module ActiveModel # == Active Model Numericality Validator module Validations class NumericalityValidator < EachValidator CHECKS = { :greater_than => :>, :greater_than_or_equal_to => :>=, :equal_to => :==, :less_than => :<, :less_than_or_equal_to => :<=, :odd => :odd?, :even => :even? }.freeze RESERVED_OPTIONS = CHECKS.keys + [:only_integer] def check_validity! keys = CHECKS.keys - [:odd, :even] options.slice(*keys).each do |option, value| next if value.is_a?(Numeric) || value.is_a?(Proc) || value.is_a?(Symbol) raise ArgumentError, ":#{option} must be a number, a symbol or a proc" end end def validate_each(record, attr_name, value) before_type_cast = "#{attr_name}_before_type_cast" raw_value = record.send(before_type_cast) if record.respond_to?(before_type_cast.to_sym) raw_value ||= value return if options[:allow_nil] && raw_value.nil? unless value = parse_raw_value_as_a_number(raw_value) record.errors.add(attr_name, :not_a_number, filtered_options(raw_value)) return end if options[:only_integer] unless value = parse_raw_value_as_an_integer(raw_value) record.errors.add(attr_name, :not_an_integer, filtered_options(raw_value)) return end end options.slice(*CHECKS.keys).each do |option, option_value| case option when :odd, :even unless value.to_i.send(CHECKS[option]) record.errors.add(attr_name, option, filtered_options(value)) end else option_value = option_value.call(record) if option_value.is_a?(Proc) option_value = record.send(option_value) if option_value.is_a?(Symbol) unless value.send(CHECKS[option], option_value) record.errors.add(attr_name, option, filtered_options(value).merge(:count => option_value)) end end end end protected def parse_raw_value_as_a_number(raw_value) case raw_value when /\A0[xX]/ nil else begin Kernel.Float(raw_value) rescue ArgumentError, TypeError nil end end end def parse_raw_value_as_an_integer(raw_value) raw_value.to_i if raw_value.to_s =~ /\A[+-]?\d+\Z/ end def filtered_options(value) options.except(*RESERVED_OPTIONS).merge!(:value => value) end end module HelperMethods # 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. Runs in all # validation contexts by default (+nil+), other options are :create # and :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. # # The following checks can also be supplied with a proc or a symbol which corresponds to a method: # * :greater_than # * :greater_than_or_equal_to # * :equal_to # * :less_than # * :less_than_or_equal_to # # class Person < ActiveRecord::Base # validates_numericality_of :width, :less_than => Proc.new { |person| person.height } # validates_numericality_of :width, :greater_than => :minimum_weight # end # def validates_numericality_of(*attr_names) validates_with NumericalityValidator, _merge_attributes(attr_names) end end end end