Using Ruby to get email attachment ID - ruby

Question

I am trying to loop through a set of emails, and get their email attachment ID. I can't seem to get down to the ID, though.
I've gotten this far:
class AccessEmailController < ApplicationController
def access_email
client = Signet::OAuth2::Client.new(access_token: session[:access_token])
service = Google::Apis::GmailV1::GmailService.new
service.authorization = client
user_id = 'me'
email_list = service.list_user_messages('me', q: "subject:(CCC Data)")
message = 'No Emails Found' if email_list.messages.empty?
email_list.messages.each do |message|
message_id = message.id
#subject = service.get_user_message(user_id, message_id).payload.parts
end
end
end
And, if I display #subject in a view, I get:
[#<Google::Apis::GmailV1::MessagePart:0x00007f8630c397a0 #headers=[#<Google::Apis::GmailV1::MessagePartHeader:0x00007f8630c344a8 #name="Content-Type", #value="multipart/alternative; boundary=\"00000000000020396d05b7ceda38\"">], #mime_type="multipart/alternative", #body=#<Google::Apis::GmailV1::MessagePartBody:0x00007f8630c39250 #size=0>, #filename="", #part_id="0", #parts=[#<Google::Apis::GmailV1::MessagePart:0x00007f8630c30588 #headers=[#<Google::Apis::GmailV1::MessagePartHeader:0x00007f8630c2d2e8 #name="Content-Type", #value="text/plain; charset=\"UTF-8\"">], #mime_type="text/plain", #body=#<Google::Apis::GmailV1::MessagePartBody:0x00007f8630c2ed50 #size=91, #data="-- \r\nKim Floyd (Davis)\r\n\r\nWeb Developer, EvenVision\r\n707.845.3073\r\nk.davis#evenvision.com\r\n">, #filename="", #part_id="0.0">, #<Google::Apis::GmailV1::MessagePart:0x00007f8630c2be98 #headers=[#<Google::Apis::GmailV1::MessagePartHeader:0x00007f8630c2a840 #name="Content-Type", #value="text/html; charset=\"UTF-8\"">, #<Google::Apis::GmailV1::MessagePartHeader:0x00007f8630c29ff8 #name="Content-Transfer-Encoding", #value="quoted-printable">], #mime_type="text/html", #body=#<Google::Apis::GmailV1::MessagePartBody:0x00007f8630c2b858 #size=344, #data="<div dir=\"ltr\"><br clear=\"all\"><div><br></div>-- <br><div dir=\"ltr\" class=\"gmail_signature\" data-smartmail=\"gmail_signature\"><div dir=\"ltr\">Kim Floyd (Davis)<div><br><div>Web Developer, EvenVision</div><div>707.845.3073</div><div>k.davis#evenvision.com</div></div></div></div></div>\r\n">, #filename="", #part_id="0.1">]>, #<Google::Apis::GmailV1::MessagePart:0x00007f8630c28f68 #headers=[#<Google::Apis::GmailV1::MessagePartHeader:0x00007f8630c27b90 #name="Content-Type", #value="image/png; name=\"image.png\"">, #<Google::Apis::GmailV1::MessagePartHeader:0x00007f8630c26fd8 #name="Content-Disposition", #value="attachment; filename=\"image.png\"">, #<Google::Apis::GmailV1::MessagePartHeader:0x00007f8630c266f0 #name="Content-Transfer-Encoding", #value="base64">, #<Google::Apis::GmailV1::MessagePartHeader:0x00007f8630c25d40 #name="X-Attachment-Id", #value="f_kjdr80n00">, #<Google::Apis::GmailV1::MessagePartHeader:0x00007f8630c25250 #name="Content-ID", #value="<f_kjdr80n00>">], #mime_type="image/png", #body=#<Google::Apis::GmailV1::MessagePartBody:0x00007f8630c28a90 #size=459005, #attachment_id="ANGjdJ9LKnYW-GChtR3_oaBWnwi0DjHG4I8ZeDuMskuJ6htxLGmwNaB-v3x0k_cP94ybJFg0HLPO0AkSLWb-zXvF25qaGyhA20R89kwPSC9j3ttVEsBhByEAxrPkJQVwKuf3H8EblPhNNfPA7iYEJ7zT56do8-_UbMbDuXo-fVU445mtPHSYHWOEX_4z8aUyNTU3MCzNY8EHz90mJRpJnseelK3whaZdcJ2E98XmxQ">, #filename="image.png", #part_id="1">]
Which, does contain the attachment I am looking for. How can I get down to that attachment, though, and get it's ID?

Answer 1

email_list.messages.each do |msg|
message = gmail.get_user_message(user_id, msg.id)
parts = message.payload.parts || []
parts.each do |part|
p part.body.attachment_id
end
end