Ypy is deprecated and unmaintained. We have problem with parsing
existing documents. We replace it by pycrdt, library actively maintained
and without the issues we have with Ypy.
We took this opportunity to refactor the way access is controlled on
media attachments. We now add the media key to a list on the document
instance each time a media is uploaded to a document. This list is
passed along when a document is duplicated, allowing us to grant
access to readers on the new document, even if they don't have or
lost access to the original document.
We also propose an option to reproduce the same access rights on the
duplicate document as what was in place on the original document.
This can be requested by passing the "with_accesses=true" option in
the query string.
The tricky point is that we need to extract attachment keys from the
existing documents and set them on the new "attachments" field that is
now used to track access rights on media files.
Migration tests should not import and use factories or models
directly from the code because they would not be in sync with
the database in the state that each state needs to test it.
Instead the migrator object passed as argument allows us to
retrieve a minimal version of the models in sync with the state
of the database that we are testing. What we get is a minimal
model and we need to simulate all the methods that we could have
on the real model and that are needed for testing.
The frontend was setting a default titles for
documents with empty titles.
This migration updates the document table to set
the title to null instead of the default title.
We add a test to ensure that the migration
works as expected.
