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