Linked rows with buffered changes cannot be serialized

Bug Reports
1

What I’m trying to do:
Save a row(model) that has a link to another table, using buffered=True with model classes. I have a phase row that has parent=row_from_project_table.

What I’ve tried and what’s not working:
phase = Phase()
project.save()
phase.parent = project
phase.save()

This actually works (I checked the db), but I guess returning the value from the server, this happens:

anvil.server.SerializationError: Cannot serialize return value from function. Linked Rows with buffered changes cannot be serialized. Call save() or reset() first, (Found <project_estimator.models.project.Project object>)

I don’t have this issue with buffered=False. But then I don’t get the advantages of using buffered changes with writeback bindings and one save() call.

2

can you create a minimal example so we can take a look

thanks

3

My _do_create in Phase was changing stuff for the parent… that’s the cause of the issue. I’m not sure how to get around that since when I write save inside of a _do_create, I get another error saying I’m already in a transaction. See minimal example:

4

thanks we’ll take a look

It does look like the call to .save() is necessary here, within your _do_create
so we’ll see if we can get that working without the transaction issues

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