I inject an ItemViewModel that is backed by a data class

the properties of the model all get set, commit and rollback work as expected

but

item

is always null

I just switched to using the SNAPSHOT, but no change

did you initialize the item(s) after defining the data? How do you know that the model properties change if the item is always null?

Because commit and rollback produce the expected results.

@kastork uploaded a file: Untitled

I'm not sure if I see TestPlan being set to anything in this snippet - you can refer to an object with nullable properties so that they can be set later, if you wish (like so)

@amanda.hinchman-dominguez uploaded a file: Untitled

When injecting the model,you don't normally instantiate the backing object yourself.

by Inject() is supposed to do that, right?

@kastork uploaded a file: From the guide

I know you definitely can with Views and Controllers, I believe you can for models as well

This is from the guide section 11

For me everything there works, except referencing

model.item

model.item should reference the item you're w right? and modelview is not picking it up?

by inject()

never seems to instantiate

item

isn't model.item just a reaction to what modelview is picking up from the user's selection?

I don't think inject() would give model.item a value other than null, but interacting with that item in a view might

I'm also going over this section myself, as I'm trying to create a viewmodel for shapes - I'll let you know if I come through with anything 🙂

Thanks for talking it over with me

For me, I'm kind of stuck with creating an ItemViewModel from a datatype that already exists (only with my own input)

Search section 11 for "Supporting Objects that Do Not Expose JavaFX Properties"

But that's for a

ViewModel

not an

ItemViewModel

oh wow, I totally missed that - thanks!

small victories... LOL

@edvin if you ever get a minute to make an example of using a Spinner component with an

ItemViewModel

field as the assigned property, it would be helpful. I can't seem to get the Type to work right. If I

bind(MyItemModel::someIntProperty) as Property<Int>

, it compiles but

myModel.item

never populates. If I

bind { item?.someIntProperty?.toProperty() as Property<Int>

it compiles but I get

null cannot be cast to non-null type javafx.beans.property.Property<kotlin.Int>

. If I

bind { item?.someIntProperty?.toProperty() as IntegerProperty

it does not compile (

None of the following functions can be called with the arguments supplied: ...

)

@amanda.hinchman-dominguez It looks like was a misconception on my part.

by inject()

doesn't instantiate the item and isn't supposed to.

commit()

also doesn't (and I suppose isn't supposed to).

notice line

10

where the

item

is manually instantiated.

inject only instantiates the model itself, and what you do in view will instantiate the item