Add an --unapplied option for showmigrations

[Sky Christensen]

I'd like to be able to easily see a list of only unapplied migrations.

I often find myself switching to a new branch and wanting to quickly
find out whether it contains any migrations that are yet to be applied
to my development database, and what they are.

At the moment I use a plain `./manage.py showmigrations`, but when there
are lots of migrations, scanning the resulting list to find out which --
if any -- migrations are not yet applied is tedious and error-prone.

I'd really like to be able to do something like `./manage.py
showmigrations --unapplied` or `./manage.py showmigrations -u`, and have
that produce a list of only the unapplied migrations.

I'll be happy to open a ticket and submit a patch to do this if others
think the idea has merit.

[Adam Johnson]

I think you want "manage.py migrate --plan" - new in Django 2.2 https://docs.djangoproject.com/en/2.2/ref/django-admin/#cmdoption-migrate-plan

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Adam

[Sky Christensen]

Thanks Adam - I hadn't come across that, and think it's what I'm after.

Would it be worth adding a note about this to the "showmigrations"
section of the docs? It strikes me that that's the place people would
look for an answer to the question "How can I see a list of just the
unapplied migrations?".

It could be quite a short note. Something like "To show only the
unapplied migrations, use `django-admin migrate --plan`."

> https://groups.google.com/d/msgid/django-developers/CAMyDDM2Nb_AWfsx05EVydo4PV20iWbcA4GBbZCT_Rn%3De%3D%3DMFXA%40mail.gmail.com
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[Adam Johnson]

Sure, feel free to open a PR and mention me in a comment with "@adamchainz" so I see it.

To view this discussion on the web visit https://groups.google.com/d/msgid/django-developers/43b482b485ed96dd4f09ecb655d812f2%40skychristensen.com.

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Adam