diff options
Diffstat (limited to 'activemodel/lib/active_model/validations/length.rb')
| -rw-r--r-- | activemodel/lib/active_model/validations/length.rb | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/validations/length.rb b/activemodel/lib/active_model/validations/length.rb new file mode 100644 index 0000000000..d6c80b2c5d --- /dev/null +++ b/activemodel/lib/active_model/validations/length.rb @@ -0,0 +1,129 @@ +# frozen_string_literal: true + +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 || value.is_a?(Symbol) || value.is_a?(Proc) + raise ArgumentError, ":#{key} must be a nonnegative Integer, Infinity, Symbol, or Proc" + 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) + case check_value + when Proc + check_value = check_value.call(record) + when Symbol + check_value = record.send(check_value) + end + 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 |