Module: RspecRailsMatchers::Validations::LengthOf

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# File 'lib/rspec_rails_matchers/validations/length_of.rb', line 4

def validate_length_of(attribute, options = {})
#        options.assert_valid_keys( :within, :minimum, :maximum )

  # Copy-paste from active_model/validations/length.rb:13
  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.begin, range.end
    options[:maximum] -= 1 if range.exclude_end?
  end

  if (ActiveModel::Validations::LengthValidator::CHECKS.keys & options.keys).empty?
    raise ArgumentError, 'Range unspecified. Specify the :within, :maximum, :minimum, or :is option.'
  end

  # Not need to check equals of this option's keys.
  # :if, :unless, :tokenize - should be different all time.
  # :too_long, :too_short, :wrong_length - not important for correct validation
  delete_keys = [:tokenizer, :too_long, :too_short, :wrong_length, :message, :if, :unless]
  options.delete_if { |k| delete_keys.include? k }

  actual_options = {}

  Rspec::Matchers::Matcher.new :validate_length_of, attribute do |_attr_|
    match do |model|
      if validator = model.class.validators.find(Proc.new {false}) { |v| v.to_s.demodulize =~ /^LengthValidator/ &&
          v.attributes.include?(_attr_) }
        # Same reason
        options_unfrozen = validator.options.dup
        options_unfrozen.delete_if { |k| delete_keys.include? k }
        actual_options = options_unfrozen
        options_unfrozen.deep_include?(options) && options_unfrozen.keys.sort == options.keys.sort
      end
    end

    failure_message_for_should do |model|
      RspecRailsMatchers::Message.error(
        :expected => [ "%s to validate uniqueness of %s, %s", model, _attr_, options ],
        :actual   => [ "%s to validate uniqueness of %s, %s", model, _attr_, actual_options]
      )
    end

  end
end