#30966: Migration crashes due to foreign key issue, depending on otherwise
irrelevant order on MySQL.
-------------------------------------+-------------------------------------
Reporter: Peter Thomassen | Owner: Hasan
| Ramezani
Type: Bug | Status: assigned
Component: Migrations | Version: master
Severity: Normal | Resolution:
Keywords: migration mySQL | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
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Comment (by Peter Thomassen):
Replying to [comment:13 Markus Holtermann]:
> 4. Leave as-is; the first migration can be optimized anyway
The first migration can trivially be optimized in this minimum example. In
our real example, we encountered the problem where migration 0003
interferes with migration 0011, with existing deployments somewhere in the
middle.
In that case, 0003 and 0011 can be optimized/squashed more or less easily
for new deployments, but migration 0011 would have to be maintained
individually for those deployments which already have all migrations up to
that one applied. The result would be code duplication for "fresh" and
"existing" deployments, and -- if this problem reoccurs -- maybe even more
"squashed migration variations".
So far, squashing was optional, and it would become a mandatory mechanism,
while producing code duplication in cases as described above. In my
opinion, that would be the least favorable option.
Thanks a LOT for your time, and for thinking though this whole thing!
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Ticket URL: <https://code.djangoproject.com/ticket/30966#comment:15>
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