“The operator '[]' isn't defined” error when using .data[] in flutter firestore

Question

I am learning to use firestore in flutter following Net Ninja\'s tutorial on youtube. After user authenticatin was done this guy added user records to the database whenever

Answer 1

Firestore's data used to be a property of QueryDocumentSnapshot, but now it is a function, data().

And, as the error message suggests, what you are dealing with is indeed a Map Function(), i.e. a function that returns a map.

So, simply add empty parentheses to call the function data:

doc.data()['name']