Hello, I have a collection with an Array column containing favorite user id's. Upon user login ... I have a getUser service that maps all the users information to storage including array of favorite user id's . Everything works well. However when I have a new user login , the Rest service mapping does not work because the user doesnt have favorite s yet in the user Array column . So the mapping fails . I get a uncaught error "undefined expected to be an array" error. I am mapping to an array i created in local storage using the new Appery Storage model . It works fine unless a new user has nothing in the array column in the db then it fails. I tried adding JS in the mapping something like if (!value) { return "";} However this did not work. Please help