fix: filter out timeline categories with key null when creating a new one

CHANGELOG.md

@@ -3,6 +3,7 @@
 - Add a serviceBuilder to the userstory configuration
 - Add a listHeaderBuilder for showing a header at the top of the list of posts in the timeline
 - Add a getUserId function to retrieve the userId when needed in the userstory configuration
+- Fix the timelinecategory selection by removing the categories with key null
 
 ## 3.0.1
 

packages/flutter_timeline_view/lib/src/config/timeline_theme.dart

@@ -15,6 +15,7 @@ class TimelineTheme {
     this.sendIcon,
     this.moreIcon,
     this.deleteIcon,
+    this.categorySelectionBorderColor,
     this.textStyles = const TimelineTextStyles(),
   });
 
@@ -38,5 +39,9 @@ class TimelineTheme {
   /// The icon for delete action (delete post)
   final Widget? deleteIcon;
 
+  /// The text style overrides for all the texts in the timeline
   final TimelineTextStyles textStyles;
+
+  /// The color of the border around the category in the selection screen
+  final Color? categorySelectionBorderColor;
 }

packages/flutter_timeline_view/lib/src/screens/timeline_selection_screen.dart

@@ -38,7 +38,7 @@ class TimelineSelectionScreen extends StatelessWidget {
           ),
           const SizedBox(height: 4),
           for (var category in categories.where(
-            (element) => element.canCreate,
+            (element) => element.canCreate && element.key != null,
           )) ...[
             options.categorySelectorButtonBuilder?.call(
                   context,
@@ -55,7 +55,8 @@ class TimelineSelectionScreen extends StatelessWidget {
                     decoration: BoxDecoration(
                       borderRadius: BorderRadius.circular(10),
                       border: Border.all(
-                        color: const Color(0xff71C6D1),
+                        color: options.theme.categorySelectionBorderColor ??
+                            const Color(0xff71C6D1),
                         width: 2,
                       ),
                     ),