I have a bunch of subclasses of ItemViewModels (tornadofx) that all have the same function that retu...

# getting-started

[Jasin Colegrove]

I have a bunch of subclasses of ItemViewModels (tornadofx) that all have the same function that returns an entitysequence from a db. Is there a way to have a function that accepts a generic(my ItemViewModel subclasses) and call the appropriate subclass.getSequence() and return the entitysequence?
It seems like this is possible but I'm having a hard time deciphering how

[Joffrey]

If they all have the same function, you can declare that function in an interface, and make them all implement that interface. Then you can declare a function that accepts that interface

[CLOVIS]

How new are you to the concept of interfaces and polymorphism in general?

[Jasin Colegrove]

I understand interfaces at a basic level. In fact I thought to use a interface with a declared function But the function getSequence in all my sub-classes is so similar it doesn't feel DRY and because it feels redudant I may be trying to overthink the situation beyond my level.

[Joffrey]

If you can share a little bit of code maybe we can help you more precisely

[Jasin Colegrove]

https://pastebin.com/nDZM8xGf this is what I have, what I need is a way to take a selected project, call the database and returns an ObservableList of said type submittals,RFIs,PCOs,COs

[Jasin Colegrove]

that has to be bound to the itemviewmodel so my UI will updated

[Jasin Colegrove]

what I've been doing is creating a new instance of said data class and populating it with the returned database call and then rebinding the model to the new instance https://pastebin.com/DG2r72L1

[Jasin Colegrove]

and this is where it just doesn't feel right to me, i'm repeating myself and it looks ugly

[Joffrey]

wow there were so many ads on pastepin I had trouble finding the code in the middle 😆 you can also use the Kotlin playground (play.kotlinlang.org) if you want to share and run code.

About your problem, I'm sorry but I have trouble understanding how your code fits together here. For instance, I don't see where the bindModel functions from the second pastebin are declared, nor where the called `model.getRFIs`/`getPCOs` etc are declared, and how they are implemented. So it's a bit difficult to help without the whole picture

[Jasin Colegrove]

I've pushed to github. You can see the entire project there. The link below is where I'm having difficulty figuring out my best course of action. https://github.com/jasin/Cobis/blob/master/src/main/kotlin/com/coleburt/cobis/controllers/NavigationController.kt

[Jasin Colegrove]

in the Nav Controller I am repeating a lot of code that is very similar. I will also need this similar code in my editor controller as well so when a submittal/RFI/PCO/CO is changed I can update the itemviewmodel. It seems to me there should be a better way to accomplish this repetitive task of accessing the DB after the DB has been updated to update my UI.

[Jasin Colegrove]

Sorry that I can't more precisely illistrate the issue.