The getter 'docs' isn't defined for the type 'AsyncSnapshot<Object?>'

Question

After migrating to null safety getting error The getter 'docs' isn't defined for the type 'AsyncSnapshot<Object?>'. Try importing the library that defines 'docs', correcting the name to the name of an existing getter, or defining a getter or field named 'docs'.

Code snippet where error is

    return FutureBuilder(
      future: searchResultsFuture,
      builder: (context, snapshot) {
        if (!snapshot.hasData) {
          return circularProgress();
        }
        List<UserResult> searchResults = [];
        snapshot.docs.forEach((doc) {    //have error here
          User user = User.fromDocument(doc);
          UserResult searchResult = UserResult(user);
          searchResults.add(searchResult);
        });
        return ListView(
          children: searchResults,
        );
      },
    );
  } 

searchResultsFuture

  handleSearch(String query) {
    Future<QuerySnapshot> users =
        usersRef.where("displayName", isGreaterThanOrEqualTo: query).get();
    setState(() {
      searchResultsFuture = users;
    });
  }

  clearSearch() {
    searchController.clear();
  }

Solution 1

The snapshot in your code is an AsyncSnapshot, which indeed doesn't have a docs child. To get the docs from Firestore, you need to use:

snapshot.data.docs

Also see the FlutterFire documentation on listening for realtime data, which contains an example showing this - and my answer here explaining all snapshot types: What is the difference between existing types of snapshots in Firebase?

Solution 2

change like this:

return FutureBuilder(
      future: searchResultsFuture,
      builder: (context, **AsyncSnapshot** snapshot) {
        if (!snapshot.hasData) {
          return circularProgress();
        }
        List<UserResult> searchResults = [];
        **snapshot.data!.docs.forEach((doc) {** 
          User user = User.fromDocument(doc);
          UserResult searchResult = UserResult(user);
          searchResults.add(searchResult);
        });
        return ListView(
          children: searchResults,
        );
      },
    );
  }

Comments

[pskink]

"The getter 'docs' isn't defined for the type 'AsyncSnapshot<Object?>" - yes indeed AsyncSnapschot does not have a field called docs

[Maldives Hunt]

so what do i have to do to fix my code?

[pskink]

use AsyncSnapshot.data property

[Maldives Hunt]

@pskink can you please tell how i can use AsyncSnapshot.data property here

[pskink]

what do you see if you call print(snapshot.data)? if it is not null then it has your data

[Maldives Hunt]

it is null what change do I have to get data with my code?

[pskink]

add print(snapshot) then - it seems that error is set

[Maldives Hunt]

AsyncSnapshot<QuerySnapshot<Object?>>(ConnectionState.done, Instance of '_JsonQuerySnapshot', null, null)

[pskink]

so it is not null - it is _JsonQuerySnapshot which is a concrete implementation of QuerySnapshot class

[Maldives Hunt]

so how do i display my data?

[Maldives Hunt]

tried this but it does not fix my issue, still getting the same error, i have started getting this error only after migrating to null safety

[Maldives Hunt]

Thank you for providing those information's, but still i haven't being able to fix my code I'm very new to flutter and don't know much on using these code, I'm just trying to learn them

[Frank van Puffelen]

I gathered as much, which is why I provided two links where you can find a deeper explanation and more example code. If you're having trouble making those work, edit your question to show what you've tried with the information/code from the answer and links.

[tjheslin1]

Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.