Introduce InterestRate so a rate carries its unit
A bare Decimal rate is ambiguous between the fraction 0,0341 and the percentage 3,41, and nothing in the type system separated them. from_fraction and from_percentage force the call site to say which one it means. Migrating the call sites showed the ambiguity was already there: several tests passed Decimal::new(45, 2), which the old code consumed as the fraction 0,45, that is 45 %, while it reads naturally as 0,45 %. Those tests exercise capital and duration rather than the rate, so their outcome is unchanged, but the reading was a coin flip before and is now explicit. The type deliberately validates nothing. Comparing buying against investing the same cash needs rates for expected return and inflation, where a negative value is meaningful and a 99 % ceiling is nonsense. Range stays a LoanOffer rule, which is where the domain knows what a plausible loan rate is. LoanOffer::annual_nominal_rate_in_percent is replaced by InterestRate:: as_percentage, so the conversion stays in immo-core instead of immo-web having to multiply by 100 itself. It normalises: dividing by 100 and multiplying back does not restore the original scale, so 3,41 % round-tripped through Display as "3.4100 %". This fixes the fraction versus percentage axis only. InterestRate carries no period, so proportional_monthly_interest_rate still returns a bare Decimal and naming alone separates annual from monthly. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Marcel Enguehard
parent
f1ba015cc3
commit
6a47fc8ccd
5 changed files with 138 additions and 50 deletions
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@ -17,6 +17,7 @@
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use rust_decimal::Decimal;
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use crate::euros::Euros;
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use crate::interest_rate::InterestRate;
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/// Une ligne de l'échéancier de référence.
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// Tous les champs ne sont pas encore lus : les jeux de test précèdent les
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@ -36,13 +37,13 @@ pub struct MonthlyInstallment {
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pub struct LoanOfferFixture {
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pub label: &'static str,
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pub borrowed_capital: Euros,
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pub annual_nominal_rate: Decimal,
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pub annual_nominal_rate: InterestRate,
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pub total_duration_in_months: u64,
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pub deferral_in_months: u64,
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pub monthly_repayment: Euros,
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pub total_credit_cost: Euros,
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pub total_paid: Euros,
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pub taeg: Decimal,
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pub taeg: InterestRate,
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pub schedule: &'static [MonthlyInstallment],
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}
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@ -5822,13 +5823,13 @@ pub fn offre_a() -> LoanOfferFixture {
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LoanOfferFixture {
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label: "Offre A — 150 000 EUR, 3,41 %, 20 ans, sans différé",
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borrowed_capital: Euros::from_cents_as_i64(150_000_00),
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annual_nominal_rate: Decimal::new(341, 4),
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annual_nominal_rate: InterestRate::from_fraction(Decimal::new(341, 4)),
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total_duration_in_months: 240,
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deferral_in_months: 0,
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monthly_repayment: Euros::from_cents_as_i64(863_02),
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total_credit_cost: Euros::from_cents_as_i64(57_124_30),
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total_paid: Euros::from_cents_as_i64(207_124_30),
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taeg: Decimal::new(3463804, 8),
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taeg: InterestRate::from_fraction(Decimal::new(3463804, 8)),
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schedule: &OFFRE_A_SCHEDULE,
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}
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}
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@ -5837,13 +5838,13 @@ pub fn offre_b_differe_total() -> LoanOfferFixture {
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LoanOfferFixture {
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label: "Offre B — 439 000 EUR, 2,45 %, 25 ans, 6 mois de différé total",
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borrowed_capital: Euros::from_cents_as_i64(439_000_00),
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annual_nominal_rate: Decimal::new(245, 4),
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annual_nominal_rate: InterestRate::from_fraction(Decimal::new(245, 4)),
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total_duration_in_months: 300,
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deferral_in_months: 6,
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monthly_repayment: Euros::from_cents_as_i64(2_011_86),
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total_credit_cost: Euros::from_cents_as_i64(152_486_18),
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total_paid: Euros::from_cents_as_i64(591_486_18),
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taeg: Decimal::new(2477699, 8),
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taeg: InterestRate::from_fraction(Decimal::new(2477699, 8)),
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schedule: &OFFRE_B_DIFFERE_TOTAL_SCHEDULE,
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}
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}
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@ -5852,13 +5853,13 @@ pub fn offre_b_differe_partiel() -> LoanOfferFixture {
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LoanOfferFixture {
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label: "Offre B' — 439 000 EUR, 2,45 %, 25 ans, 6 mois de différé partiel",
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borrowed_capital: Euros::from_cents_as_i64(439_000_00),
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annual_nominal_rate: Decimal::new(245, 4),
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annual_nominal_rate: InterestRate::from_fraction(Decimal::new(245, 4)),
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total_duration_in_months: 300,
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deferral_in_months: 6,
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monthly_repayment: Euros::from_cents_as_i64(1_987_39),
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total_credit_cost: Euros::from_cents_as_i64(150_669_69),
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total_paid: Euros::from_cents_as_i64(589_669_69),
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taeg: Decimal::new(2477699, 8),
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taeg: InterestRate::from_fraction(Decimal::new(2477699, 8)),
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schedule: &OFFRE_B_DIFFERE_PARTIEL_SCHEDULE,
