I have a bunch of subclasses of ItemViewModels (to...
# getting-startedj
Jasin Colegrove
11/21/2021, 3:28 PMI 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
j
Joffrey
11/21/2021, 4:29 PMIf 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
c
CLOVIS
11/21/2021, 6:32 PMHow new are you to the concept of interfaces and polymorphism in general?
j
Jasin Colegrove
11/21/2021, 6:58 PMI 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.
j
Joffrey
11/21/2021, 7:12 PMIf you can share a little bit of code maybe we can help you more precisely
j
Jasin Colegrove
11/21/2021, 7:41 PMhttps://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
11/21/2021, 7:42 PMthat has to be bound to the itemviewmodel so my UI will updated
Jasin Colegrove
11/21/2021, 7:46 PMwhat 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
11/21/2021, 7:46 PMand this is where it just doesn't feel right to me, i'm repeating myself and it looks ugly
j
Joffrey
11/21/2021, 11:03 PMwow 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
bindModelj
Jasin Colegrove
11/22/2021, 3:22 PMI'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
11/22/2021, 3:26 PMin 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
11/22/2021, 3:32 PMSorry that I can't more precisely illistrate the issue.
2 Views