数値の操作 [Rails]

数値のフォーマット

参考：

Rails のフォーマットヘルパー抜粋 – Qiita

ActiveSupport::NumberHelper と ActionView::Helpers::NumberHelper の数値フォーマットメソッド | TechRacho

国際化 (I18n) API | Rails ガイド [公式]

ActiveSupport::NumericWithFormat | Ruby on Rails API [Official]

数字をカンマ区切りにする

require "active_support/core_ext/numeric/conversions"

123456789.to_s(:delimited)
# => "123,456,789"

参考：

ruby / rails で数値を3桁区切りにする方法 – Qiita

format number with comma separators? | Just Skins

Is there a rails trick to adding commas to large numbers? – Stack Overflow

number_to_delimited – ActiveSupport::NumberHelper | Ruby on Rails API [Official]

number_with_delimiter – ActionView::Helpers::NumberHelper | Ruby on Rails API [Official]

ActiveSupport::NumericWithFormat

参考：

ActiveSupport::NumericWithFormat | Ruby on Rails API [Official]

rails/conversions.rb at v5.2.3 · rails/rails – GitHub

number_with_precision

参考：

number_with_precision | Railsドキュメント (railsdoc.com)

Using number_with_precision on controller in rails3 – Stack Overflow

number_with_precision For Prices – Stack Overflow

Helpers Outside Views (comments) – RailsCasts

number_with_precision – ActionView::Helpers::NumberHelper | Ruby on Rails API [Official]

number_with_precision formatting number with hyphens – Stack Overflow

number_to_currency

参考：

number_to_currency | Railsドキュメント (railsdoc.com)

通貨の I18n は気をつけた方がいい – Qiita

通貨フォーマットの扱い – Qiita

number_to_currency – ActiveSupport::NumberHelper | Ruby on Rails API [Official]

number_to_currency – ActionView::Helpers::NumberHelper | Ruby on Rails API [Official]

number_to_human

参考：

number_to_human – ActiveSupport::NumberHelper | Ruby on Rails API [Official]

number_to_human – ActionView::Helpers::NumberHelper | Ruby on Rails API [Official]

number_to_human_size

参考：

number_to_human_size – ActiveSupport::NumberHelper | Ruby on Rails API [Official]

number_to_human_size – ActionView::Helpers::NumberHelper | Ruby on Rails API [Official]

Numeric

• byte / bytes
• kilobyte / kilobytes
• megabyte / megabytes
• gigabyte / gigabytes
• terabyte / terabytes
• second / seconds
• minute / minutes
• hour / hours
• day / days
• week / weeks
• in_milliseconds

参考：

Numeric | Ruby on Rails API [Official]

Tips

参考：

Rails の便利なメソッド 数値オブジェクト編 – Qiita