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}
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}
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@ -5867,13 +5868,13 @@ pub fn offre_c_ptz() -> LoanOfferFixture {
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LoanOfferFixture {
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label: "Offre C — PTZ 95 000 EUR, 0 %, 10 ans, sans différé",
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borrowed_capital: Euros::from_cents_as_i64(95_000_00),
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annual_nominal_rate: Decimal::new(0, 0),
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annual_nominal_rate: InterestRate::from_fraction(Decimal::new(0, 0)),
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total_duration_in_months: 120,
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deferral_in_months: 0,
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monthly_repayment: Euros::from_cents_as_i64(791_67),
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total_credit_cost: Euros::from_cents_as_i64(0_00),
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total_paid: Euros::from_cents_as_i64(95_000_00),
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taeg: Decimal::new(0, 8),
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taeg: InterestRate::from_fraction(Decimal::new(0, 8)),
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schedule: &OFFRE_C_PTZ_SCHEDULE,
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}
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}
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73
crates/immo-core/src/interest_rate.rs
Normal file
73
crates/immo-core/src/interest_rate.rs
Normal file
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@ -0,0 +1,73 @@
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use std::fmt::Display;
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use rust_decimal::Decimal;
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#[derive(Debug, PartialEq, Eq, Clone, Copy, PartialOrd, Ord)]
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pub struct InterestRate {
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rate_as_fraction: Decimal,
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}
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impl InterestRate {
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pub const ZERO: Self = InterestRate {
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rate_as_fraction: Decimal::ZERO,
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};
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pub fn from_percentage(rate_in_percent: Decimal) -> Self {
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InterestRate {
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rate_as_fraction: rate_in_percent / Decimal::ONE_HUNDRED,
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}
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}
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pub const fn from_fraction(rate_as_fraction: Decimal) -> Self {
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InterestRate { rate_as_fraction }
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}
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pub const fn as_fraction(self) -> Decimal {
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self.rate_as_fraction
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}
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pub fn as_percentage(self) -> Decimal {
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(self.rate_as_fraction * Decimal::ONE_HUNDRED).normalize()
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}
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}
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impl Display for InterestRate {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "{} %", self.as_percentage())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn create_from_percentage_yields_correct_rate() {
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assert_eq!(
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InterestRate::from_percentage(Decimal::new(415, 2)).as_fraction(),
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Decimal::new(415, 4)
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);
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}
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#[test]
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fn create_from_fraction_yields_correct_rate() {
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assert_eq!(
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InterestRate::from_fraction(Decimal::new(415, 4)).as_fraction(),
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Decimal::new(415, 4)
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);
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}
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#[test]
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fn create_from_fraction_is_properly_output_as_percentage() {
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assert_eq!(
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InterestRate::from_fraction(Decimal::new(314, 4)).as_percentage(),
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Decimal::new(314, 2)
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)
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}
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#[test]
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fn display_works_as_expected_with_no_trailing_zeros() {
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let interest_rate = InterestRate::from_fraction(Decimal::new(3145, 5));
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assert_eq!(format!("{}", interest_rate), "3.145 %");
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}
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}
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@ -1,4 +1,5 @@
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pub mod euros;
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pub mod interest_rate;
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pub mod loan_offer;
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#[cfg(test)]
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@ -3,11 +3,12 @@ use rust_decimal::MathematicalOps;
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use thiserror::Error;
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use crate::euros::Euros;
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use crate::interest_rate::InterestRate;
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#[derive(Debug, PartialEq, Eq, Error, Clone)]
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pub enum LoanOfferError {
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#[error("loan cannot have a negative interest rate: {0}")]
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NegativeInterestRate(Decimal),
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NegativeInterestRate(InterestRate),
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#[error("loan duration cannot be zero")]
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ZeroLoanDuration,
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#[error("borrowed capital should be strictly positive: {0}")]
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@ -15,7 +16,7 @@ pub enum LoanOfferError {
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#[error("borrowed capital should be lower than {MAX_BORROWED_CAPITAL}: {0}")]
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MaxBorrowedCapitalExceeded(Euros),
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#[error("annual nominal rate should be lower than {MAX_ANNUAL_NOMINAL_RATE}: {0}")]
