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A cheap knock off of the default validates_length_of validator, but checks the filesize of a Carrierwave attachment (with callback option)
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| # config/locales/en.yml | |
| en: | |
| errors: | |
| messages: | |
| wrong_size: "is the wrong size (should be %{file_size})" | |
| size_too_small: "is to small (should be at least %{file_size})" | |
| size_too_big: "is to big (should be at most %{file_size})" |
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| # lib/file_size_validator.rb | |
| # Based on: https://gist.github.com/795665 | |
| class FileSizeValidator < ActiveModel::EachValidator | |
| 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] | |
| 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 | |
| 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 ) || value.is_a?( Symbol ) | |
| raise ArgumentError, ":#{key} must be a nonnegative Integer" | |
| end | |
| end | |
| end | |
| 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] | |
| if check_value.is_a? Symbol | |
| check_value = record.send( check_value ) | |
| next unless check_value | |
| end | |
| 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 | |
| def help | |
| Helper.instance | |
| end | |
| class Helper | |
| include Singleton | |
| include ActionView::Helpers::NumberHelper | |
| end | |
| end |
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Wondering under what scenario you ended up having a symbol passed into here? What happened when you did?