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 <tt>integer</tt> is false) or applying it to the regular expression
# <tt>/\A[\+\-]?\d+\Z/</tt> (if <tt>integer</tt> is set to true).
#
# class Person < ActiveRecord::Base
# validates_numericality_of :value, :on => :create
# end
#
# Configuration options:
# * <tt>message</tt> - A custom error message (default is: "is not a number")
# * <tt>on</tt> Specifies when this validation is active (default is :save, other options :create, :update)
# * <tt>only_integer</tt> Specifies whether the value has to be an integer, e.g. an integral value (default is false)
# * <tt>allow_nil</tt> Skip validation if attribute is nil (default is false). Notice that for fixnum and float columns empty strings are converted to nil
# * <tt>greater_than</tt> Specifies the value must be greater than the supplied value
# * <tt>greater_than_or_equal_to</tt> Specifies the value must be greater than or equal the supplied value
# * <tt>equal_to</tt> Specifies the value must be equal to the supplied value
# * <tt>less_than</tt> Specifies the value must be less than the supplied value
# * <tt>less_than_or_equal_to</tt> Specifies the value must be less than or equal the supplied value
# * <tt>odd</tt> Specifies the value must be an odd number
# * <tt>even</tt> Specifies the value must be an even number
# * <tt>if</tt> - 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.
# * <tt>unless</tt> - 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 = { :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, configuration[:message] || ActiveRecord::Errors.default_error_messages[:not_a_number])
next
end
raw_value = raw_value.to_i
else
begin
raw_value = Kernel.Float(raw_value.to_s)
rescue ArgumentError, TypeError
record.errors.add(attr_name, configuration[:message] || ActiveRecord::Errors.default_error_messages[:not_a_number])
next
end
end
numericality_options.each do |option|
case option
when :odd, :even
record.errors.add(attr_name, configuration[:message] || ActiveRecord::Errors.default_error_messages[option]) unless raw_value.to_i.method(ALL_NUMERICALITY_CHECKS[option])[]
else
message = configuration[:message] || ActiveRecord::Errors.default_error_messages[option]
message = message % configuration[option] if configuration[option]
record.errors.add(attr_name, message) unless raw_value.method(ALL_NUMERICALITY_CHECKS[option])[configuration[option]]
end
end
end
end
end
end
end
