Boolean values

[hmcfletch]

Use the following for true and false values:

FALSE_BASE = [false, 0, 'off', 'f'].freeze
TRUE_BASE = [true, 1, 'on', 't'].freeze

def boolean_variants(base)
  base.map { |f| s = f.to_s; [f, s.downcase, s.downcase.to_sym, s.upcase, s.upcase.to_sym] }.flatten.uniq
end

TRUE_VALUES = boolean_variants(TRUE_BASE).to_set.freeze
# #<Set: {true, "true", :true, "TRUE", :TRUE, 1, "1", :"1", "on", :on, "ON", :ON, "t", :t, "T", :T}>

FALSE_VALUES = boolean_variants(FALSE_BASE).to_set.freeze
# #<Set: {false, "false", :false, "FALSE", :FALSE, 0, "0", :"0", "off", :off, "OFF", :OFF, "f", :f, "F", :F}>

See ActiveRecord::Type::Boolean for the inspiration.