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Fix prioritized community sort #1015

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merged 3 commits into from
Jan 5, 2024
Merged

Fix prioritized community sort #1015

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0a3e3bc
Fix prioritized community sort
micahmo Jan 5, 2024
60d7294
Merge remote-tracking branch 'upstream/develop' into fix/community-sort
micahmo Jan 5, 2024
3668f08
Simplify sorting algorithm
micahmo Jan 5, 2024
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26 changes: 17 additions & 9 deletions lib/feed/utils/community.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -77,14 +77,22 @@ Future<void> toggleFavoriteCommunity(BuildContext context, Community community,
}

/// Takes a list of [communities] and returns the list with any [favoriteCommunities] at the beginning of the list
/// Note that you may need to call [toList] on any lists that are marked as readonly.
/// Note that you may need to call [toList] when passing in lists that are marked as readonly.
List<CommunityView>? prioritizeFavorites(List<CommunityView>? communities, List<CommunityView>? favoriteCommunities) {
return communities
?..sort(
(a, b) => favoriteCommunities?.any((c) => c.community.id == a.community.id) == true
? -1
: favoriteCommunities?.any((c) => c.community.id == b.community.id) == true
? 1
: b.counts.subscribers.compareTo(a.counts.subscribers),
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This was the problematic line from before. 😊

);
// If either communities or favorites are empty, no reason to prioritize.
if (communities?.isNotEmpty != true || favoriteCommunities?.isNotEmpty != true) {
return communities;
}

// Create a set of the favorited community ids for filtering later
Set<int> favoriteCommunityIds = Set<int>.from(favoriteCommunities!.map((c) => c.community.id));

// Filters out communities that are part of the favorites, and keeps the same order
List<CommunityView>? sortedFavorites = communities!.where((c) => favoriteCommunityIds.contains(c.community.id)).toList();

// Filters out communities that are not a part of the favorites, and keeps the same order
List<CommunityView>? sortedNonFavorites = communities.where((c) => !favoriteCommunityIds.contains(c.community.id)).toList();

// Combine them together, with favorites at the top
return List<CommunityView>.from(sortedFavorites)..addAll(sortedNonFavorites);
}
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