how to get selections from multi_select_flutter? - flutter

Question

has to be something simple I'm not getting but have been struggling on this for way too long. If anybody can help me out I would be appreciative. I believe it has to do with some kind of type issues as when I make selections I have a print statement that then prints out what I'm getting back:
[Instance of 'MultiSelectItem', Instance of 'Analysis', Instance of 'Analysis']
Not sure how to convert the above to a List of Analysis and not able to carry out per the example for the package:
MultiSelectDialogField(
items: _animals.map((e) => MultiSelectItem(e, e.name)).toList(),
listType: MultiSelectListType.CHIP,
onConfirm: (values) {
_selectedAnimals = values;
},
),
where I also have to use a 'cast' in my code. My attempt:
MultiSelectDialogField(
items: _analyses.map((analysis) => MultiSelectItem<Analysis>(analysis, analysis.name)).toList(),
initialValue: outwardsData.outwards[widget.index].lossFeed
.map((analysis) => MultiSelectItem<Analysis>(analysis, analysis.name))
.toList(),
title: Text(
"Loss Feeds:",
style: TextStyle(color: Colors.black),
),
selectedColor: kConvexGreen,
unselectedColor: kConvexLightGreen,
backgroundColor: kConvexGreen,
decoration: BoxDecoration(
color: kConvexGreen.withOpacity(0.1),
borderRadius: BorderRadius.all(Radius.circular(5)),
border: Border.all(
color: kConvexGreen,
width: 2,
),
),
confirmText: Text(
'Submit',
style: TextStyle(color: Colors.white),
),
cancelText: Text(
'Cancel',
style: TextStyle(color: Colors.white),
),
searchable: true,
buttonText: Text("Loss Feeds"),
onSelectionChanged: (results) {
**print(results)**;
},
onConfirm: (results) {
// this is different than what example shows; without cast it errors
// "A value of type 'List<Object?>' can't be assigned to a variable of type 'List<Analysis>'". (Documentation)
_selectedAnalyses = results.cast();
},
chipDisplay: MultiSelectChipDisplay(
chipColor: kConvexGreen,
textStyle: TextStyle(color: Colors.white),
onTap: (value) {
setState(() {
_selectedAnalyses.remove(value);
// crashes here even though both are of same type List<Analyses> (theoretically)
// this is just here for testing purposes as am through many iterations trying to get
// data into lossFeed.
outwardsData.outwards[widget.index].lossFeed =
_selectedAnalyses;
});
},
),
),

Answer 1

I'm sure a more experienced flutter person will understand this (maybe) but I found that I couldn't just have the initial values come from the same list type used for the item (List< Analysis> _analyses) but I actually had to map it to use the same items data (_analyses).
initialValue: outwardsData.outwards[widget.index].lossFeed.map((analysis) => _analyses[analysis.id - 1]).toList()
Had other problems with this widget such as I found I couldn't map the results from onConfirm directly to List but instead had to do the following:
_rData.lossFeed = results.toList().cast<Analysis>()
as the data came back as List< dynamic>.
Couldn't find great examples online and trust experience will be the cure-all at some point.