Migrations index doubling

[Andrew Pashkin]

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]

Hi Andrew,

There's some documentation on this: http://south.readthedocs.org/en/latest/tutorial/part5.html#team-workflow

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]

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]

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]

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]

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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the vast superstructure of industry founded and built up, but on those who,
aching for a luxury beyond their reach and for a leisure forever denied them,
could be bullied or wheedled into spending their few hardly won shillings
on whatever might give them, if only for a moment, a leisured and
luxurious illusion. -- Dorothy Sayers, _Murder Must Advertise_

[Andrew Pashkin]

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.