Finally, we want to be able to update an item in our Todo list to complete it or take some notes:

/// Update a specific todo item 
drop.post("updateTodo") { request in 
    guard let id = request.headers["id"]?.int, 
        let name = request.headers["name"], 
        let description = request.headers["description"], 
        let notes = request.headers["notes"], 
        let completed = request.headers["completed"], 
        let synced = request.headers["synced"] 
        else { 
            return try JSON(node: ["message": 
                                   "Please include mandatory parameters"]) 
        } 

        let todoItem = Todo(todoId: id, 
                            name: name, 
                            description: description, 
                            notes: notes, 
                            completed: completed.toBool()!, 
                            synced: synced.toBool()!) 

        let todos = TodoStore.sharedInstance 
        let message = todos.update(item: todoItem) 
        return try JSON(node: ["message": message]) 
    } 

Here, we check for the headers first and, if they are present, we use the update method in TodoStore to update a specific item in our Store. We can test it like this:

curl -X "POST" "http://localhost:8080/updateTodo" 
  -H "Cookie: test=123" 
  -H "id: 3" 
  -H "notes: new note" 
  -H "name: updated name" 
  -H "description: updated description" 
  -H "completed: yes"

At this point, we should have a simple backend API to create, list, update, and delete Todo items in memory. In the next section, we will develop an iOS application to leverage this API.