Upgrading django from 1.8 to 2.2.0

[Santhosh sridhar]

Hi, 

Im upgrading my django project from 1.8 to 2.2.0. I have done the below changes.

1. Added on_delete to all the Foreign Key fields

2. Changed the url reverse import as from django.urls import reverse

3. Included path/re_path instead of url in all the app's url files.

4. Changed the MIDDLEWARE_CLASSES import in settings files to MIDDLEWARE = {}

I tried to run the server, still it says "TypeError: __init__() missing 1 required positional argument: 'on_delete' and it is pointing to /usr2/santhosh/myproject/myapp/migrations/0002_abc.py

What should I do now? Do I need to delete all the migration files and re-run python manage.py migrate or what?? Help me you are aware.

Regards,

Santhosh

[Mike Dewhirst]

On 31/01/2020 9:53 pm, Santhosh sridhar wrote:
> Hi,
> Im upgrading my django project from 1.8 to 2.2.0. I have done the
> below changes.
>
> 1. Added on_delete to all the Foreign Key fields
> 2. Changed the url reverse import as from django.urls import reverse
> 3. Included path/re_path instead of url in all the app's url files.
> 4. Changed the MIDDLEWARE_CLASSES import in settings files to
> MIDDLEWARE = {}
>
> I tried to run the server, still it says "TypeError: __init__()
> missing 1 required positional argument: 'on_delete' and it is pointing
> to /usr2/santhosh/myproject/myapp/migrations/0002_abc.py

There is nothing stopping you from adding the same arg to teh migration
file as you added to the model field concerned.

I frequently go back and edit migration files when all that's changed
for example is some help_text. I prefer to keep the number of migration
files as low as reasonable.

>
> What should I do now? Do I need to delete all the migration files and
> re-run python manage.py migrate or what?? Help me you are aware.
>
> Regards,
> Santhosh

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[אורי‎]

Upgrade Django from 1.8 to 1.9, then 1.10 etc. until 2.2. Each time run makemigratons and migrate and run your tests to see that everything works. And if there is a problem with a specific migration - maybe you have to edit it manually like Mike suggested.

From my experience, it takes time to upgrade Django and it's an average of about half a day per version. And if it's 6 versions you're upgrading, it can take you around 3 days to upgrade.

אורי

u...@speedy.net

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[אורי‎]

By the way, each time upgrade to the latest release of each version. So it's 2.2.9 you should use. And all the latest versions on https://www.djangoproject.com/download/ (1.9.13 etc.)

אורי

u...@speedy.net

On Fri, Jan 31, 2020 at 12:53 PM Santhosh sridhar <santhos...@gmail.com> wrote:

--

[אורי‎]

When you upgrade Django with pip, you can install the latest version of 1.9 with `pip install --upgrade "Django>=1.8,<1.10"` and then the same for each version, until you want the latest version of 2.2 and then use "Django>=1.8,<3.0". (actually the 1.8 is not needed here, you can also use 2.2 etc.)

אורי

u...@speedy.net

On Fri, Jan 31, 2020 at 12:53 PM Santhosh sridhar <santhos...@gmail.com> wrote:

--

[Maqdum Adewale]

i dont know why any time i run my django website with opra_mini browser it always bring source code

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