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def obtain_class
class_name = ENV['CLASS'] || ENV['class']
raise "Must specify CLASS" unless class_name
@klass = Object.const_get(class_name)
end
def obtain_attachments
name = ENV['ATTACHMENT'] || ENV['attachment']
raise "Class #{@klass.name} has no attachments specified" unless @klass.respond_to?(:attachment_definitions)
if !name.blank? && @klass.attachment_definitions.keys.include?(name)
[ name ]
else
@klass.attachment_definitions.keys
end
end
def for_all_attachments
klass = obtain_class
names = obtain_attachments
ids = klass.connection.select_values(klass.send(:construct_finder_sql, :select => 'id'))
ids.each do |id|
instance = klass.find(id)
names.each do |name|
result = if instance.send("#{ name }?")
yield(instance, name)
else
true
end
print result ? "." : "x"; $stdout.flush
end
end
puts " Done."
end
namespace :paperclip do
desc "Refreshes both metadata and thumbnails."
task :refresh => ["paperclip:refresh:metadata", "paperclip:refresh:thumbnails"]
namespace :refresh do
desc "Regenerates thumbnails for a given CLASS (and optional ATTACHMENT)."
task :thumbnails => :environment do
errors = []
for_all_attachments do |instance, name|
result = instance.send(name).reprocess!
errors << [instance.id, instance.errors] unless instance.errors.blank?
result
end
errors.each{|e| puts "#{e.first}: #{e.last.full_messages.inspect}" }
end
desc "Regenerates content_type/size metadata for a given CLASS (and optional ATTACHMENT)."
task :metadata => :environment do
for_all_attachments do |instance, name|
if file = instance.send(name).to_file
instance.send("#{name}_file_name=", instance.send("#{name}_file_name").strip)
instance.send("#{name}_content_type=", file.content_type.strip)
instance.send("#{name}_file_size=", file.size) if instance.respond_to?("#{name}_file_size")
instance.save(false)
else
true
end
end
end
end
desc "Cleans out invalid attachments. Useful after you've added new validations."
task :clean => :environment do
for_all_attachments do |instance, name|
instance.send(name).send(:validate)
if instance.send(name).valid?
true
else
instance.send("#{name}=", nil)
instance.save
end
end
end
end
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