[feature] custom onSave implementation

Hey!

Is there a way to define custom callback when data is saved/updated?

Consider a situation when a collection or document are read-only, write operations can be only done server-side.

read: true;
write: false;

onSaveSuccess and onPreSave are hooks around client-side save operation.

For example, custom save operation would let us perform calls to an API to update data.

Something like this defined on Schema maybe?

onSave = async ({ newValues }) => {
  await updateData(...)
  // if throws - display snackbar
    
  return newValues;
};

[fgatti675]

Quick update in case someone is interested. We are currently working on a way to override the complete datasource implementation, allowing you to add your custom logic and even replace the whole Firestore implementation for a different one.

[shelooks16]

Thanks for letting me know! Gonna keep an eye on this 😃