Fixed issue where radio group not submitting value

Author: danvick

lib/src/fields/form_builder_radio_group.dart

@@ -56,14 +56,15 @@ class FormBuilderRadioGroup<T> extends FormBuilderField<T> {
             return InputDecorator(
               decoration: decoration.copyWith(
                 enabled: !state.readOnly,
-                errorText: decoration?.errorText ?? field.errorText,
+                errorText: decoration?.errorText ?? state.errorText,
               ),
               child: GroupedRadio(
                 orientation: orientation,
                 value: initialValue,
                 options: options,
                 onChanged: (val) {
-                  field.didChange(val);
+                  state.requestFocus();
+                  state.didChange(val);
                 },
                 activeColor: activeColor,
                 focusColor: focusColor,

lib/src/widgets/grouped_radio.dart

@@ -20,7 +20,7 @@ class GroupedRadio<T> extends StatefulWidget {
   final GroupedRadioOrientation orientation;
 
   /// Called when the value of the checkbox group changes.
-  final ValueChanged<List<T>> onChanged;
+  final ValueChanged<T> onChanged;
 
   /// The color to use when this checkbox is checked.
   ///
@@ -264,6 +264,7 @@ class _GroupedRadioState<T> extends State<GroupedRadio<T>> {
               setState(() {
                 selectedValue = selected;
               });
+              widget.onChanged?.call(selectedValue);
             },
     );
 
@@ -276,6 +277,7 @@ class _GroupedRadioState<T> extends State<GroupedRadio<T>> {
               setState(() {
                 selectedValue = widget.options[index].value;
               });
+              widget.onChanged?.call(selectedValue);
             },
     );