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Vinay Rawal answered on March 11, 2023 Popularity 2/10 Helpfulness 1/10

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Derived parameters: Executed when a request is made for the account’s derived parameters.

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Contributed on Mar 11 2023

Vinay Rawal

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Values that are allowed to be returned by parameter shape:

NumberShape: Decimal or int, StringShape: str, AccountIdShape: str, DenominationShape: str, DateShape: datetime, OptionalShape: OptionalValue, UnionShape: UnionItemValue with key in the set of valid keys of the UnionShape

api = "3.12.0"
version = "1.0.0"
PercentageShape = NumberShape(
    kind=NumberKind.PERCENTAGE, min_value=0.0, max_value=1.0, step=0.0000001
)
parameters = [
    Parameter(
        name="interest_rate",
        description="Product Interest Rate",
        display_name="Interest Rate",
        level=Level.TEMPLATE,
        shape=PercentageShape,
    ),
    Parameter(
        name="mad",
        description="Minimum Amount Due",
        display_name="Minimum Amount Due",
        level=Level.INSTANCE,
        shape=NumberShape(
            kind=NumberKind.MONEY,
        ),
        derived=True,
    ),
    Parameter(
        name="aer",
        description="Annual Equivalent Rate",
        display_name="Annual Equivalent Rate",
        level=Level.INSTANCE,
        shape=OptionalShape(PercentageShape),
        derived=True,
    ),
]
@requires(parameters=True, balances="1 days")
def derived_parameters(effective_date):
    balances = vault.get_balance_timeseries().at(date=effective_date)
    interest_rate = vault.get_parameter_timeseries(name="interest_rate").at(date=effective_date)
    return {
        "mad": _calculate_mad(balances, interest_rate),
        "aer": OptionalValue(_calculate_aer(interest_rate)),
    }
def _calculate_aer(interest_rate):
    # Assuming monthly interest payments - n = 12
    return _round(Decimal(math.pow((1 + interest_rate / 12), 12) - 1), decimal_places=4)
def _calculate_mad(balances, interest_rate):
    main_balance = balances[((DEFAULT_ADDRESS, DEFAULT_ASSET, "GBP", Phase.COMMITTED))].net
    mad = interest_rate * main_balance
    return _round(mad)
def _round(number, decimal_places=2):
    return number.copy_abs().quantize(Decimal((0, (1,), -decimal_places)), rounding=ROUND_FLOOR)

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Contributed on Apr 27 2023

Satinder Rawal

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