Generates runtime Datalog facts from a normalized business event.
The event is represented in the Datalog program by the fixed atom :evt.
Generated facts are added to the program before materialization.
Generated relations
| Relation | Arity | Example |
|---|---|---|
event_type | 2 | {:evt, :deposit_received} |
event_currency | 2 | {:evt, "USD"} |
event_amount_cents | 2 | {:evt, 100000} |
event_fee_type | 2 | {:evt, :wire_fee} |
event_entity_type | 2 | {:evt, :corporate} |
event_product | 2 | {:evt, :retail_deposit} |
event_account | 2 | {:evt, "LIABILITIES:CLIENT_DEPOSITS:USD:ACME:OPERATING"} |
event_cash_account | 2 | {:evt, "ASSETS:CASH:USD:NOSTRO"} |
event_fee_income_account | 2 | {:evt, "INCOME:FEES:WIRE"} |
event_interest_expense_account | 2 | {:evt, "EXPENSES:INTEREST"} |
event_destination_account | 2 | {:evt, "LIABILITIES:CLIENT_DEPOSITS:USD:ACME:PAYROLL"} |
Only fields with non-nil values generate facts.
Summary
Functions
Returns the fixed event identifier used inside the Datalog program.
Generates a list of {relation, values} facts for normalized.
Functions
@spec event_id() :: :evt
Returns the fixed event identifier used inside the Datalog program.
Returns
:evt— the atom representing the current event in all Datalog rules.
Examples
iex> Logistiki.Knowledge.Facts.event_id()
:evt@spec generate(Logistiki.Event.Normalized.t()) :: [{atom(), [term()]}]
Generates a list of {relation, values} facts for normalized.
Arguments
normalized—%Logistiki.Event.Normalized{}— the flattened event.
Returns
[{atom(), [term()]}]— a list of{relation_name, argument_list}tuples ready to be added to the Datalog program.
Examples
iex> facts = Logistiki.Knowledge.Facts.generate(%Logistiki.Event.Normalized{
...> type: "deposit_received", amount: Decimal.new("1000.00"), currency: "USD",
...> account_code: "LIAB:ACME", cash_account_code: "ASSETS:CASH"
...> })
iex> {:event_type, [:evt, :deposit_received]} in facts
true
iex> {:event_currency, [:evt, "USD"]} in facts
true
iex> {:event_amount_cents, [:evt, 100000]} in facts
true