#15068: initial_data fixtures using natural keys fail in tests with multiple
databases
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Reporter: dcramer | Owner: nobody
Status: closed | Milestone:
Component: Testing framework | Version: 1.2
Resolution: invalid | Keywords:
Stage: Accepted | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Comment (by dcramer):
Natural keys require the data to exist in the database before they're
referenced. With the way fixtures work, they're instantiated before
running the "allow_syncdb" check. In our case, a database with the name
"analytics" was loaded before "default", which contains very few tables.
When it gets around to a fixture with a natural key, it attempts to
instantiate it using the natural key code path, which attempts to validate
a foreign key against a table that does not exist. I'm pretty certain this
is valid, and while it may be an edge case (not sure how common natural
key usage is), it's certainly very odd behavior.
I attempted to shift loading fixtures after syncdb was done (on every
database), but that still doesnt solve it, as the fixtures load per
database (not globally), and in this case, they still have the same issue.
I think the proper fix would be to change natural keys so they're mapped
in memory, but that requires quite a large change to Django itself I
imagine, as last I knew relationships dont support associations if they
dont have an identifier, which these wouldn't.
--
Ticket URL: <http://code.djangoproject.com/ticket/15068#comment:3>
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