I am trying a test a use case where I have taken two assets: a car and parts. I want to link the car with different instances of parts using a transaction. My model and js files are below :
namespace org.sample.test
asset Part identified by partId {
o String partId
o String partName
o String partManufacturer
}
asset Car identified by Vin {
o String Vin
--> Part part optional
o String modelNumber
}
transaction MakeCar{
o String carid
o String carmodel
o String[] PartId
}
/**
* Sample transaction processor function.
* #param {org.sample.test.MakeCar} tx The sample transaction instance.
* #transaction
*/
async function makecar(tx) { // eslint-disable-line no-unused-vars
var factory = getFactory();
var vehicle = factory.newResource('org.sample.test','Car',tx.carid);
vehicle.modelNumber = tx.carmodel;
var part = factory.newRelationship('org.sample.test','Part',tx.PartId);
vehicle.part = part;
const assetRegistry = await getAssetRegistry('org.sample.test.Car');
await assetRegistry.add(vehicle);
// Update the asset in the asset registry.
}
I also tried first creating the asset using the getfactory then creating relations by traversing partIds one by one using array but then as my Car asset is not created yet its throwing error.
I updated my transaction fucntion :
async function makecar(tx) { // eslint-disable-line no-unused-vars
var factory = getFactory();
var part;
var vehicle = factory.newResource('org.sample.test','Car',tx.carid);
vehicle.modelNumber = tx.carmodel;
var i=0;
while (i<tx.PartId.length)
{
part = factory.newRelationship('org.sample.test','Part',tx.PartId[i]);
vehicle.part = part;
i++;
}
assetRegistry = await getAssetRegistry('org.sample.test.Car');
await assetRegistry.add(vehicle);
}
Now its giving error : t: Instance org.sample.test.Car#OOOO has property part with type org.sample.test.Part that is not derived from org.sample.test.Part[]
the problem is this line:
var part = factory.newRelationship('org.sample.test','Part',tx.PartId);
it should be [something like]:
var part = factory.newRelationship('org.example.trading','Part',tx.PartId[0]); // 1st element of an array
its because you've defined tx.PartId as an array of relationships in your transaction definition, so you need to access the relevant element.
At this point, I'm not sure how you want to move forward, but your Car (vehicle) asset has an optional one to one relationship with Part (part Id) which is the optional field in your model. Perhaps it needs to be an array of relationships ? -> Part[] part optional But replacing the line above, will at least have it working, in its present form. An example of using an array of relationships is shown in the answer in this SO: -> Creating new participant and adding array of assets by reference to it (in particular :shares array in the model there)
Related
I have a little bit unusual problem. Following code works in online playground, but id doesn't work when i'm using generated API on rest server deployed locally. When trying to post transaction i get an error.
cto file:
namespace org.dps.track
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
}
participant BU identified by buId{
o String buId
o String name
o String country
o String city
}
participant Assembler extends BU{
}
participant Manufacturer extends BU{
}
transaction Trade{
--> Item item
--> BU newOwner
}
enum status{
o IN_TRANSIT
o DEPARTURED
o DELIVERED
}
chaincode:
/**
* 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);
}
}
When trying to post transaction via Rest API i get error:
{
"error": {
"statusCode": 500,
"name": "Error",
"message": "Error trying invoke business network. Error: No valid responses from any peers.\nResponse from attempted peer comms was an error: Error: transaction returned with failure: Error: Could not find any functions to execute for transaction org.dps.track.Trade#e4764be8e037c7186774512860c0cde6d7eaed5c301ddf36c4c1ab560577861a",
"stack": "Error: Error trying invoke business network. Error: No valid responses from any peers.\nResponse from attempted peer comms was an error: Error: transaction returned with failure: Error: Could not find any functions to execute for transaction org.dps.track.Trade#e4764be8e037c7186774512860c0cde6d7eaed5c301ddf36c4c1ab560577861a\n at HLFConnection.invokeChainCode (/home/bryczek/.nvm/versions/node/v8.11.3/lib/node_modules/composer-rest-server/node_modules/composer-connector-hlfv1/lib/hlfconnection.js:1002:30)\n at <anonymous>"
}
}
Has anyone an idea what is wrong? I would be really thankful for help.
