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holding: Add multi-currency support for average costs calculations. (#2153)

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Fixes: #2051.
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Joseph Ho 2025-05-06 12:12:44 -04:00 • committed by GitHub
parent 60c3a04a48
commit 8c10e87387
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3 changed files with 30 additions and 11 deletions
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16
app/models/holding.rb
View file

@ -27,10 +27,18 @@ class Holding < ApplicationRecord
# Basic approximation of cost-basis
def avg_cost
avg_cost = account.entries.trades
.joins("INNER JOIN trades ON trades.id = entries.entryable_id")
.where("trades.security_id = ? AND trades.qty > 0 AND entries.date <= ?", security.id, date)
.average(:price)
avg_cost = account.trades
.with_entry
.joins(ActiveRecord::Base.sanitize_sql_array([
"LEFT JOIN exchange_rates ON (
exchange_rates.date = entries.date AND
exchange_rates.from_currency = trades.currency AND
exchange_rates.to_currency = ?
)", account.currency
]))
.where(security_id: security.id)
.where("trades.qty > 0 AND entries.date <= ?", date)
.average("trades.price * COALESCE(exchange_rates.rate, 1)")
Money.new(avg_cost || price, currency)
end

17
test/models/holding_test.rb
View file

@ -19,15 +19,26 @@ class HoldingTest < ActiveSupport::TestCase
assert_in_delta expected_nvda_weight, @nvda.weight, 0.001
end
test "calculates simple average cost basis" do
test "calculates average cost basis" do
create_trade(@amzn.security, account: @account, qty: 10, price: 212.00, date: 1.day.ago.to_date)
create_trade(@amzn.security, account: @account, qty: 15, price: 216.00, date: Date.current)
create_trade(@nvda.security, account: @account, qty: 5, price: 128.00, date: 1.day.ago.to_date)
create_trade(@nvda.security, account: @account, qty: 30, price: 124.00, date: Date.current)
assert_equal Money.new((212.0 + 216.0) / 2), @amzn.avg_cost
assert_equal Money.new((128.0 + 124.0) / 2), @nvda.avg_cost
assert_equal Money.new((212.00 + 216.00).to_d / 2), @amzn.avg_cost
assert_equal Money.new((128.00 + 124.00).to_d / 2), @nvda.avg_cost
end
test "calculates average cost basis from another currency" do
create_trade(@amzn.security, account: @account, qty: 10, price: 212.00, date: 1.day.ago.to_date, currency: "CAD")
create_trade(@amzn.security, account: @account, qty: 15, price: 216.00, date: Date.current, currency: "CAD")
create_trade(@nvda.security, account: @account, qty: 5, price: 128.00, date: 1.day.ago.to_date, currency: "CAD")
create_trade(@nvda.security, account: @account, qty: 30, price: 124.00, date: Date.current, currency: "CAD")
assert_equal Money.new((212.00 + 216.00).to_d / 2, "CAD").exchange_to("USD", fallback_rate: 1), @amzn.avg_cost
assert_equal Money.new((128.00 + 124.00).to_d / 2, "CAD").exchange_to("USD", fallback_rate: 1), @nvda.avg_cost
end
test "calculates total return trend" do

6
test/support/entries_test_helper.rb
View file

@ -28,20 +28,20 @@ module EntriesTestHelper
Entry.create! entry_defaults.merge(attributes)
end
def create_trade(security, account:, qty:, date:, price: nil)
def create_trade(security, account:, qty:, date:, price: nil, currency: "USD")
trade_price = price || Security::Price.find_by!(security: security, date: date).price
trade = Trade.new \
qty: qty,
security: security,
price: trade_price,
currency: "USD"
currency: currency
account.entries.create! \
name: "Trade",
date: date,
amount: qty * trade_price,
currency: "USD",
currency: currency,
entryable: trade
end
end