Lesson 05 Livebook: Shadow Market

This notebook keeps chapter 5 focused on the next GTA failure:

> the official ledger is not the same thing as the full truth

Mix.install([
  {:galactic_trade_authority, path: "../05_shadow_market"}
])

Compare Official Truth And Shadow Evidence

state = GalacticTradeAuthority.bootstrap_registry!()

%{
  official_manifest: state.official_shipment.manifest_number,
  unmatched_status: state.unmatched_report.ledger_status,
  matched_status: state.matched_report.ledger_status,
  contradicted_status: state.contradicted_report.ledger_status,
  contradicted_summary: state.contradicted_report.report_summary
}

Record A New Partial Report

GalacticTradeAuthority.Resources.ShadowReport.record!(%{
  report_number: "SR-5004",
  source_type: :seizure,
  resource_id: state.shadow_resource.id,
  destination_planet_id: state.shadow_planet.id,
  notes: "Customs impounded crates without any valid GTA manifest."
})

See The Soft Constraint Boundary

try do
  GalacticTradeAuthority.Resources.ShadowReport.record!(%{
    report_number: "SR-5005",
    source_type: :informant
  })
rescue
  error in Ash.Error.Invalid ->
    error.errors
    |> Enum.map(&Exception.message/1)
end

The chapter is not teaching that all data should become nullable. It is teaching that imperfect truth belongs in a different resource than legal truth.