method

validates_numericality_of

v2.2.1 - Show latest stable - Class: ActiveRecord::Validations::ClassMethods

validates_numericality_of(*attr_names)

public

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.

# File activerecord/lib/active_record/validations.rb, line 938
      def validates_numericality_of(*attr_names)
        configuration = { :on => :save, :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|
          raw_value = record.send("#{attr_name}_before_type_cast") || value

          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
                record.errors.add(attr_name, option, :default => configuration[:message], :value => raw_value, :count => configuration[option]) unless raw_value.method(ALL_NUMERICALITY_CHECKS[option])[configuration[option]]
            end
          end
        end
      end

validates_numericality_of

Related methods