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module ActiveModel
# == Active Model Format Validator
module Validations
class FormatValidator < EachValidator
def validate_each(record, attribute, value)
if options[:with]
regexp = option_call(record, :with)
record_error(record, attribute, :with, value) if value.to_s !~ regexp
elsif options[:without]
regexp = option_call(record, :without)
record_error(record, attribute, :without, value) if value.to_s =~ regexp
end
end
def check_validity!
unless options.include?(:with) ^ options.include?(:without) # ^ == xor, or "exclusive or"
raise ArgumentError, "Either :with or :without must be supplied (but not both)"
end
check_options_validity(options, :with)
check_options_validity(options, :without)
end
private
def option_call(record, name)
option = options[name]
option.respond_to?(:call) ? option.call(record) : option
end
def record_error(record, attribute, name, value)
record.errors.add(attribute, :invalid, options.except(name).merge!(:value => value))
end
def check_options_validity(options, name)
option = options[name]
if option && !option.is_a?(Regexp) && !option.respond_to?(:call)
raise ArgumentError, "A regular expression or a proc or lambda must be supplied as :#{name}"
end
end
end
module HelperMethods
# Validates whether the value of the specified attribute is of the correct form, going by the regular expression provided.
# You can require that the attribute matches the regular expression:
#
# class Person < ActiveRecord::Base
# validates_format_of :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :on => :create
# end
#
# Alternatively, you can require that the specified attribute does _not_ match the regular expression:
#
# class Person < ActiveRecord::Base
# validates_format_of :email, :without => /NOSPAM/
# end
#
# You can also provide a proc or lambda which will determine the regular expression that will be used to validate the attribute
#
# class Person < ActiveRecord::Base
# # Admin can have number as a first letter in their screen name
# validates_format_of :screen_name, :with => lambda{ |person| person.admin? ? /\A[a-z0-9][a-z0-9_\-]*\Z/i : /\A[a-z][a-z0-9_\-]*\Z/i }
# end
#
# Note: use <tt>\A</tt> and <tt>\Z</tt> to match the start and end of the string, <tt>^</tt> and <tt>$</tt> match the start/end of a line.
#
# You must pass either <tt>:with</tt> or <tt>:without</tt> as an option. In addition, both must be a regular expression
# or a proc or lambda, or else an exception will be raised.
#
# Configuration options:
# * <tt>:message</tt> - A custom error message (default is: "is invalid").
# * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
# * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
# * <tt>:with</tt> - Regular expression that if the attribute matches will result in a successful validation.
# This can be provided as a proc or lambda returning regular expression which will be called at runtime.
# * <tt>:without</tt> - Regular expression that if the attribute does not match will result in a successful validation.
# This can be provided as a proc or lambda returning regular expression which will be called at runtime.
# * <tt>:on</tt> - Specifies when this validation is active. Runs in all
# validation contexts by default (+nil+), other options are <tt>:create</tt>
# and <tt>:update</tt>.
# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). 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. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
# method, proc or string should return or evaluate to a true or false value.
def validates_format_of(*attr_names)
validates_with FormatValidator, _merge_attributes(attr_names)
end
end
end
end
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