Your problem is your model file, not the transaction code. You need Assembler not BU in the relationship field for Item and for Trade
Your asset should be:
asset Item identified by itemId{
o String itemId
o String name
o String idgId
o String serialNumber
o String comment
--> Assembler owner
--> Item [] items optional
}
as Assembler is the resource class (not BU, which is an extended class - there is no registry for this).
Your transaction Trade should also reflect the same resource ie (not BU) :
transaction Trade{
--> Item item
--> Assembler newOwner
}
Other than that, it should work fine with your existing code (have tested it against a Fabric network, using the following example Trade transaction in my REST API, where previous owner was Assembler#1 and it changes related Items from the items array for Item #1)
{
"$class": "org.dps.track.Trade",
"item":"resource:org.dps.track.Item#1",
"newOwner":"resource:org.dps.track.Assembler#2"
}
I modified model file and now whe n trying to generate rest API i only get System(General business network methods), no Item, BU and Trade API, why is this happening?
cto:
/**
* New model file
*/
namespace org.dps.track
//asset section
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
}
//participant section
participant BU identified by buId{
o String buId
o String name
o String country
o String city
o participantType type
}
//tranasaction section
transaction Trade{
-->Item item
-->BU newOwner
}
enum status {
o IN_TRANSIT
o DEPARTURED
o DELIVERED
}
enum participantType{
o Manufacturer
o Assembler
}
cc:
/**
* 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', 'BU', trade.newOwner.getIdentifier());
// persist the state of the ITEM with new owner as a relationship
await assetRegistry.update(res);
}
}
model
asset Route identified by route_id {
o String route_id
o String rider_id
o String parcel_id
}
transaction assignParcelToRider {
o String rider_id
o String parcel_id
}
logic.js
var assetRegistry;
var id = assignValue.rider_id;
return getAssetRegistry('org.rytle.Route').then(function(ar) {
assetRegistry = ar;
return assetRegistry.get(id);
}).then(function(asset) {
asset.parcel_id = assignValue.parcel_id;
return assetRegistry.update(asset);
});
Here I want to find the rider_id and update parcel_id there. But here its not finding the rider_id.
The main thing is you need to get the asset, by the asset identifier when using .get() and rider_id is not that, in your model.
Also - may need more info - but it all rests on id getting a value from assignValue.rider_id and I can't tell how that was defined / asserted and whether it is within scope. I can see that id however, should be in scope for your function below - but using the correct identifier for an asset, this should work (as an example):
return getAssetRegistry('org.rytle.Route').then(function(ar) {
return ar.get(route_id) // or whatever you've assigned it to or txnobject.route.getIdentifier()); // ie you must get the asset by identifier
}).then(function(asset) {
asset.parcel_id = id;
return ar.update(asset);
});
and so on;
ps you can check out sample-networks for some examples (eg under 'test' directory) - note these now use async / await functions (instead of 'promises' shown above) which came in with Node 8 (and is far easier to write than using promises FYI)
function Exchange(exchange){
// We do the actual exchange here:
// We first need to get both actual nodes:
var nodeIdFrom=exchange.nodeIdFrom;
var quantity =exchange.quantity;
var price = exchange.price;
var nodeIdTo =exchange.nodeIdTo;
return getParticipantRegistry('org.acme.mynetwork.Node')
.then(function(ParticipantRegistry){
ParticipantRegistry.get(nodeIdFrom)
.then(function(Participant){
Participant.Need=Participant.Need+quantity;
Participant.Balance_account=Participant.Balance_account+quantity*price;
return ParticipantRegistry.update(Participant);
});
});
I'm trying to execute a transaction defined as:
transaction Exchange{
o String nodeIdFrom
o String nodeIdTo
o Double quantity
o Double Price
}
To execute a transaction (we take money somewhere and put it somewhere else). With only the ids of the nodes as a parameter.
But right now that function does not work, you can execute it on the playground but my node is not modified.
Is it possible to apply a transaction without giving node as Node (node is a Participant).
it should work - here's an example (Using a fictitious sample 'Trader' Network and like you, I have defined 'qty' as a 'Double' in the Transaction model definition itself) of updating an Asset by a specific identifier (you're doing something similar - Participant by ID) and then - updating the asset's quantity using the Promises chain below. Suggest to use console.log() for outputs too when debugging.
So - given Transaction model:
transaction TraderById {
o String tradeId
o String tradingSymbol
o Double qty
}
and an Asset modeled as:
asset Commodity identified by tradingSymbol {
o String tradingSymbol
o String description
o String mainExchange
o Double quantity
--> Trader owner
}
you can update the Asset quantity ('quantity') as follows:
/**
*
* #param {org.acme.trading.TraderById} tradeById - the trade to be processed
* #transaction
*/
function TradeById(tradeById){
var commodityRegistry;
return getAssetRegistry('org.acme.trading.Commodity')
.then(function(registry){
commodityRegistry=registry;
return commodityRegistry.get(tradeById.tradingSymbol);
})
.then(function(result){
result.quantity-=tradeById.qty;
return commodityRegistry.update(result);
});
}
In an odata webapi call which returns a PageResult I extract the requestUri from the method parameter, manipulate the filter terms and then construct a new ODataQueryOptions object using the new uri.
(The PageResult methodology is based on this post:
http://www.asp.net/web-api/overview/odata-support-in-aspnet-web-api/supporting-odata-query-options )
Here is the raw inbound uri which includes %24inlinecount=allpages
http://localhost:59459/api/apiOrders/?%24filter=OrderStatusName+eq+'Started'&filterLogic=AND&%24skip=0&%24top=10&%24inlinecount=allpages&_=1376341370337
Everything works fine in terms of the data returned except Request.GetInLineCount returns null.
This 'kills' paging on the client side as the client ui elements don't know the total number of records.
There must be something wrong with how I'm constructing the new ODataQueryOptions object.
Please see my code below. Any help would be appreciated.
I suspect this post may contain some clues https://stackoverflow.com/a/16361875/1433194 but I'm stumped.
public PageResult<OrderVm> Get(ODataQueryOptions<OrderVm> options)
{
var incomingUri = options.Request.RequestUri.AbsoluteUri;
//manipulate the uri here to suit the entity model
//(related to a transformation needed for enumerable type OrderStatusId )
//e.g. the query string may include %24filter=OrderStatusName+eq+'Started'
//I manipulate this to %24filter=OrderStatusId+eq+'Started'
ODataQueryOptions<OrderVm> options2;
var newUri = incomingUri; //pretend it was manipulated as above
//Reconstruct the ODataQueryOptions with the modified Uri
var request = new HttpRequestMessage(HttpMethod.Get, newUri);
//construct a new options object using the new request object
options2 = new ODataQueryOptions<OrderVm>(options.Context, request);
//Extract a queryable from the repository. contents is an IQueryable<Order>
var contents = _unitOfWork.OrderRepository.Get(null, o => o.OrderByDescending(c => c.OrderId), "");
//project it onto the view model to be used in a grid for display purposes
//the following projections etc work fine and do not interfere with GetInlineCount if
//I avoid the step of constructing and using a new options object
var ds = contents.Select(o => new OrderVm
{
OrderId = o.OrderId,
OrderCode = o.OrderCode,
CustomerId = o.CustomerId,
AmountCharged = o.AmountCharged,
CustomerName = o.Customer.FirstName + " " + o.Customer.LastName,
Donation = o.Donation,
OrderDate = o.OrderDate,
OrderStatusId = o.StatusId,
OrderStatusName = ""
});
//note the use of 'options2' here replacing the original 'options'
var settings = new ODataQuerySettings()
{
PageSize = options2.Top != null ? options2.Top.Value : 5
};
//apply the odata transformation
//note the use of 'options2' here replacing the original 'options'
