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@tettuan

Rails で金額、小数点、Decimal を扱う

Posted at

小数点の問題

消費税計算でありがちな浮動小数点問題
http://easyramble.com/rails-migration-with-decimal.html

BigDecimal の指定

Railsマイグレーションでdecimal型の精度（桁数）を指定
http://easyramble.com/rails-migration-with-decimal.html

通貨型

Postgresqlのデータ型一覧とRailsのマイグレーションの指定方法
http://ruby-rails.hatenadiary.com/entry/20150607/1433606267
通貨型良さそうだが、、pg向けか。

Migration

Rails API PostgreSQL money
http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/PostgreSQL/ColumnMethods.html#method-i-money
pg依存？

Gem

Money Rails
https://github.com/RubyMoney/money-rails
ちょっと複雑か気がする。。

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