activerecord/lib/active_record/type/numeric.rb


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module ActiveRecord
  module Type
    module Numeric # :nodoc:
      def number?
        true
      end

      def type_cast(value)
        value = case value
                when true then 1
                when false then 0
                when ::String then value.presence
                else value
                end
        super(value)
      end

      def changed?(old_value, _new_value, new_value_before_type_cast) # :nodoc:
        # 0 => 'wibble' should mark as changed so numericality validations run
        if nil_or_zero?(old_value) && non_numeric_string?(new_value_before_type_cast)
          # nil => '' should not mark as changed
          old_value != new_value_before_type_cast.presence
        else
          super
        end
      end

      private

      def non_numeric_string?(value)
        # 'wibble'.to_i will give zero, we want to make sure
        # that we aren't marking int zero to string zero as
        # changed.
        value !~ /\A\d+\.?\d*\z/
      end

      def nil_or_zero?(value)
        value.nil? || value == 0
      end
    end
  end
end