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Checking and Limiting File Size of Uploaded Files with Carrierwave
# NOTE: There must be a better way to do this - help appreciated!
###############################################################
# uploaded_file.rb - utility class
###############################################################
class UploadedFile
def self.size(file)
uploaded?(file) ? file.size : nil
end
# NOTE: if I attempt to check the file size without making sure there is a file upload the fog rubygem bombs.
def self.size_limit_exceeded?(file, file_size_limit)
puts "UploadedFile.size_limit_exceeded? original_filename=#{original_filename(file)} uploaded=#{uploaded?(file)} file_class=#{file.class.name} file_size_limit=#{file_size_limit} file_size=#{size(file)}"
uploaded?(file) && size(file) > file_size_limit.megabytes
end
# FIXME: There must be a cleaner way to check if a file has been uploaded with Carrierwave
# NOTE: When the file is uploaded it seems to be an instance of CarrierWave::SanitizedFile and when
# it is not uploaded it's an instance of CarrierWave::Storage::Fog::File
def self.uploaded?(file)
original_filename(file).present?
end
def self.original_filename(file)
if file && file.respond_to?(:original_filename)
file.original_filename
else
nil
end
end
end
###############################################################
# limit_file_size_validator.rb - rails validator
###############################################################
class LimitFileSizeValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
if UploadedFile.size_limit_exceeded?(record.send(attribute).file, file_size_limit)
record.errors[attribute] << "must not be larger than #{file_size_limit} MB"
end
end
private
def file_size_limit
options[:max] || Rails.application.config.file_size_limit
end
end
###############################################################
# Usage in Rails ActiveRecord model
###############################################################
mount_uploader :pdf, PdfUploader
validates :pdf, limit_file_size: true
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