module ActiveModel module Validations module ClassMethods ALL_NUMERICALITY_CHECKS = { :greater_than => '>', :greater_than_or_equal_to => '>=', :equal_to => '==', :less_than => '<', :less_than_or_equal_to => '<=', :odd => 'odd?', :even => 'even?' }.freeze # Validates whether the value of the specified attribute is numeric by trying to convert it to # a float with Kernel.Float (if only_integer is false) or applying it to the regular expression # /\A[\+\-]?\d+\Z/ (if only_integer is set to true). # # class Person < ActiveRecord::Base # validates_numericality_of :value, :on => :create # end # # Configuration options: # * :message - A custom error message (default is: "is not a number"). # * :on - Specifies when this validation is active (default is :save, other options :create, :update). # * :only_integer - Specifies whether the value has to be an integer, e.g. an integral value (default is +false+). # * :allow_nil - Skip validation if attribute is +nil+ (default is +false+). Notice that for fixnum and float columns empty strings are converted to +nil+. # * :greater_than - Specifies the value must be greater than the supplied value. # * :greater_than_or_equal_to - Specifies the value must be greater than or equal the supplied value. # * :equal_to - Specifies the value must be equal to the supplied value. # * :less_than - Specifies the value must be less than the supplied value. # * :less_than_or_equal_to - Specifies the value must be less than or equal the supplied value. # * :odd - Specifies the value must be an odd number. # * :even - Specifies the value must be an even number. # * :if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. # * :unless - Specifies a method, proc or string to call to determine if the validation should # not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_numericality_of(*attr_names) configuration = { :only_integer => false, :allow_nil => false } configuration.update(attr_names.extract_options!) numericality_options = ALL_NUMERICALITY_CHECKS.keys & configuration.keys (numericality_options - [ :odd, :even ]).each do |option| raise ArgumentError, ":#{option} must be a number" unless configuration[option].is_a?(Numeric) end validates_each(attr_names,configuration) do |record, attr_name, value| before_type_cast = "#{attr_name}_before_type_cast" if record.respond_to?(before_type_cast.to_sym) raw_value = record.send("#{attr_name}_before_type_cast") || value else raw_value = value end next if configuration[:allow_nil] and raw_value.nil? if configuration[:only_integer] unless raw_value.to_s =~ /\A[+-]?\d+\Z/ record.errors.add(attr_name, :not_a_number, :value => raw_value, :default => configuration[:message]) next end raw_value = raw_value.to_i else begin raw_value = Kernel.Float(raw_value) rescue ArgumentError, TypeError record.errors.add(attr_name, :not_a_number, :value => raw_value, :default => configuration[:message]) next end end numericality_options.each do |option| case option when :odd, :even unless raw_value.to_i.method(ALL_NUMERICALITY_CHECKS[option])[] record.errors.add(attr_name, option, :value => raw_value, :default => configuration[:message]) end else unless raw_value.method(ALL_NUMERICALITY_CHECKS[option])[configuration[option]] record.errors.add(attr_name, option, :default => configuration[:message], :value => raw_value, :count => configuration[option]) end end end end end end end end