Re: Can migrated apps depend on unmigrated apps?

[Carsten Fuchs]

Hi Collin,

thank you very much for your reply!

Am 19.02.2015 um 19:35 schrieb Collin Anderson:

If you haven't yet, you could try generating migrations for the
unmigrated app, and reference them using MIGRATION_MODULES.


I've tried this, and my real problem is that I have problems with this 
step, i.e. applying the initial migrations to the unmigrated app: Please 
see  
for details. Any help about this would very much be appreciated!


Many thanks and best regards,
Carsten

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Re: Can migrated apps depend on unmigrated apps?

[Collin Anderson]

Hi Carsten,

I in my experience, it _sometimes_ works to have migrated apps depend on 
unmigrated apps.

If you haven't yet, you could try generating migrations for the unmigrated 
app, and reference them using MIGRATION_MODULES.

Collin

On Tuesday, February 17, 2015 at 5:00:26 PM UTC-5, Carsten Fuchs wrote:
>
> Hi Michael, 
>
> Am 17.02.2015 um 22:44 schrieb Michael Pöhn: 
> > This is all covered in Djangos documentation... 
> > https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies 
>
> Well, no... please see below. 
>
> > Let me paste the relevant parts for you: 
> > 
> > »Be aware, however, that unmigrated apps cannot depend on migrated apps, 
> [...]« 
>
> This explains that unmigrated apps cannot depend on migrated apps. 
>
> My question is about the opposite case: Can migrated apps depend on 
> unmigrated apps? I've explained the apparent problem in greater detail 
> in my original post. 
>
> Best regards, 
> Carsten 
>
>

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Re: Can migrated apps depend on unmigrated apps?

[Carsten Fuchs]

Hi Michael,

Am 17.02.2015 um 22:44 schrieb Michael Pöhn:

This is all covered in Djangos documentation...
https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies


Well, no... please see below.


Let me paste the relevant parts for you:

»Be aware, however, that unmigrated apps cannot depend on migrated apps, [...]«


This explains that unmigrated apps cannot depend on migrated apps.

My question is about the opposite case: Can migrated apps depend on 
unmigrated apps? I've explained the apparent problem in greater detail 
in my original post.


Best regards,
Carsten

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Re: Can migrated apps depend on unmigrated apps?

[Michael Pöhn]

On 17.02.2015 21:29, Carsten Fuchs wrote:
> Hi all,
>
> Am 04.02.2015 um 18:26 schrieb Carsten Fuchs:
>> can apps that use migrations depend on unmigrated apps?
>
> Anyone please?
>
> It seems like this works in practice, but this still looks like a
> contradiction to me, and I would still be interested in some feedback
> for a firmer foundation for ongoing work…
>

This is all covered in Djangos documentation...
https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies

Let me paste the relevant parts for you:

»Be aware, however, that unmigrated apps cannot depend on migrated apps,
by the very nature of not having migrations. This means that it is not
generally possible to have an unmigrated app have a ForeignKey or
ManyToManyField to a migrated app; some cases may work, but it will
eventually fail.

Warning: Even if things appear to work with unmigrated apps depending on
migrated apps, Django may not generate all the necessary foreign key
constraints.«

br.
Michael

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Re: Can migrated apps depend on unmigrated apps?

[Carsten Fuchs]

Hi all,

Am 04.02.2015 um 18:26 schrieb Carsten Fuchs:

can apps that use migrations depend on unmigrated apps?


Anyone please?

It seems like this works in practice, but this still looks like a 
contradiction to me, and I would still be interested in some feedback 
for a firmer foundation for ongoing work…


Best regards,
Carsten

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Can migrated apps depend on unmigrated apps?

[Carsten Fuchs]

Dear Django developers,

can apps that use migrations depend on unmigrated apps?

The documentation at 
<https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies> 
explains how dependencies work, and explicitly mentions that unmigrated 
apps cannot depend on migrated apps.


In turn it seems to imply that migrated apps *can* depend on unmigrated 
apps, but is that correct? In the docs example where `books` have a 
foreign key and thus depend on `authors`, does it really work if 
`authors` is unmigrated? How would it be able to run the `authors` 
migration to create the table the foreign key in `books` references, if 
`authors` is unmigrated?



This is an implication of my so far unfruitful attempts to add 
migrations to an older, existing app as described in thread 
<https://groups.google.com/forum/#!topic/django-users/lVS24BGFouo>, 
where I have exactly this situation:


The older app is still unmigrated (as I could not yet find a way to 
overcome the problems with making it migrated), and would like to create 
a new one in the meanwhile. The new app has a foreign key on a model in 
the old one, and now I'm wondering if it is wise to proceed...?


Any hints and help would very much be appreciated!   :-)

Best regards,
Carsten

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