Download zip file from activeadmin batch action - ruby-on-rails

Question

I want to send_data to the admin who is using the activeadmin interface in our website. This data is a zip file and can be downloaded if certain conditions on the selected items are met.
I created a service that handles the logic (quite complex) behind it. So from activeadmin I can call:
batch_action :action_name, form: {selection: ['...']} do |ids, inputs|
response = MyService.new(ids, inputs[:selection]).my_method
redirect_to collection_path
end
In my service MyService.rb:
...
def my_method
...
if condition
zip_data = Zip::OutputStream.write_buffer do |zip|
zip.put_next_entry("#{original_file_name}.xml")
zip << File.read(original_file)
end
send_data(zip_data.read, :type => 'application/zip', :filename => "#{original_file_name}.zip")
# here send_data throws an error because it's a controller method
else
...
end
...
end
...
But how do I use the send_data method properly? Maybe I have to restructure something? I know you can probably do ActionController::DataStreaming.send_data(...) outside of the controller, but this is not recommended for the code's sake.

Answer 1

Solved. I put the send_datain the batch_action code like this:
batch_action :action_name, form: {selection: ['...']} do |ids, inputs|
response = MyService.new(ids, inputs[:selection]).my_method
redirect_to collection_path
send_data(response[:zip][:data].read, :type => 'application/zip', :filename => "#{response[:zip][:name]}.zip") if response[:zip].present?
end
where the response contains the zip data to send (which needs to be rewinded with zip_data.rewind before being sent). my_service.rb is now like:
...
def my_method
...
if condition
zip_data = Zip::OutputStream.write_buffer do |zip|
zip.put_next_entry("#{original_file_name}.xml")
zip << File.read(original_file)
end
zip_data.rewind
response[:zip] = {data: zip_data, name: original_file_name}
else
...
end
...
end
...