DB Transaction following a safe path

Question

I'm trying to create a DB Transaction following a safe path. So I'd like to do something using "do catch" statement, I'm wondering something like that:

    do {
        try? db.endTransaction()
        }catch{                //THIS WHOLE CODE CRASHES
            print(error.localizedDescription)
            db.rollbackTransaction()
        }

However, something is going wrong using this syntaxe. What am I doing wrong? Is this the best way to do what I want?

Answer 1

Inside a do block, you should remove the ? on try because the whole point of do is to catch errors that are thrown by things called with try. Once you do that, if your endTransaction() throws an exception, it should be caught by your catch block.