Question 79836 in Flutter Question posted in
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Unable to emit same state when new data gets added using equatable in flutter bloc

I am trying to emit same state with different set of data using equatable. But, somehow the state doesn’t get emitted the second time when next 5 records are added in the list.

It would be great if someone could help.

This is how I am emitting post:

loadedState = LoadedPosts(
                      now: DateTime.now(),
                      post: List.from(postDetailsFilteredPostResponse, growable: false),
                          newCount: 0,
                          friends: List.from(postFriendsResponse, growable: false),
                          likes: List.from(postLikesResponse, growable: false),
                          comments:List.from(postCommentsResponse, growable: false),
                          photos: List.from(postPhotosResponse, growable: false),
                          userDetail: userDetail);

emit(loadedState);

This is the state class:

 abstract class PostState extends Equatable{
    @override
    List<Object?> get props => [];
}
class LoadedPosts extends PostState{
  List<Post> post = List<Post>.filled(5, Post(postId: ''));
  final List<User>? friends;
  final List<Images> photos;
  final List<UserLikes> likes;
  final List<UserComments> comments;
  final User? userDetail;
  final int newCount;
  final DateTime now;


  LoadedPosts({
    required this.post,
    required this.friends,
    required this.photos,
    required this. likes,
    required this.comments,
    required this.newCount,
    required this.now,
    this.userDetail });
 

  @override
  List<Object?> get props => [now, post];
}
Tags:

2

Answers


  1. 0

    Make all the lists growable: false in your state class. So when you are creating a state object, pass the list as follows.

    List.from([1,2,3], growable: false);

    now, you won’t be able to add any elements to same list object. Every time, you will have to do List.from([...oldList, ...newItems], growable:false);

    This will make sure your data is immutable and state is emitted.

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  2. 0

    Change your Model as below, have your timestamp as int and assign unique timestamp value ( Mili-seconds ) every-time when you emit.

    abstract class PostState extends Equatable {
    @override
    List<Object?> get props => [];
} 

class LoadedPosts extends PostState {
    final List<Post> post;
    final List<User>? friends;
    final List<Images> photos;
    final List<UserLikes> likes;
    final List<UserComments> comments;
    final User? userDetail;
    final int newCount;
    final int now; // have this as ( int )


LoadedPosts({
    required this.post,
    required this.friends,
    required this.photos,
    required this. likes,
    required this.comments,
    required this.newCount,
    required this.now,
    this.userDetail });


    @override
    List<Object?> get props => [now, post];
}

    Have the value like this:

    LoadedPosts(now: DateTime.now().millisecondsSinceEpoch, ...);
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