Migrations index doubling

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Andrew Pashkin

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May 27, 2014, 6:07:29 AM5/27/14
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Sometimes, merges in VCS may cause such situation, when for one application two migrations have same index, like:

    0028_migration_x_from_branch_a
    0028_migration_y_from_branch_b


Is it normal situation, or I should correct one of the indexes, to make them sequential?

Andrew Godwin

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May 27, 2014, 3:24:00 PM5/27/14
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Hi Andrew,


Basically, if the two migrations touch different things, it's fine, but you'll still need to make an empty migration afterwards to have the autodetector work properly. The upcoming Django migrations, on the other hand, are better at merges and don't need the extra migration.

Andrew


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Andrew Pashkin

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May 28, 2014, 2:52:40 AM5/28/14
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Hi! Thanks for the response.

I've read the docs, but I don't fully understood it. Now I get it - the whole reason for empty migration is in freezing ORM properly and making South detect new changes correctly.
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Andrew Pashkin

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Jun 4, 2014, 12:37:37 PM6/4/14
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How to revert doubled migrations? =)
Say, I have this:
0028_a
0028_b
0029_a
0029_b

And migrations b comes from branch B and a from A. So I need to revert b migrations, how to do that?

Andrew Pashkin

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Jun 4, 2014, 1:21:05 PM6/4/14
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I've solved this by deleting migrations that need to be preserved from migrations history in DB, then migrating backwards and then restoring records from migrations history in DB.

But thats kind of hacky, in a bad meaning.

Martin Maney

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Jun 4, 2014, 8:26:47 PM6/4/14
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On Wed, Jun 04, 2014 at 09:21:02PM +0400, Andrew Pashkin wrote:
> I've solved this by deleting migrations that need to be preserved
> from migrations history in DB, then migrating backwards and then
> restoring records from migrations history in DB.
>
> But thats kind of hacky, in a bad meaning.

Uhm, yeah. Guess it would work, but...

> On 04.06.2014 20:37, Andrew Pashkin wrote:
> >How to revert doubled migrations? =)
> >Say, I have this:
> >
> > 0028_a
> > 0028_b
> > 0029_a
> > 0029_b
> >
> >And migrations b comes from branch B and a from A.So I need to
> >revert b migrations, how to do that?

migrate (back) to 0028_a, remove the b migration files, migrate
forwards (to 0029_a). Assuming 0029_a works both forwards and
backwards and doesn't lose information. :-/

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Andrew Pashkin

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Jun 5, 2014, 2:44:18 AM6/5/14
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On 05.06.2014 04:26, Martin Maney wrote:
> and doesn't lose information. :-/
Well, in my case it doesn't, but oftenly it does - columns drops for
example.
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