Flutter Search Delegate with Firestore

user_11977332 0
Viewed 1805

I m implementing a search feature using Flutter Search Delegate and the data is stored in Firestore. I can't figure out why this error is coming up.

Widget buildSuggestions(BuildContext context) {
  return StreamBuilder(
    stream: Firestore.instance.collection('todos').snapshots(),
    builder: (context, snapshot) {
      if (!snapshot.hasData) return new Text('Loading...');

      final results =
          snapshot.data.documents.where((a) => a['title'].contains(query));

      return ListView(
        children: results.map<Widget>((a) => Text(a['title'])).toList(),
      );
    },
  );
}

Error:

type '(dynamic) => dynamic' is not a subtype of type '(DocumentSnapshot) => bool' of 'test'

google-cloud-firestore dart flutter
2 Answers

Replace the line

final results = snapshot.data.documents.where((a) => a['title'].contains(query));

to 

final results = snapshot.data.documents.where((DocumentSnapshot a) => a.data['title'].contains(query));

And the line 

children: results.map<Widget>((a) => Text(a['title'])).toList()

to 

children: results.map<Widget>((a) => Text(a.data['title'])).toList()
user_103366330

Replace the Line

builder: (context, snapshot) {
  ....

With

builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
.....

Final code be :

 Widget buildSuggestions(BuildContext context) {
    return StreamBuilder(
      stream: FirebaseFirestore.instance.collection('todos').snapshots(),
      builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
        if (!snapshot.hasData) return new Text('Loading...');

        final results =
            snapshot.data.docs.where((a) => a['title'].contains(query));

        return ListView(
          children: results.map<Widget>((a) => Text(a['title'])).toList(),
        );
      },
    );
  }
user_143829730
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