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module ActiveModel
module Validations
class NumericalityValidator < EachValidator # :nodoc:
CHECKS = { greater_than: :>, greater_than_or_equal_to: :>=,
equal_to: :==, less_than: :<, less_than_or_equal_to: :<=,
odd: :odd?, even: :even?, other_than: :!= }.freeze
RESERVED_OPTIONS = CHECKS.keys + [:only_integer]
def check_validity!
keys = CHECKS.keys - [:odd, :even]
options.slice(*keys).each do |option, value|
unless 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
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) && record.send(before_type_cast) != value
raw_value ||= value
if record_attribute_changed_in_place?(record, attr_name)
raw_value = value
end
unless is_number?(raw_value)
record.errors.add(attr_name, :not_a_number, filtered_options(raw_value))
return
end
if allow_only_integer?(record) && !is_integer?(raw_value)
record.errors.add(attr_name, :not_an_integer, filtered_options(raw_value))
return
end
unless raw_value.is_a?(Numeric)
value = parse_raw_value_as_a_number(raw_value)
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
case option_value
when Proc
option_value = option_value.call(record)
when Symbol
option_value = record.send(option_value)
end
unless value.send(CHECKS[option], option_value)
record.errors.add(attr_name, option, filtered_options(value).merge!(count: option_value))
end
end
end
end
private
def is_number?(raw_value)
!parse_raw_value_as_a_number(raw_value).nil?
rescue ArgumentError, TypeError
false
end
def parse_raw_value_as_a_number(raw_value)
Kernel.Float(raw_value) if raw_value !~ /\A0[xX]/
end
def is_integer?(raw_value)
/\A[+-]?\d+\z/ === raw_value.to_s
end
def filtered_options(value)
filtered = options.except(*RESERVED_OPTIONS)
filtered[:value] = value
filtered
end
def allow_only_integer?(record)
case options[:only_integer]
when Symbol
record.send(options[:only_integer])
when Proc
options[:only_integer].call(record)
else
options[:only_integer]
end
end
def record_attribute_changed_in_place?(record, attr_name)
record.respond_to?(:attribute_changed_in_place?) &&
record.attribute_changed_in_place?(attr_name.to_s)
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 <tt>only_integer</tt>
# is +false+) or applying it to the regular expression <tt>/\A[\+\-]?\d+\Z/</tt>
# (if <tt>only_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>: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 Integer 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>:other_than</tt> - Specifies the value must be other than 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.
#
# There is also a list of default options supported by every validator:
# +:if+, +:unless+, +:on+, +:allow_nil+, +:allow_blank+, and +:strict+ .
# See <tt>ActiveModel::Validations#validates</tt> for more information
#
# The following checks can also be supplied with a proc or a symbol which
# corresponds to a method:
#
# * <tt>:greater_than</tt>
# * <tt>:greater_than_or_equal_to</tt>
# * <tt>:equal_to</tt>
# * <tt>:less_than</tt>
# * <tt>:less_than_or_equal_to</tt>
# * <tt>:only_integer</tt>
#
# For example:
#
# class Person < ActiveRecord::Base
# validates_numericality_of :width, less_than: ->(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
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