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Management command to delete batch of users #915

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@lunika lunika commented Aug 23, 2024

Purpose

In the Mork project, a redis set will be defined with a list of user to
delete using there username. Joanie is then responsible to do this
deletion in batch. For this, we created a management command, reading
the set in redis and then triggering the user deletion in a celery task.

Proposal

  • use settings.AUTH_USER_MODEL and change deletion to cascade
  • create a management command to bulk delete users

New order states are needed for the new sales tunnel:
- ORDER_STATE_ASSIGNED
- ORDER_STATE_TO_SAVE_PAYMENT_METHOD
- ORDER_STATE_TO_SIGN
- ORDER_STATE_TO_SIGN_AND_TO_SAVE_PAYMENT_METHOD
With the new sale tunnel, we need to assign an organization directly on
order creation.
As order submit endpoint will be removed, we set ProductTargetCourseRelation
directly on order creation.
As a main invoice is created at the first payment scgedule installment,
we create it at order creation, and use it to store the billing address.
We want to store the chosen credit card in an order, and use it to
trigger scheduled payments.
As pending order state will be deleted, the abort endpoint will be
useless.
As payment process is being rewritten, the submit endpoint will be
useless.
As validate order state will be deleted, the validate endpoint will be
useless.
As the submit transition will be removed, the code executed in it is
removed, and the tests are accordingly modified.
As the validated order state will not be used anymore, its usage has
been removed.
As order.submit content has been removed, we can delete it.
As some order flows has been removed, we can delete them.
As the unused states have been removed, we have to add a database
migration to replace them.

Strings are used here to allow us to delete them from our enums module.
Pending order state transition will not be used anymore.
Validated order state is not used anymore.
Submitted state is not used anymore.
A test (probably randomized somewhere) was missing an object database
refresh.
As we now have many test which contains asserts in loop, using subtests
allows to continue the test to run, even if one of the assert fails.
This test was wrong with our new states.
Subtest usage is introduced here.

Also reverse path usage has been replaced by real path.
To ensure all cases are tested, even if one fails, subtest is added.
Order conditions and transitions were grouped by type.
They are now grouped by usage, which make the code easier to read.
Order state pending transition was missing source targets.
We can actually go from assigned, to_sign, to_save_payment_method, and
to_sign_and_to_save_payment_method to pending.
Order state _post_transition_success was missing source states to create
an enrollment.
Many things needs to be done before using the new states.
Each of them are noted as TODO.
Contracts returned by the GenericContractViewSet queryset needs to be
updated with the new state.
As TODOs are used temporarily, CI linting needs to ignore them.
Also, convenient make tasks have been added.
As a test needs unique email generated, those provided by faker may
collide.
As states changed, an error message needed to be updated accordingly.
Orders returned by the NestedOrderCourseViewSet queryset needs to be
updated with the new state.
As states changed, an error message needed to be updated accordingly.
jonathanreveille and others added 11 commits August 21, 2024 14:26
For every installment paid in a payment schedule, we
trigger an email with the information about the last
payment done. We needed to prepare a new MJML template
for the email that is sent to the user.
When all installments are paid on the order's payment
schedule, we needed to prepare a new MJML template for the
email that is sent to the user summarizing all the
installments paid and also confirming that the user has
successfully paid every step on the payment schedule.
To ease the life of our fellow developers, we have created a debug
view to see the layout and how the email is rendered for
installment payment that are paid.
To ease the life of our fellow developers, we have created a debug
view to see the layout and how the email is rendered for
when all the installments are paid on the payment schedule
for the user.
Once an installment is paid, we now send an email
with the data on the payment made by the user.
There are 2 different email templates, one is used
when 1 installment is paid, an the other template
is used when all the installments are paid on the
payment schedule.

Fix #862
On enrollment order resource, our api consumer needs to be able to retrieve
payment schedule information so we update the OrderLightSerializer to add this
field.
When an installment debit has failed in a payment schedule,
we trigger an email with the information. First, we need
to create a new MJML template for this situation.
For our fellow developers, we have created a debug view
to checkout the layout and the rendering of the email
that is sent when an installment has failed to be debited.
Once an installment debit has been refused, we send an email
with the data about the failed payment in the payment
schedule of the order.

Fix #863
We need to change relation with the user model to delete them when a
user is deleted. For this, the on_delete for the ForeignKey is changed
to CASCADE. To be really used, we also need to stop using the User model
directly but instead use the settings AUTH_USER_MODEL as explain in the
django documentation.
In the Mork project, a redis set will be defined with a list of user to
delete using there usename. Joanie is then responsible to do this
deletion in batch. For this, we created a management command, reading
the set in redis and then triggering the user deletion in a celery task.
self.assertEqual(payment_models.Invoice.objects.count(), 0)
self.assertFalse(models.Address.objects.filter(owner=user).exists())
self.assertLogsContains(logger, "User test_user has been deleted.")

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@jonathanreveille jonathanreveille Aug 23, 2024

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IMO, what about creating other objects where you have changed the on_delete property in their models to cascade that are referencing a Foreign Key of User ?
It's just an idea, maybe we could create other related objects such as : CourseAccess, CourseWish, IssuedBadge, and ActivityLog and make sure that they are also deleted in cascade.

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Everything seems good to me already 👌, just small typos to fix.
Maybe add the missing models into some tests just to make sure that everything is deleted in cascade as expected.

Might need to add an entry into the CHANGELOG about this new command.

delete_user("test_user")

self.assertFalse(get_user_model().objects.filter(username="test_user").exists())
self.assertEqual(models.Order.objects.count(), 0)
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Do we really want to delete orders ?

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@jonathanreveille jonathanreveille Aug 23, 2024

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Good catch, propably the Invoice and Transaction should stay as well to keep the sales records ? And just anonymize the data related to the user that are linked to the Order ?

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4 participants