如何在 Cloud Firestore 中编辑文档中的密钥对？

Question

I want to edit the following key pair in Cloud Firestore:

For this I created a button that calls the following function:

void select(key) {
    if (key == 'Stufe 1') {
      stufenService.editStufe('Stufe', 1);
    }
    if (key == 'Stufe 2') {
      stufenService.editStufe('Stufe', 2);
    }
    if (key == 'Stufe 3') {
      stufenService.editStufe('Stufe', 3);
    }
    if (key == 'Stufe 4') {
      stufenService.editStufe('Stufe', 4);
    }
    if (key == 'Stufe 5') {
      stufenService.editStufe('Stufe', 5);
    }
    if (key == 'Stufe 6') {
      stufenService.editStufe('Stufe', 6);
    } print(key);
  }

This is the exact code of stufenService.editStufe(String, int):

final CollectionReference userTodos =

FirebaseFirestore.instance.collection('userTodos');
  
  Future editStufe(String Stufe, int i) async{
    return await userTodos.doc(userID).update({Stufe: i});
  }
}

When I press the button that calls 'select', only the key is printed in the console. Nothing changes in Cloud Firestore. I think the mistake is somewhere here:

final CollectionReference userTodos =

FirebaseFirestore.instance.collection('userTodos');

  Future editStufe(String Stufe, int i) async{
    return await userTodos.doc(userID).update({Stufe: i});
  }
}

I hope I have provided all the necessary data so that the problem can be solved. If not, just write it to me and I will try to send you the material you need.

Answer 1

While reviewing google and external documentation, you could use the following code example to update your key pair on Cloud Firestore :

This is an example code of how to update your key pair using ' update ':

const usuariosRef = db.collection(‘userTodos’);

//userTodosRef.doc(‘ID’)

userTodosRef
    .doc(‘81Acc0wgLegYMSTTrCWLRQhzjA2’)
    .update({
          stufe = 1
    });


This is an example code of how to update your key pair using ‘`set`’:

const usuariosRef = db.collection(‘userTodos’);

//userTodosRef.doc(‘ID’)

userTodosRef
    .doc(‘81Acc0wgLegYMSTTrCWLRQhzjA2’)
    .set({
          stufe = 1
    });

The difference between both is that 'update' only changes the value you want to update, 'set' deletes all the data and updates it with the value added.

Here is a document that could help you with references you can performed with your data: https://googleapis.dev/nodejs/firestore/latest/DocumentReference.html#update