Question 78116 in Flutter Question posted in
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Flutter :Cannot read properties of undefined (reading 'id') while accessing document id from cloud firestore

I am trying to get the document id of my collection "blogs" in firebase . I tried to access it using id method but it is showing an error Cannot read properties of undefined (reading 'id').How can I access the document id?

this is how I tried to print the document id print(docRef.id); but getting the error .What’s wrong with my code?

DocumentReference docRef =
                            await FirebaseFirestore.instance
                                .collection('blogs')
                                .add({
                                  'title': titleController.text,
                                  'body': myController.text,
                                  'author': name,
                                 
                                  'date': DateFormat('dd/MM/yyyy,hh:mm')
                                      .format(DateTime.now()),
                                })
                                .then((value) => successAlert(context))
                                .catchError((error) => errorAlert(context));

                       print(docRef.id);

                        titleController.clear();
                        myController.clear();
                      }
Tags:

2

Answers


  1. 0

    well, while you’re using then, try this instead :

                                await FirebaseFirestore.instance
                                .collection('blogs')
                                .add({
                                  'title': titleController.text,
                                  'body': myController.text,
                                  'author': name,
                                 
                                  'date': DateFormat('dd/MM/yyyy,hh:mm')
                                      .format(DateTime.now()),
                                })
                             .then((value) {
                             print(value.id); // do it here
                             successAlert(context);
                             })
                                .catchError((error) => errorAlert(context));
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  2. 0

    If you want to get the data after FirebaseFirestore method you need to use this approach instead of using then method:

    DocumentReference docRef = await FirebaseFirestore.instance .collection('blogs').add({
    'title': titleController.text,
    'body': myController.text,
    'author': name,
    'date': DateFormat('dd/MM/yyyy,hh:mm').format(DateTime.now()),})
   .catchError((error) => errorAlert(context));

successAlert(context)
print(docRef.id);
titleController.clear();
myController.clear();

    when you use then to get an async value you only get that result inside then and can’t access it after then.

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