title: Unable to parse string to datastore.Key
body: <p>With reference to <a href="https://stackoverflow.com/questions/26593806/making-a-google-app-engine-datastore-key-from-a-string">this question</a>, I am trying to convert a datastore key from the Form to int64 and with the help of that key, trying to update a record in the datastore. I tried exactly the same code as in the answer selected in the reference link, but I get an error  which says, <code>Unable to parse key. strconv.ParseInt: parsing "/Users,6248007768440574": invalid syntax</code> </p>
  
  <p>The value I'm passing from the form is a datastore key of the format <code>/Users,6248007768440574</code>. I realize that the syntax error is because of this. Could anyone please help me in how to go about with this issue? Or, is there a method to convert a string to *datastore.Key? Any help will be appreciated</p>