Class: FileSizeValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/i_am_valid/file_size_validator.rb

Overview

lib/file_size_validator.rb Based on: gist.github.com/795665

Defined Under Namespace

Classes: Helper

Constant Summary collapse

MESSAGES = 
{ :is => :wrong_size, :minimum => :size_too_small, :maximum => :size_too_big }.freeze
CHECKS = 
{ :is => :==, :minimum => :>=, :maximum => :<= }.freeze
DEFAULT_TOKENIZER = 
lambda { |value| value.split(//) }
RESERVED_OPTIONS = 
[:minimum, :maximum, :within, :is, :tokenizer, :too_short, :too_long]

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ FileSizeValidator

Returns a new instance of FileSizeValidator.



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# File 'lib/i_am_valid/file_size_validator.rb', line 11

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.begin, range.end
    options[:maximum] -= 1 if range.exclude_end?
  end

  super
end

Instance Method Details

#check_validity! ⇒ Object 



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# File 'lib/i_am_valid/file_size_validator.rb', line 21

def check_validity!
  keys = CHECKS.keys & options.keys

  if keys.empty?
    raise ArgumentError, 'Range unspecified. Specify the :within, :maximum, :minimum, or :is option.'
  end

  keys.each do |key|
    value = options[key]

    unless value.is_a?(Integer) && value >= 0
      raise ArgumentError, ":#{key} must be a nonnegative Integer"
    end
  end
end

#help ⇒ Object 



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# File 'lib/i_am_valid/file_size_validator.rb', line 60

def help
  Helper.instance
end

#validate_each(record, attribute, value) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/i_am_valid/file_size_validator.rb', line 37

def validate_each(record, attribute, value)
  raise(ArgumentError, "A CarrierWave::Uploader::Base object was expected") unless value.kind_of? CarrierWave::Uploader::Base

  value = (options[:tokenizer] || DEFAULT_TOKENIZER).call(value) if value.kind_of?(String)

  CHECKS.each do |key, validity_check|
    next unless check_value = options[key]

    value ||= [] if key == :maximum

    value_size = value.size
    next if value_size.send(validity_check, check_value)

    errors_options = options.except(*RESERVED_OPTIONS)
    errors_options[:file_size] = help.number_to_human_size 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