Aditya Bansal 872e8c1d7b test_fixtures: Fix bug with run_db_migrations for test platform. ...

In this commit we are fixing a kinda serious un-noticed bug with
the way run_db_migrations worked for test db.
Basically run_db_migrations runs new migrations on db (dev or test).
When we talk about the dev platform this process is straight forward.
We have a single DB zulip which was once created and now has some data.
Introduction of new migration causes a schema change or does something
else but bottom line being we just migrate the zulip DB and stuff works
fine.

Now coming to zulip test db (zulip_test) situation is a bit complex
in comparision to dev db. Basically this is because we make use of
what we call zulip_test_template to make test fixture restoration
after tests run fast. Now before we introduced the performance
optimisation of just doing migrations when possible, introduction of
a migration would ideally result in provisioning do a full rebuild of
the test database. When that used to happen sequence of events used to
be something like this:
* Create a zulip_test db from zulip_test_base template (An absolute
basic schema holding)
* Migrate and populate the zulip_test db.
* Create/Re-create zulip_test_template from the latest zulip_test.

Now after we introduced just do migrations instead of full db rebuild
when possible, what used to happen was that zulip_test db got
successfully migrated but when test suites would run they would try to
create zulip_test from zulip_test_template (so that individual tests
don't affect each other on db level).
This is where the problem resides; zulip_test_template wasn't migrated
and we just scrapped zulip_test and re-created it using
zulip_test_template as a template and hence zulip_test will not hold the
latest schema.

This is what we fix in this commit.

2018-07-09 14:17:53 +05:30

7.8 KiB

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