Error with Ruby Google Analytics API - ruby

Question

I am trying to use this Ruby Google Analytics API Dashing widget whose Ruby file is
require 'google/api_client'
require 'date'
# Update these to match your own apps credentials
service_account_email = '[YOUR SERVICE ACCOUNT EMAIL]' # Email of service account
key_file = 'path/to/your/keyfile.p12' # File containing your private key
key_secret = 'notasecret' # Password to unlock private key
profileID = '[YOUR PROFILE ID]' # Analytics profile ID.
# Get the Google API client
client = Google::APIClient.new(:application_name => '[YOUR APPLICATION NAME]',
:application_version => '0.01')
# Load your credentials for the service account
key = Google::APIClient::KeyUtils.load_from_pkcs12(key_file, key_secret)
client.authorization = Signet::OAuth2::Client.new(
:token_credential_uri => 'https://accounts.google.com/o/oauth2/token',
:audience => 'https://accounts.google.com/o/oauth2/token',
:scope => 'https://www.googleapis.com/auth/analytics.readonly',
:issuer => service_account_email,
:signing_key => key)
# Start the scheduler
SCHEDULER.every '1m', :first_in => 0 do
# Request a token for our service account
client.authorization.fetch_access_token!
# Get the analytics API
analytics = client.discovered_api('analytics','v3')
# Start and end dates
startDate = DateTime.now.strftime("%Y-%m-01") # first day of current month
endDate = DateTime.now.strftime("%Y-%m-%d") # now
# Execute the query
visitCount = client.execute(:api_method => analytics.data.ga.get, :parameters => {
'ids' => "ga:" + profileID,
'start-date' => startDate,
'end-date' => endDate,
# 'dimensions' => "ga:month",
'metrics' => "ga:visitors",
# 'sort' => "ga:month"
})
# Update the dashboard
send_event('visitor_count', { current: visitCount.data.rows[0][0] })
end
However I am getting the error Undefined method '[]' for nil:NilClass for the second last line. Can anyone shed some light on what is going on here?
EDIT:
I now know that visitCount.data is an array of NIL objects. Are there any diagnostics I can perform to make sure that that the API is connecting correctly? Can anyone suggest a possible reason why this is happening?

Answer 1

Try this, before streaming the event
if visitCount.data.rows[0].empty?
# assign some default
output = -1
else
output = visitCount.data.rows[0][0]
end
# Update the dashboard
send_event('visitor_count', { current: output })

Answer 2

OK it turns out that I was given the incorrect profile ID. It's kind of surprising that there was no error saying something like "This profile ID does not exist". That would have been way more helpful. Anyways I have the correct profile ID now and it works. In case anyone was wondering, to find the profile ID, you navigate to the analytics profile that you are interested in and the end of the url has something like pXXXXXXXX where the X's are your profile ID.