#24870: Create --update flag for makemigrations management command, mimicking
South's one.
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Reporter: dukebody | Owner: nobody
Type: New feature | Status: new
Component: Migrations | Version: 1.8
Severity: Normal | Resolution:
Keywords: migrations, south | 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 andrewgodwin):
It's certainly possible, though more complicated than before in South
because of the multi-app nature of makemigrations - but also easier
because of the ease of programatically parsing and writing migration
files.
What this would be, in essence, is something that runs makemigrations and
glues the first migration it makes for each app to the most recent one
that already exists. The pain points I forsee are:
* Migration files that have custom code (RunPython especially, but also
any non-standard operation class) cannot be round-tripped through the
parser and then out through the writer, so they could not be appended
onto.
* Dependencies would have to be checked to make sure this merging of the
new migrations into old does not cause dependency loops.
* It will occasionally have to just make new migrations anyway - it's more
asking for a "best effort" attempt to make things work.
That said, I think it's not too complicated, and shares enough of these
challenges with squashing (it's basically squashing the new migrations
makemigrations creates into the last ones of the existing set), that we
should aim to do it at some point.
--
Ticket URL: <https://code.djangoproject.com/ticket/24870#comment:2>
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