faunadb incrementbyid function

call.js

Call(Function("increment"), "topics", "254119747652682260", [
  "data",
  "clickCount"
]);


/*

each document in the topics collection looks like this: 

{
  "slug": "dev",
  "clickCount": 14
}

*/

faunaincrement.js

Query(
  Lambda(
    ["collection", "id", "path"],
    Update(Ref(Collection(Var("collection")), Var("id")), {
      data: {
        clickCount: Add(
          Select(
            Var("path"),
            Get(Ref(Collection(Var("collection")), Var("id")))
          ),
          1
        )
      }
    })
  )
);