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MaxAnnualNominalRateExceeded(Decimal),
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MaxAnnualNominalRateExceeded(InterestRate),
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#[error("loan duration in months should be lower than {MAX_LOAN_DURATION_IN_MONTHS}: {0}")]
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MaxLoanDurationExceeded(u64),
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#[error("loan cannot amortise")]
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@ -26,7 +27,8 @@ pub enum LoanOfferError {
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pub const MAX_BORROWED_CAPITAL: Euros = Euros::from_cents_as_i64(999_999_999_99);
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/// 99% nominal rate will hopefully never happen
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pub const MAX_ANNUAL_NOMINAL_RATE: Decimal = Decimal::from_parts(99, 0, 0, false, 2);
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pub const MAX_ANNUAL_NOMINAL_RATE: InterestRate =
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InterestRate::from_fraction(Decimal::from_parts(99, 0, 0, false, 2));
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/// Loan duration is theoretically constrained to max 25y in France, let's use 40 to be sure
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pub const MAX_LOAN_DURATION_IN_MONTHS: u64 = 40 * 12;
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@ -34,17 +36,17 @@ pub const MAX_LOAN_DURATION_IN_MONTHS: u64 = 40 * 12;
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#[derive(Debug, PartialEq, Eq)]
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pub struct LoanOffer {
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borrowed_capital: Euros,
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annual_nominal_rate: Decimal,
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annual_nominal_rate: InterestRate,
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loan_duration_in_months: u64,
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}
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impl LoanOffer {
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pub fn new(
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borrowed_capital: Euros,
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annual_nominal_rate: Decimal,
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annual_nominal_rate: InterestRate,
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loan_duration_in_months: u64,
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) -> Result<Self, LoanOfferError> {
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if annual_nominal_rate < Decimal::ZERO {
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if annual_nominal_rate < InterestRate::ZERO {
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Err(LoanOfferError::NegativeInterestRate(annual_nominal_rate))
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} else if annual_nominal_rate > MAX_ANNUAL_NOMINAL_RATE {
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Err(LoanOfferError::MaxAnnualNominalRateExceeded(
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@ -79,12 +81,8 @@ impl LoanOffer {
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}
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}
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pub fn annual_nominal_rate_in_percent(&self) -> Decimal {
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self.annual_nominal_rate * Decimal::ONE_HUNDRED
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}
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pub fn proportional_monthly_interest_rate(&self) -> Decimal {
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self.annual_nominal_rate / Decimal::from(12)
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fn proportional_monthly_interest_rate(&self) -> Decimal {
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self.annual_nominal_rate.as_fraction() / Decimal::from(12)
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}
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pub fn monthly_repayment(&self) -> Euros {
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@ -110,23 +108,32 @@ mod tests {
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#[test]
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fn creating_loan_offer_with_negative_interest_rate_returns_negative_interest_rate_error() {
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let ret = LoanOffer::new(Euros::from_cents_as_i64(123), Decimal::new(-45, 2), 60);
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let annual_nominal_rate = InterestRate::from_percentage(Decimal::new(-45, 2));
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let ret = LoanOffer::new(Euros::from_cents_as_i64(123), annual_nominal_rate, 60);
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assert_eq!(
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ret,
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Err(LoanOfferError::NegativeInterestRate(Decimal::new(-45, 2)))
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Err(LoanOfferError::NegativeInterestRate(annual_nominal_rate))
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);
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}
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#[test]
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fn creating_loan_offer_with_null_loan_duration_returns_zero_loan_duration_error() {
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let ret = LoanOffer::new(Euros::from_cents_as_i64(123), Decimal::new(45, 2), 0);
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let ret = LoanOffer::new(
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Euros::from_cents_as_i64(123),
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InterestRate::from_percentage(Decimal::new(45, 2)),
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0,
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);
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assert_eq!(ret, Err(LoanOfferError::ZeroLoanDuration));
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}
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#[test]
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fn creating_loan_offer_with_negative_borrowed_capital_returns_non_positive_borrowed_capital_error()
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{
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let ret = LoanOffer::new(Euros::from_cents_as_i64(-1), Decimal::new(45, 2), 15);
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let ret = LoanOffer::new(
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Euros::from_cents_as_i64(-1),
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InterestRate::from_percentage(Decimal::new(45, 2)),
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15,
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);
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assert_eq!(
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ret,
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Err(LoanOfferError::NonPositiveBorrowedCapital(
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@ -139,14 +146,19 @@ mod tests {
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fn creating_loan_offer_with_borrowed_capital_higher_than_max_borrowed_capital_returns_max_borrowed_capital_exceeded_error()
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{
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let euros = MAX_BORROWED_CAPITAL + Euros::from_cents_as_i64(1);
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let ret = LoanOffer::new(euros, Decimal::new(45, 2), 25);