IQueryable results = options2.ApplyTo(ds, settings);
//Update the field containing the string representation of the enum
foreach (OrderVm row in results)
{
row.OrderStatusName = row.OrderStatusId.ToString();
}
//get the total number of records in the result set
//THIS RETURNS NULL WHEN USING the 'options2' object - THIS IS MY PROBLEM
var count = Request.GetInlineCount();
//create the PageResult object
var pr = new PageResult<OrderVm>(
results as IEnumerable<OrderVm>,
Request.GetNextPageLink(),
count
);
return pr;
}
EDIT
So the corrected code should read
//create the PageResult object
var pr = new PageResult<OrderVm>(
results as IEnumerable<OrderVm>,
request.GetNextPageLink(),
request.GetInlineCount();
);
return pr;
EDIT
Avoided the need for a string transformation of the enum in the controller method by applying a Json transformation to the OrderStatusId property (an enum) of the OrderVm class
[JsonConverter(typeof(StringEnumConverter))]
public OrderStatus OrderStatusId { get; set; }
This does away with the foreach loop.
InlineCount would be present only when the client asks for it through the $inlinecount query option.
In your modify uri logic add the query option $inlinecount=allpages if it is not already present.
Also, there is a minor bug in your code. The new ODataQueryOptions you are creating uses a new request where as in the GetInlineCount call, you are using the old Request. They are not the same.
It should be,
var count = request.GetInlineCount(); // use the new request that your created, as that is what you applied the query to.
I am currently trying to do retrieve text from sqlite. I see that the amount of data requested do come correctly, but content, on the other hand, seems to be in an incorrect format. I've tried some conversion:
var data:Array = sqls.getResult().data;
var stData:String = String(data[0]);
Alert.show(stData); // <--- displays "[object Object]"
String conversion does not seem to do what I want. I simply want the text from the sqlite database. How can I convert the [object Object] to the correct string in this case?
Irrespective of what rows are returned (with(out)) specifying columns, unless the itemClass property of the SQLStatement is defined, it will always return an anonymous object. This is essentially how remoting works with AMF.
There are two things you can do (depending on the complexity of your project):
Specify an SQLStatement.itemClass - this will define & popuplate the results of the return with public accessors (either var or get/set) with the same name as the column name.
If left as anonymous - the column names are attached to the object in which you iterate the object just as you would if it was defined.
Super basic example:
//SQL table schema
CREATE TABLE accounts (
id INTEGER PRIMARY KEY AUTOINCREMENT,
num INTEGER NOT NULL,
name TEXT NOT NULL,
last_update DATE
);
//Define an Account class:
public class Account {
public var id:int;
public var num:int;
public var name:String;
public var last_update:Date;
}
//A statement to execute to get all accounts returned as an array of "Account"
var statement:SQLStatement = new SQLStatement();
statement.sqlConnection = myConn;
statement.itemClass = Account;
statement.text = 'SELECT * FROM accounts';
statement.addEventListener(SQLEvent.RESULT, onResults);
statement.execute();
protected function onResults(event:SQLEvent):void
{
var statement:SQLStatement = SQLStatement(event.currentTarget);
var results:SQLResult = statement.getResult();
for each (var account:Account in results)
{
//do something useful like populate a model, grid, etc...
}
}
//Anonymous objects would iterate much the same way -when an item class isn't defined
protected function onResults(event:SQLEvent):void
{
var statement:SQLStatement = SQLStatement(event.currentTarget);
var results:SQLResult = statement.getResult();
for each (var account:Object in results)
{
//our 'Object' will have properties: id, num, name, last_update
//do something useful like populate a model, grid, etc...
}
}
Please try with Objectutil.toString(); function which converts an object of any kind to a string.