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require 'active_support/core_ext/range'

module ActiveModel
  # == Active Model Exclusion Validator
  module Validations
    class ExclusionValidator < EachValidator
      ERROR_MESSAGE = "An object with the method #include? or a proc or lambda is required, " <<
                      "and must be supplied as the :in (or :within) option of the configuration hash"

      def check_validity!
        unless [:include?, :call].any? { |method| delimiter.respond_to?(method) }
          raise ArgumentError, ERROR_MESSAGE
        end
      end

      def validate_each(record, attribute, value)
        exclusions = delimiter.respond_to?(:call) ? delimiter.call(record) : delimiter
        if exclusions.send(inclusion_method(exclusions), value)
          record.errors.add(attribute, :exclusion, options.except(:in, :within).merge!(:value => value))
        end
      end

    private

      def delimiter
        @delimiter ||= options[:in] || options[:within]
      end

      # In Ruby 1.9 <tt>Range#include?</tt> on non-numeric ranges checks all possible
      # values in the range for equality, so it may be slow for large ranges. The new
      # <tt>Range#cover?</tt> uses the previous logic of comparing a value with the
      # range endpoints.
      def inclusion_method(enumerable)
        enumerable.is_a?(Range) ? :cover? : :include?
      end
    end

    module HelperMethods
      # Validates that the value of the specified attribute is not in a particular
      # enumerable object.
      #
      # class Person < ActiveRecord::Base
      # validates_exclusion_of :username, :in => %w( admin superuser ), :message => "You don't belong here"
      # validates_exclusion_of :age, :in => 30..60, :message => "This site is only for under 30 and over 60"
      # validates_exclusion_of :format, :in => %w( mov avi ), :message => "extension %{value} is not allowed"
      # validates_exclusion_of :password, :in => lambda { |p| [p.username, p.first_name] },
      # :message => "should not be the same as your username or first name"
      # end
      #
      # Configuration options:
      # * <tt>:in</tt> - An enumerable object of items that the value shouldn't be
      # part of. This can be supplied as a proc or lambda which returns an enumerable.
      # If the enumerable is a range the test is performed with <tt>Range#cover?</tt>
      # (backported in Active Support for 1.8), otherwise with <tt>include?</tt>.
      # * <tt>:within</tt> - A synonym(or alias) for <tt>:in</tt>
      # * <tt>:message</tt> - Specifies a custom error message (default is: "is reserved").
      # * <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>: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.
      # * <tt>:strict</tt> - Specifies whether validation should be strict.
      # See <tt>ActiveModel::Validation#validates!</tt> for more information.
      def validates_exclusion_of(*attr_names)
        validates_with ExclusionValidator, _merge_attributes(attr_names)
      end
    end
  end
end
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