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let ret = LoanOffer::new(
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euros,
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InterestRate::from_percentage(Decimal::new(45, 2)),
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25,
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);
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assert_eq!(ret, Err(LoanOfferError::MaxBorrowedCapitalExceeded(euros)));
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}
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#[test]
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fn creating_loan_offer_with_annual_nominal_rate_higher_than_max_annual_nominal_rate_returns_max_annual_nominal_rate_exceeded_error()
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{
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let annual_nominal_rate = MAX_ANNUAL_NOMINAL_RATE + Decimal::new(1, 2);
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let annual_nominal_rate =
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InterestRate::from_fraction(MAX_ANNUAL_NOMINAL_RATE.as_fraction() + Decimal::new(1, 4));
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let ret = LoanOffer::new(
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Euros::from_cents_as_i64(100_000_00),
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annual_nominal_rate,
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@ -166,7 +178,7 @@ mod tests {
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let loan_duration_in_months = MAX_LOAN_DURATION_IN_MONTHS + 1;
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let ret = LoanOffer::new(
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Euros::from_cents_as_i64(100_000_00),
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Decimal::new(314, 4),
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InterestRate::from_percentage(Decimal::new(314, 2)),
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loan_duration_in_months,
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);
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assert_eq!(
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@ -180,7 +192,11 @@ mod tests {
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#[test]
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fn creating_loan_offer_with_null_borrowed_capital_returns_non_positive_borrowed_capital_error()
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{
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let ret = LoanOffer::new(Euros::from_cents_as_i64(0), Decimal::new(45, 2), 15);
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let ret = LoanOffer::new(
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Euros::from_cents_as_i64(0),
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InterestRate::from_percentage(Decimal::new(45, 2)),
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15,
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);
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assert_eq!(
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ret,
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Err(LoanOfferError::NonPositiveBorrowedCapital(
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@ -193,7 +209,7 @@ mod tests {
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fn creating_loan_offer_that_cannot_amortise_returns_loan_cannot_amortise_error() {
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let ret = LoanOffer::new(
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Euros::from_cents_as_i64(439_000_00),
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Decimal::new(99, 2),
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InterestRate::from_percentage(Decimal::from(99)),
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480,
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);
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assert_eq!(ret, Err(LoanOfferError::LoanCannotAmortise));
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@ -201,12 +217,13 @@ mod tests {
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#[test]
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fn creating_loan_offer_with_correct_inputs_works() {
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let ret = LoanOffer::new(Euros::from_cents_as_i64(10), Decimal::new(45, 2), 15);
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let annual_nominal_rate = InterestRate::from_percentage(Decimal::new(45, 2));
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let ret = LoanOffer::new(Euros::from_cents_as_i64(10), annual_nominal_rate, 15);
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assert_eq!(
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ret,
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Ok(LoanOffer {
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borrowed_capital: Euros::from_cents_as_i64(10),
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annual_nominal_rate: Decimal::new(45, 2),
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annual_nominal_rate,
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loan_duration_in_months: 15
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})
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);
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@ -222,28 +239,17 @@ mod tests {
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#[test]
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fn creating_loan_offer_with_null_interest_rate_works() {
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let ret = LoanOffer::new(Euros::from_cents_as_i64(10), Decimal::ZERO, 15);
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let ret = LoanOffer::new(Euros::from_cents_as_i64(10), InterestRate::ZERO, 15);
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assert_eq!(
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ret,
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Ok(LoanOffer {
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borrowed_capital: Euros::from_cents_as_i64(10),
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annual_nominal_rate: Decimal::ZERO,
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annual_nominal_rate: InterestRate::ZERO,
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loan_duration_in_months: 15
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})
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);
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}
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#[test]
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fn conversion_to_annual_nominal_rate_in_percent_works() {
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let offer = LoanOffer::new(
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Euros::from_cents_as_i64(150_000_00),
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Decimal::new(4, 2),
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300,
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)
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.unwrap();
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assert_eq!(offer.annual_nominal_rate_in_percent(), Decimal::new(400, 2));
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}
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#[test]
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fn monthly_repayment_works_for_standard_loan_offer() {
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let fixture = offre_a();
|
||||
|
|
|
|||
|
|
@ -552,6 +552,7 @@ RUST_HEADER = '''\
|
|||
use rust_decimal::Decimal;
|
||||
|
||||
use crate::euros::Euros;
|
||||
use crate::interest_rate::InterestRate;
|
||||
|
||||
/// Une ligne de l'échéancier de référence.
