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module CarrierWave
# this is an internal class, used by CarrierWave::Mount so that
# we don't pollute the model with a lot of methods.
class Mounter #:nodoc:
attr_reader :column, :record, :remote_urls, :integrity_error,
:processing_error, :download_error
attr_accessor :remove, :remote_request_headers
def initialize(record, column, options={})
@record = record
@column = column
@options = record.class.uploader_options[column]
end
def uploader_class
record.class.uploaders[column]
end
def blank_uploader
uploader_class.new(record, column)
end
def identifiers
uploaders.map(&:identifier)
end
def read_identifiers
[record.read_uploader(serialization_column)].flatten.reject(&:blank?)
end
def uploaders
@uploaders ||= read_identifiers.map do |identifier|
uploader = blank_uploader
uploader.retrieve_from_store!(identifier) if identifier.present?
uploader
end
end
def cache(new_files)
return if not new_files or new_files == ""
@uploaders = new_files.map do |new_file|
uploader = blank_uploader
uploader.cache!(new_file)
uploader
end
@integrity_error = nil
@processing_error = nil
rescue CarrierWave::IntegrityError => e
@integrity_error = e
raise e unless option(:ignore_integrity_errors)
rescue CarrierWave::ProcessingError => e
@processing_error = e
raise e unless option(:ignore_processing_errors)
end
def cache_names
uploaders.map(&:cache_name).compact
end
def cache_names=(cache_names)
return if not cache_names or cache_names == "" or uploaders.any?(&:cached?)
@uploaders = cache_names.map do |cache_name|
uploader = blank_uploader
uploader.retrieve_from_cache!(cache_name)
uploader
end
rescue CarrierWave::InvalidParameter
end
def remote_urls=(urls)
return if not urls or urls == "" or urls.all?(&:blank?)
@remote_urls = urls
@download_error = nil
@integrity_error = nil
@uploaders = urls.zip(remote_request_headers || []).map do |url, header|
uploader = blank_uploader
uploader.download!(url, header || {})
uploader
end
rescue CarrierWave::DownloadError => e
@download_error = e
raise e unless option(:ignore_download_errors)
rescue CarrierWave::ProcessingError => e
@processing_error = e
raise e unless option(:ignore_processing_errors)
rescue CarrierWave::IntegrityError => e
@integrity_error = e
raise e unless option(:ignore_integrity_errors)
end
def store!
if remove?
remove!
else
uploaders.reject(&:blank?).each(&:store!)
end
end
def urls(*args)
uploaders.map { |u| u.url(*args) }
end
def blank?
uploaders.none?(&:present?)
end
def remove?
remove.present? && remove !~ /\A0|false$\z/
end
def remove!
uploaders.reject(&:blank?).each(&:remove!)
@uploaders = []
end
def serialization_column
option(:mount_on) || column
end
def remove_previous(before=nil, after=nil)
after ||= []
return unless before
# both 'before' and 'after' can be string when 'mount_on' option is set
before = before.reject(&:blank?).map do |value|
if value.is_a?(String)
uploader = blank_uploader
uploader.retrieve_from_store!(value)
uploader
else
value
end
end
after_paths = after.reject(&:blank?).map do |value|
if value.is_a?(String)
uploader = blank_uploader
uploader.retrieve_from_store!(value)
uploader
else
value
end.path
end
before.each do |uploader|
if uploader.remove_previously_stored_files_after_update and not after_paths.include?(uploader.path)
uploader.remove!
end
end
end
attr_accessor :uploader_options
private
def option(name)
self.uploader_options ||= {}
self.uploader_options[name] ||= record.class.uploader_option(column, name)
end
end # Mounter
end # CarrierWave
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