Lesson 04 Livebook: Contractual Loopholes

This notebook keeps chapter 4 focused on the first negotiated GTA rule:

> the normal law is no longer the last law

Mix.install([
  {:galactic_trade_authority, path: "../04_contract_loopholes"}
])

Compare Standard And Overridden Outcomes

state = GalacticTradeAuthority.bootstrap_registry!()

%{
  standard_tax: state.standard_water_shipment.tax_due,
  exempt_tax: state.exempt_water_shipment.tax_due,
  restricted_decision: state.permitted_restricted_shipment.route_decision,
  restricted_summary: state.permitted_restricted_shipment.override_summary
}

Inspect A Failed Restricted Shipment

try do
  GalacticTradeAuthority.Resources.Shipment.register_restricted!(%{
    manifest_number: "GTA-4005",
    quantity: 6,
    declared_value: 16_000,
    trader_id: state.syndicate_actor.id,
    origin_planet_id: state.origin_planet.id,
    destination_planet_id: state.restricted_planet.id,
    resource_id: state.restricted_resource.id
  }, actor: state.syndicate_actor)
rescue
  error in Ash.Error.Invalid ->
    error.errors
    |> Enum.map(&Exception.message/1)
end

The ledger now has to record not just what rule existed, but what document changed its outcome.