The property 'docs' can't be unconditionally accessed because the reciever can be 'null'

Question

When I use this code:

return FutureBuilder(
  future: searchResultsFuture,
  builder: (context, snapshot) {
    if (!snapshot.hasData) {
      return cargandoCircular();
    }

    List<UserResult> searchResults = [];
    snapshot.data.docs.forEach((doc) {
      User user = User.fromDocument(doc);
      UserResult searchResult = UserResult(user);
      searchResults.add(searchResult);
    });
 return ListView(
      children: searchResults,
    );

I get the error:

The property 'docs' can't be unconditionally accessed because the receiver can be 'null'.
Try making the access conditional (using '?.') or adding a null check to the target ('!').

Adding the null check doesn't solve anything, also everything is declared in a User class on another dart file, like this:

class User {
final String id;
final String username;
final String email;
final String photoUrl;
final String displayName;
final String bio;

User(
  {required this.id,
  required this.username,
  required this.email,
  required this.photoUrl,
  required this.displayName,
  required this.bio});

factory User.fromDocument(DocumentSnapshot doc) {
return User(
  id: doc['id'],
  email: doc['email'],
  username: doc['username'],
  photoUrl: doc['photoUrl'],
  displayName: doc['displayName'],
  bio: doc['bio'],
);}}

add a ! to snapshot.data.docs.forEach((doc): snapshot.data!.docs.forEach((doc) — Sajad Abdollahi, Jul 11 '21 at 20:13
I clarified in the question that adding the null check didn't solve anything. — , Jul 11 '21 at 20:22
Does this answer your question? [The property 'docs' cannot be unconditionally accessed because received can be 'null' Flutter](https://stackoverflow.com/questions/66670247/the-property-docs-cannot-be-unconditionally-accessed-because-received-can-be) — Pit, Jul 12 '21 at 07:22
I added the type to the FutureBuilder, and the ? on snapshot.data, and it solves the error in vs code but it doesn't do anything on the app. — , Jul 12 '21 at 11:07

score 1 · Answer 1 · answered Jul 12 '21 at 02:51

1

access it using this:

snapshot.data?.docs

since the data from snapshot can be null and that is why we check in future builder for whether snapshot.hasData is true or not.

answered Jul 12 '21 at 02:51

Nandan Wewhare

445
5
11

When I add the ? it throws this error: The getter 'docs' isn't defined for the type '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'. – Jul 12 '21 at 10:40
Try snapshot?.data.docs – Nandan Wewhare Jul 12 '21 at 11:37

The property 'docs' can't be unconditionally accessed because the reciever can be 'null'

1 Answers1