Parse Cloud Code relational query syntax

This stretch:

// Also only fetch if never been sent before 
// HERE SHOULD USE THE BELOW RELATIONSHIP
var innerQuery = new Parse.Query(Parse.User);
innerQuery.exists(Parse.User);
query.matchesQuery("sentTo", innerQuery);

Could be changed to:

// Also only fetch if never been sent before 
query.notContainedIn("sentTo",[Parse.User.current()])

That works.Parse Query