Question 79468 in Flutter Question posted in
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How to run transaction in cloud_firestore_odm? – Flutter

I want to run a transaction to update data in the Cloud Firestore using cloud_firestore_odm.

This code works fine:

usersRef 
  .doc('foo_id')
  .update(
    name: 'John',
  );

But this one doesn’t. I’m doing something wrong, can anyone tell me how to properly do it?

final transaction = await FirebaseFirestore.instance.runTransaction((_) async => _);

usersRef 
  .doc('foo_id')
  .transactionUpdate(
    transaction,
    name: 'John',
  );
Tags:

2

Answers


  1. 0

    Try this:

    await FirebaseFirestore.instance((transaction) async {
   await transaction.update(usersRef.doc('foo_id'),{
     'name' : 'John'
   });
});
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  2. 0

    Due to how the ODM works, the syntax for using transactions using the Firestore ODM is slightly different.

    Instead of:

    await FirebaseFirestore.instance.runTransaction((transaction) async {
  transaction.update(usersRef.doc('id'), {'age': 42});  
});

    You should do:

    await FirebaseFirestore.instance.runTransaction((transaction) async {
  usersRef.doc('id').transactionUpdate(transaction, age: 42);  
});

    Basically, the transaction vs "reference" are swapped. But as a benefit, the transaction object is fully typed.

    The same logic applies for any other transaction method.

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