Controllers for interacting with a vacation service
Should I create a new Controller for Insert?


Yes, and here's why. From a maintenance perspective, this is nightmare waiting to happen. The problem will start to appear when you want your popup used somewhere else independent of the list. However, if you bound your popup to the list controller, you can't move it out because you potentially bound the UI of the popup to some variable in the list controller.

The state of the popup should be independent of the list, thus you need to have a controller (or should I call it "view-model") for it.

As for your code:


I suggest you use the more standard then for promises instead of success and error. This makes it easier to swap out your promise libs/native promises when the time comes.
Use breakpoints to debug code instead of alert (or console or debugger). This prevents you from potentially leaving behind debugging code when you push to production.