and then to the user
In the fabcar example, I can know who is its current owner by i don't know who is the previous owner.
Is there a way to do it?
Here is the http://hyperledger-fabric.readthedocs.io/en/latest/write_first_app.html example I was following

Answer 1

Is not implemented in the chaincode. To do this you could implement a new method which returns the history of the asset.
Here the link to the official documentation for nodeJS (you can find it also for GoLang):
https://fabric-shim.github.io/ChaincodeStub.html#getHistoryForKey__anchor
Here an example:
async queryValueHistory(stub,args){
if (args.length != 1) {
throw new Error('Incorrect number of arguments. Expecting identifier ex: CAR01');
}
let carId = args[0];
let iterator = await stub.getHistoryForKey(carId);
let allResults = [];
while (true) {
let res = await iterator.next();
if (res.value && res.value.value.toString()) {
let jsonRes = {};
console.log(res.value.value.toString('utf8'));
jsonRes.TxId = res.value.tx_id;
jsonRes.Timestamp = res.value.timestamp;
jsonRes.IsDelete = res.value.is_delete.toString();
try {
jsonRes.Value = JSON.parse(res.value.value.toString('utf8'));
} catch (err) {
console.log(err);
jsonRes.Value = res.value.value.toString('utf8');
}
console.info(jsonRes);
allResults.push(jsonRes);
}
if (res.done) {
console.log('end of data');
try{
await iterator.close();
}catch(err){
console.log(err);
}
console.info(allResults);
return Buffer.from(JSON.stringify(allResults));
}
}
}