#24543: Add checks / command options for "migrations not applied" and
"migrations
needed"
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Reporter: blueyed | Owner:
Type: New feature | Status: new
Component: Migrations | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by shaib):
This feature request would be useful, IMO, if there were easy ways to tell
destructive migrations apart from non-destructive, and/or run only non-
destructive ones. However, as migrations are not built to support these
notions, this is a rather big "if".
This is a little academic, but (Replying to [comment:6 MarkusH]):
> Furthermore, you can't reply on `MAX(id)`. If you roll-back a migration
the item is removed from the table and e.g. Postgres doesn't reset the
sequence.
... this means you can't trust `MAX(id)` to tell you the id of the first
migration to be applied. On Postgres It is still true, though, AFAIK, that
all future migrations will be recorded with larger ids. On Oracle
`MAX(id)` really cannot be trusted, because of sequence value caching
(that is, the next value retrieved from a sequence is only guaranteed to
be larger than all previous ones retrieved on the same connection).
--
Ticket URL: <https://code.djangoproject.com/ticket/24543#comment:7>
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