refs https://github.com/TryGhost/Team/issues/1248
This is the underlying cause of the problems we've seen whilst handling
Stripe webhooks. A transaction ensures that the operations are atomic,
but not that they can run concurrently.
If you have some code which does this, concurrently:
1. Starts a transaction
2. Reads a value
3. Changes the values
4. Ends the transaction
Without applying the `FOR UPDATE` lock - you will have both sequenes
read the same value at step 2.
With the `FOR UPDATE` lock - one of the sequences will hang at step 2,
waiting for the other transaction to end, at which point it will resume
and read the _changed_ value.
Because the `edit` method explicitly does a read followed by a write, we
have also add the `FOR UPDATE` lock to this by default, to avoid any race
conditions. This does however require that `edit` is called within a
transaction. An issue here https://github.com/TryGhost/Team/issues/1503
considers running in a transaction by default.
- this is a small part of a bit of cleanup of our test files
- the goal is to make the existing tests clearer with a view to making it easier to write more tests
- this makes the test structure follow the codebase structure more closely
- eventually we will colocate the tests as we break the codebase down further
2021-10-06 12:01:09 +01:00
Renamed from test/unit/models/base/crud.test.js (Browse further)
