How would you go to let your viewmodel know with which model to work ?

[stilnat]

Hi, so I'm still wrapping my head around the MVVM pattern, which feels like a right way to do things.
One thing I can't really figure out is how do you get a reference to your model.
From what I've seen, the view create an instance of viewmodel and will set binding on this instance.

You can override the getbinding method to instance a view model using a constructor with parameters, so I figured I should use that to pass it the reference to my model.

But, the view should not know anything about the model so things are getting a bit hairier here. I saw in the samples that usually an appcontext application would handle setting up instances, but I can't do that.

In my case, I need the same class view to be instantiated multiple times for multiple different objects, that can get created or destroyed at runtime. And I want the view to be instantiated whenever the player interact with the object.
I just can't really wrap my head around this.

Here's some code : I have a method that instantiate a prefab containing my view :

    private void FilterInteract(InteractionEvent interactionEvent, InteractionReference arg2)
    {
        Instantiate(FilterViewPrefab);
    }

From there, the view instantiate the viewmodel, but then I don't know how to connect my viewmodel to my model. Any clue ?

[ChebanovDD]

Hi, In one of my UITK app I use the following code:

var (isCanceled, result) = await _app
                .ShowDialogAsync<BaseTimerViewModel>(timerViewModel, cancellationToken)
                .SuppressCancellationThrow();

public async UniTask<DialogResult> ShowDialogAsync<TDialogViewModel>(IBindingContext bindingContext,
            CancellationToken cancellationToken = default) where TDialogViewModel : class, IBindingContext
{
    var dialogView = _dialogsService.GetDialogView<TDialogViewModel>();
    var dialogRoot = ((VisualElement) dialogView).parent;

    try
    {
        dialogRoot.SetChildsBindingContext(bindingContext, _objectProvider);

        await _dialogContainer.ShowAsync(dialogView, dialogRoot, cancellationToken);

        return dialogView.Result;
    }
    finally
    {
        dialogRoot.ResetChildsBindingContext(_objectProvider);
    }
}

If you use UGUI, you will need to implement the SetChildsBindingContext and ResetChildsBindingContext methods yourself. See VisualElementExtensions.cs for an example.