CODEWITHSUNDEEP
functionflutterdartgoogle-cloud-firestoredeprecated
Michael
Michael

Reputation: 471

Flutter/cloud_firestore: The operator '[]' isn't defined for the type Map <String, dynamic> Function()

I updated my Firestore package and I am getting this error ("The operator '[]' isn't defined for the type Map <String, dynamic> Function()"). I saw that there in another post about the same error here, but in my case, I am unsure how to make the changes so I am starting a new thread with my code. Can anyone show me how to make the changes, please? The error is showing up in the code below at List categories = document.data['listCategories'] ?? [];

                          TextFormField(
                            controller: _catController,
                            obscureText: false,
                            autocorrect: false,
                            onChanged: (value) {},
                            decoration: InputDecoration(
                              labelText: 'Add a new category here',
                              labelStyle: TextStyle(
                                  color: Theme.of(context).primaryColor),
                              border: OutlineInputBorder(
                                borderRadius: BorderRadius.circular(5.0),
                              ),
                              focusedBorder: OutlineInputBorder(
                                borderSide: BorderSide(
                                    width: 2,
                                    color: Theme.of(context).primaryColor),
                              ),
                              suffixIcon: IconButton(
                                icon: Icon(
                                  // Based on passwordVisible state choose the icon
                                  Icons.add,
                                  color: Theme.of(context).primaryColor,
                                ),
                                onPressed: () async {
                                  final String name = _catController.text;
                                  DocumentReference docRef =
                                      userCollection.doc(_uid);
                                  DocumentSnapshot document = await docRef.get();
                                  List categories =
                                      document.data['listCategories'] ?? []; // <-- ERROR 
                                  if (categories.contains(name) == true) {
                                    setState(() {
                                      _errorMessage =
                                          '$name has already been added';
                                    });
                                  } else {
                                    userCollection.doc(_uid).update({
                                      'listCategories':
                                          FieldValue.arrayUnion([name])
                                    });
                                    _catController.text = '';
                                    setState(() {
                                      _errorMessage = '';
                                    });
                                  }
                                },
                              ),
                            ),
                            autovalidateMode: AutovalidateMode.always,
                            cursorColor: Theme.of(context).primaryColor,
                            maxLines: 1,
                          ),

Upvotes: 0

Views: 1500

Answers (1)

kovalyovi
kovalyovi

Reputation: 1039

This error The operator '[]' isn't defined for the type Map <String, dynamic> Function() tells you that the object you are trying to do the [] operator on is a function. In your case, .data is actually not a member variable but a function. It is solved by just adding () next to the data keyword, so your error line (fixed) would look like that:

document.data()['listCategories'] ?? [];

That might've happened because you updated the firebase core package. It used to be just .data[] but now it's .data()[].

Upvotes: 2

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