Decimals and commas when entering a number into a Ruby on Rails form

Question

What\'s the best Ruby/Rails way to allow users to use decimals or commas when entering a number into a form? In other words, I would like the user be able to enter 2,000.99

Answer 1

I have written following code in my project. This solved all of my problems.

config/initializers/decimal_with_comma.rb

# frozen_string_literal: true

module ActiveRecord
  module Type
    class Decimal
      private

      alias_method :cast_value_without_comma_separator, :cast_value

      def cast_value(value)
        value = value.gsub(',', '') if value.is_a?(::String)
        cast_value_without_comma_separator(value)
      end
    end

    class Float
      private

      alias_method :cast_value_without_comma_separator, :cast_value

      def cast_value(value)
        value = value.gsub(',', '') if value.is_a?(::String)
        cast_value_without_comma_separator(value)
      end
    end

    class Integer
      private

      alias_method :cast_value_without_comma_separator, :cast_value

      def cast_value(value)
        value = value.gsub(',', '') if value.is_a?(::String)
        cast_value_without_comma_separator(value)
      end
    end
  end
end

module ActiveModel
  module Validations
    class NumericalityValidator
      protected

        def parse_raw_value_as_a_number(raw_value)
          raw_value = raw_value.gsub(',', '') if raw_value.is_a?(::String)
          Kernel.Float(raw_value) if raw_value !~ /\A0[xX]/
        end
    end
  end
end