Guinea Pig Partnership and Ancestor App

Daml templates designed to handle guinea pig ownership and guinea pig offspring production. Two guinea pigs can be paired into couples to produce offspring. Couples can be broken up again by their respective owners, and guinea pigs can be gifted to a different owner if both parties agree to it. Guinea pigs remember one of their ancestors.

I. Overview

This project was created by using the empty-skeleton template. The project adopts and exemplifies the proposal-accept design pattern. A signatory can create a CoupleRequest contract. Then they can exercise the ProposeCoupleRequest choice as a controller to get the CoupleRequest proposal either approved or rejected by the other owner. If the other owner rejects the requests, than the two guinea pigs are not a couple. Upon exercising the AcceptCoupleRequest choice, a Couple contract is created.

II. Workflow

The owner of a guinea pig may send a request to pair two guinea pigs into a couple.
The owner of the other guinea pig (which may be the same owner) can either accept or refuse the request.
Once accepted, the couple may produce offspring which is owned by the party that initiated the pairing.
At any point, the couple may be broken up by either party.
Guinea pigs can produce unexpected offspring, that is offspring with illegitimate partners.

III. Challenge(s)

Guinea Pigs need to be publically viewable. We have to add a public party and make every user canReadAs public. The respective code is taken from daml new demo1 --template create-daml-app and simplified.
The project was created by using empty-skeleton and the following was removed from daml.yaml:

sandbox-options:
   - --wall-clock-time

and replaced with the following:

exposed-modules:
  - Main
navigator-options:
 - --feature-user-management=false

For more info, check out this post on Daml Forum and Daml Doc.

IV. Building

To compile the project

$ daml build

V. Testing

To test all scripts: Either run the pre-written script in the Test.daml under /daml OR run:

$ daml start

VI. Running

To load the project into the sandbox and start navigator:

$ daml start

fendor / DamlFundamentalsSampleApp