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module ActiveModel
module Validations
class LengthValidator < EachValidator # :nodoc:
MESSAGES = { is: :wrong_length, minimum: :too_short, maximum: :too_long }.freeze
CHECKS = { is: :==, minimum: :>=, maximum: :<= }.freeze
RESERVED_OPTIONS = [:minimum, :maximum, :within, :is, :too_short, :too_long]
def initialize(options)
if range = (options.delete(:in) || options.delete(:within))
raise ArgumentError, ":in and :within must be a Range" unless range.is_a?(Range)
options[:minimum], options[:maximum] = range.min, range.max
end
if options[:allow_blank] == false && options[:minimum].nil? && options[:is].nil?
options[:minimum] = 1
end
super
end
def check_validity!
keys = CHECKS.keys & options.keys
if keys.empty?
raise ArgumentError, "Range unspecified. Specify the :in, :within, :maximum, :minimum, or :is option."
end
keys.each do |key|
value = options[key]
unless (value.is_a?(Integer) && value >= 0) || value == Float::INFINITY
raise ArgumentError, ":#{key} must be a nonnegative Integer or Infinity"
end
end
end
def validate_each(record, attribute, value)
value_length = value.respond_to?(:length) ? value.length : value.to_s.length
errors_options = options.except(*RESERVED_OPTIONS)
CHECKS.each do |key, validity_check|
next unless check_value = options[key]
if !value.nil? || skip_nil_check?(key)
next if value_length.send(validity_check, check_value)
end
errors_options[:count] = check_value
default_message = options[MESSAGES[key]]
errors_options[:message] ||= default_message if default_message
record.errors.add(attribute, MESSAGES[key], errors_options)
end
end
private
def skip_nil_check?(key)
key == :maximum && options[:allow_nil].nil? && options[:allow_blank].nil?
end
end
module HelperMethods
# Validates that the specified attributes match the length restrictions
# supplied. Only one constraint option can be used at a time apart from
# +:minimum+ and +:maximum+ that can be combined together:
#
# class Person < ActiveRecord::Base
# validates_length_of :first_name, maximum: 30
# validates_length_of :last_name, maximum: 30, message: "less than 30 if you don't mind"
# validates_length_of :fax, in: 7..32, allow_nil: true
# validates_length_of :phone, in: 7..32, allow_blank: true
# validates_length_of :user_name, within: 6..20, too_long: 'pick a shorter name', too_short: 'pick a longer name'
# validates_length_of :zip_code, minimum: 5, too_short: 'please enter at least 5 characters'
# validates_length_of :smurf_leader, is: 4, message: "papa is spelled with 4 characters... don't play me."
# validates_length_of :words_in_essay, minimum: 100, too_short: 'Your essay must be at least 100 words.'
#
# private
#
# def words_in_essay
# essay.scan(/\w+/)
# end
# end
#
# Constraint options:
#
# * <tt>:minimum</tt> - The minimum size of the attribute.
# * <tt>:maximum</tt> - The maximum size of the attribute. Allows +nil+ by
# default if not used with +:minimum+.
# * <tt>:is</tt> - The exact size of the attribute.
# * <tt>:within</tt> - A range specifying the minimum and maximum size of
# the attribute.
# * <tt>:in</tt> - A synonym (or alias) for <tt>:within</tt>.
#
# Other options:
#
# * <tt>:allow_nil</tt> - Attribute may be +nil+; skip validation.
# * <tt>:allow_blank</tt> - Attribute may be blank; skip validation.
# * <tt>:too_long</tt> - The error message if the attribute goes over the
# maximum (default is: "is too long (maximum is %{count} characters)").
# * <tt>:too_short</tt> - The error message if the attribute goes under the
# minimum (default is: "is too short (minimum is %{count} characters)").
# * <tt>:wrong_length</tt> - The error message if using the <tt>:is</tt>
# method and the attribute is the wrong size (default is: "is the wrong
# length (should be %{count} characters)").
# * <tt>:message</tt> - The error message to use for a <tt>:minimum</tt>,
# <tt>:maximum</tt>, or <tt>:is</tt> violation. An alias of the appropriate
# <tt>too_long</tt>/<tt>too_short</tt>/<tt>wrong_length</tt> message.
#
# There is also a list of default options supported by every validator:
# +:if+, +:unless+, +:on+ and +:strict+.
# See <tt>ActiveModel::Validations#validates</tt> for more information
def validates_length_of(*attr_names)
validates_with LengthValidator, _merge_attributes(attr_names)
end
alias_method :validates_size_of, :validates_length_of
end
end
end
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