[bug]: Setting Dynamic Default Form Values Does Not Work

[gabrielmcreynolds]

Describe the bug

I am using a form view widget in stacked. I would like to dynamically set the initial value of a text field based on the props passed to the component, thus I cannot use the initialValue property inside the FormView decorator. My current approach is to accept an object containing the form values inside of my constructor of the view model and set the form values. However, this does not updating my text fields with the correct values.

To reproduce

Inside of my form's view model's constructor, I'm accepting the object containing the form's values and setting those.

  SetTourInfoModel(Tour tour) {
    titleValue = tour.title;
    descriptionValue = tour.description;
    rebuildUi(); // not sure if this is necessary but included it for the sake of completeness.
  }

and I call this function inside the widget like:

  @override
  SetTourInfoModel viewModelBuilder(
    BuildContext context,
  ) =>
      SetTourInfoModel(initialTour); // where initialTour is a variable passed into widget's constructor

Expected behavior

This should set the form's text field values to be the ones described in the Tour object I'm passing to my view model.

Screenshots

No response

Additional Context

No response

[gabrielmcreynolds]

This was user error. Instead of setting the values in the view model's constructor I'm calling an initFormValues inside the onViewModelReady function and setting the form values there. It might be helpful to document this process on the docs as the existing docs on forms is extremely simplistic. I look forward to the "deep dive of Stacked Forms" coming soon!

[gabrielmcreynolds]

I still can't seem to get forms with initial values working. I'm calling my initValues in my form model like the following:

 @override
  void onViewModelReady(SetTourInfoModel viewModel) {
    syncFormWithViewModel(viewModel);
    viewModel.initFormValues();
  }

If I open the widget that uses the form, edit it, close it, then open it again I get the following error:

setState() or markNeedsBuild() called during build.

With the stack trace leading to my viewModel.initFormValues() call. For reference, here is that function inside the view model:

  initFormValues() {
    titleValue = _initialTour?.title;
    descriptionValue = _initialTour?.description;
  }

[FilledStacks]

You should call initFormValues on a postFrameCallback just to be safe.

It's trying to rebuild the tree while it's rebuilding.