Rails Integer の拡張を追う

それぞれ見ていく

inflections.rb

code:rails/activesupport/lib/active_support/core_ext/integer/inflections.rb(Integer#ordinalize)(ruby)

# Ordinalize turns a number into an ordinal string used to denote the

# position in an ordered sequence such as 1st, 2nd, 3rd, 4th.

#

# 1.ordinalize # => "1st"

# 2.ordinalize # => "2nd"

# 1002.ordinalize # => "1002nd"

# 1003.ordinalize # => "1003rd"

# -11.ordinalize # => "-11th"

# -1001.ordinalize # => "-1001st"

def ordinalize

ActiveSupport::Inflector.ordinalize(self)

end

code:rails/activesupport/lib/active_support/core_ext/integer/inflections.rb(Integer#ordinal)(ruby)

# Ordinal returns the suffix used to denote the position

# in an ordered sequence such as 1st, 2nd, 3rd, 4th.

#

# 1.ordinal # => "st"

# 2.ordinal # => "nd"

# 1002.ordinal # => "nd"

# 1003.ordinal # => "rd"

# -11.ordinal # => "th"

# -1001.ordinal # => "st"

def ordinal

ActiveSupport::Inflector.ordinal(self)

end

code:rails/activesupport/lib/active_support/inflector.rb(ruby)

# in case active_support/inflector is required without the rest of active_support

require "active_support/inflector/inflections"

require "active_support/inflector/transliterate"

require "active_support/inflector/methods"

code:rails/activesupport/lib/active_support/inflector/methods.rb(ruby)

# Returns the suffix that should be added to a number to denote the position

# in an ordered sequence such as 1st, 2nd, 3rd, 4th.

#

# ordinal(1) # => "st"

# ordinal(2) # => "nd"

# ordinal(1002) # => "nd"

# ordinal(1003) # => "rd"

# ordinal(-11) # => "th"

# ordinal(-1021) # => "st"

def ordinal(number)

abs_number = number.to_i.abs

if (11..13).include?(abs_number % 100)

"th"

else

case abs_number % 10

when 1; "st"

when 2; "nd"

when 3; "rd"

else "th"

end

end

end

# Turns a number into an ordinal string used to denote the position in an

# ordered sequence such as 1st, 2nd, 3rd, 4th.

#

# ordinalize(1) # => "1st"

# ordinalize(2) # => "2nd"

# ordinalize(1002) # => "1002nd"

# ordinalize(1003) # => "1003rd"

# ordinalize(-11) # => "-11th"

# ordinalize(-1021) # => "-1021st"

def ordinalize(number)

"#{number}#{ordinal(number)}"

end

実体を発見した。

multiple.rb

code:rails/activesupport/lib/active_support/core_ext/integer/multiple.rb(ruby)

# frozen_string_literal: true

class Integer

# Check whether the integer is evenly divisible by the argument.

#

# 0.multiple_of?(0) # => true

# 6.multiple_of?(5) # => false

# 10.multiple_of?(2) # => true

def multiple_of?(number)

number != 0 ? self % number == 0 : zero?

end

end

あ、でもここはハードコーディングなのか…

time.rb

code:rails/activesupport/lib/active_support/core_ext/integer/time.rb(Integer#months)(ruby)

# Returns a Duration instance matching the number of months provided.

#

# 2.months # => 2 months

def months

ActiveSupport::Duration.months(self)

end

code:rails/activesupport/lib/active_support/core_ext/integer/time.rb(Integer#years)(ruby)

# Returns a Duration instance matching the number of years provided.

#

# 2.years # => 2 years

def years

ActiveSupport::Duration.years(self)

end

それぞれの実装は以下

code:rails/activesupport/lib/active_support/duration.rb(ruby)

end

code:rails/activesupport/lib/active_support/duration.rb(ruby)

end

code:rails console(ruby)

=> 10 months

=> ActiveSupport::Duration

これとか

code:rails/activesupport/lib/active_support/duration.rb(ActiveSupport::Duration#+)(ruby)

# Adds another Duration or a Numeric to this Duration. Numeric values

# are treated as seconds.

def +(other)

if Duration === other

parts = @parts.dup

other.parts.each do |(key, value)|

end

Duration.new(value + other.value, parts)

else

Duration.new(value + other, @parts.merge(seconds: seconds))

end

end