can't download file from google drive with ruby - ruby-on-rails

Question

I'm trying to get my rails controller set up to download a file from google drive following the code at - https://developers.google.com/drive/v2/reference/files/get
I have the following rails code
def download_file(client, file)
if file.download_url
result = client.execute(:uri => file.download_url)
if result.status == 200
return result.body
else
puts "An error occurred: #{result.data['error']['message']}"
return nil
end
end
end
def attachExternalResume
# read remote url to file
file_id = params[:fileId]
client = Google::APIClient.new
drive = client.discovered_api('drive', 'v2')
result = client.execute(
:api_method => drive.files.get,
:parameters => { 'fileId' => file_id}
)
if (result.status == 200)
p download_file client, result.data
end
end
This is being called from my javascript front end using the google picker. The user authorizes my app through the google picker and selects a file which results in my angular javascript posting the file id to my rails method. In the rails code I'm getting the following error - Missing access token.
It seems like even though the user has authorized the app on the front end, that authorization isn't making its way through to the rails side. Anyone know how I can get the authorization all the way through the process?

Answer 1

"I'm getting the following error - Missing access token." probably means that you're missing an access token. In the code snippet you posted, I can't see anywhere where you request an access token, so that makes it even more likely. I don't know enough about the Google Ruby library to give you the code you're missing, but look for something that takes scope(s) and application/client ID as arguments.