|
||||
// Tous les champs ne sont pas encore lus : les jeux de test précèdent les
|
||||
|
|
@ -571,13 +572,13 @@ pub struct MonthlyInstallment {{
|
|||
pub struct LoanOfferFixture {{
|
||||
pub label: &'static str,
|
||||
pub borrowed_capital: Euros,
|
||||
pub annual_nominal_rate: Decimal,
|
||||
pub annual_nominal_rate: InterestRate,
|
||||
pub total_duration_in_months: u64,
|
||||
pub deferral_in_months: u64,
|
||||
pub monthly_repayment: Euros,
|
||||
pub total_credit_cost: Euros,
|
||||
pub total_paid: Euros,
|
||||
pub taeg: Decimal,
|
||||
pub taeg: InterestRate,
|
||||
pub schedule: &'static [MonthlyInstallment],
|
||||
}}
|
||||
'''
|
||||
|
|
@ -619,6 +620,12 @@ def rust_decimal(value: Decimal) -> str:
|
|||
return f"Decimal::new({mantissa}, {-exponent})"
|
||||
|
||||
|
||||
def rust_interest_rate(value: Decimal) -> str:
|
||||
"""`InterestRate::from_fraction(...)`. Les taux sont stockés en fraction
|
||||
(0,0341 pour 3,41 %), comme dans `immo-core`."""
|
||||
return f"InterestRate::from_fraction({rust_decimal(value)})"
|
||||
|
||||
|
||||
def render_rust(offers: list[LoanOffer], path: str) -> str:
|
||||
chunks = [RUST_HEADER.format(path=path)]
|
||||
|
||||
|
|
@ -647,14 +654,14 @@ def render_rust(offers: list[LoanOffer], path: str) -> str:
|
|||
" LoanOfferFixture {\n"
|
||||
f" label: {rust_string(offer.label)},\n"
|
||||
f" borrowed_capital: {rust_euros(offer.borrowed_capital)},\n"
|
||||
f" annual_nominal_rate: {rust_decimal(offer.annual_nominal_rate)},\n"
|
||||
f" annual_nominal_rate: {rust_interest_rate(offer.annual_nominal_rate)},\n"
|
||||
f" total_duration_in_months: {offer.total_duration_in_months},\n"
|
||||
f" deferral_in_months: {offer.deferral_in_months},\n"
|
||||
f" monthly_repayment: {rust_euros(offer.monthly_repayment)},\n"
|
||||
f" total_credit_cost: {rust_euros(offer.total_credit_cost(rows))},\n"
|
||||
f" total_paid: {rust_euros(offer.total_paid(rows))},\n"
|
||||
" taeg: "
|
||||
f"{rust_decimal(offer.taeg(rows).quantize(Decimal('1e-8'), rounding=ROUND_HALF_UP))},\n"
|
||||
f"{rust_interest_rate(offer.taeg(rows).quantize(Decimal('1e-8'), rounding=ROUND_HALF_UP))},\n"
|
||||
f" schedule: &{offer.id.upper()}_SCHEDULE,\n"
|
||||
" }\n"
|
||||
"}\n"
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue