[Help Needed] Refactoring perishable-goods to Stateful: External Model Download Failure (Ergo 0.22.2)

[rockaxorb13]

Hi @mttrbrts, @dselman

I am attempting to refactor the perishable-goods template to use a stateful architecture as requested in issue #126. The goal being, to initialize the contract state with sentinel values and incrementally track sensor readings.

I checked the local environment and verified I am running @accordproject/ergo-compiler@0.22.2.

Problem:

Since the compiler is v0.22.2, I attempted to use the Modern Imports (org.accordproject.runtime, etc.) to match the standard libraries. However, the build fails immediately with a network/dependency error:

Error: Unable to download external model dependency '[https://models.accordproject.org/cicero/contract.cto](https://models.accordproject.org/cicero/contract.cto)'

It appears the CI/Test environment cannot resolve these external URLs.

I already attempted to resolve this using 2 methods:

1. Revert to Local Imports: I tried reverting to the legacy local imports (import org.accordproject.cicero.runtime.*). This bypasses the download error but causes IllegalModelException: Namespace is not defined because the 0.22.2 compiler expects the modern namespaces.

2. State Initialization: I have successfully written the init clause and logic using sentinel values (to avoid null safety issues), but I cannot compile it due to the model loading blocker above.

Please let me know if the logic is correct or not, the temperature & humidity has the -999 workaround because the compiler was not accepting comparisons such as min(null, 5.0)

/* logic.ergo */
namespace org.accordproject.perishablegoods

// Modern namespaces (Required for Ergo 0.22.2)
import org.accordproject.runtime.*
import org.accordproject.obligation.*
import org.accordproject.time.*
import org.accordproject.money.*

contract PerishableGoods over PerishableGoodsContract state PerishableGoodsState {
  
  // Init Clause to set Sentinel Values (Avoiding null issues)
  clause init(request : Request) : Response {
    set state PerishableGoodsState{
      stateId: "org.accordproject.perishablegoods.PerishableGoodsState",
      status: CREATED,
      minTemperatureRecorded: 999.0,
      maxTemperatureRecorded: -999.0,
      minHumidityRecorded: 999.0,
      maxHumidityRecorded: -999.0
    };
    return Response{}
  }

  clause ingestReading(request : SensorReading) : SensorReadingResult {
    // Standard state updates
    if (request.centigrade < state.minTemperatureRecorded)
    then set state.minTemperatureRecorded = request.centigrade
    else set state.minTemperatureRecorded = state.minTemperatureRecorded;
    
    // ... (rest of logic for Max Temp, Humidity, etc)
    
    return SensorReadingResult{}
  }
}

Is there a recommended way to reference the standard org.accordproject.* models locally in this repo without triggering the external download? The current setup seems to trap me between "Unreachable External Models" (Modern) and "Undefined Namespaces" (Legacy).

[rudrat0319]

Hi @rockaxorb13 Are you working on this issue? if not can I take this on or do you want to work together?

[rockaxorb13]

Hey, @rudrat0319 I already have built the logic, workarounds and tested it to completion, I just am waiting on the maintainers to respond on the modern imports part so I can proceed.