[Pulp-dev] Required fields for models at the DB level

David Davis daviddavis at redhat.com
Mon Nov 18 21:06:43 UTC 2019

Without diving into the django code, I'm guessing that the problem is the
default value for text fields is a blank string. I bet if you set the
default=None on fields that don't accept null, they would become 'required'
(although I don't think this concept actually exists in django at the model

I think Fabricio's solution would work. However, it doesn't 'require'
fields so much as prevent blank strings from being saved in the database.
And I think that's what we want?


On Mon, Nov 18, 2019 at 3:15 PM Fabricio Aguiar <fabricio.aguiar at redhat.com>

> the best way that I found so far is this:
> https://stackoverflow.com/a/56272674/5253051
> [image: image.png]4
> <https://stackoverflow.com/a/56272674/5253051>
> Best regards,
> Fabricio Aguiar
> Software Engineer, Pulp Project
> Red Hat Brazil - Latam <https://www.redhat.com/>
> +55 11 999652368
> On Mon, Nov 18, 2019 at 5:09 PM Tatiana Tereshchenko <ttereshc at redhat.com>
> wrote:
>> I noticed that there is no enforcement at the DB level to require certain
>> fields to be present on a model.
>> I haven't checked all the field types but at least for TextField it's
>> seems to be true.
>> Even though `null` is False by default (`blank` as well), I can save a
>> model instance without most of fields set.
>> As an example, for UpdateRecord [0] in RPM plugin, plugin writer can do
>> UpdateRecord().save() and it will be fine, all the fields are set to empty
>> string :/ It wouldn't be possible to save it twice but it's due to the
>> uniqueness constraints.
>> In case plugin writer doesn't set properly all the required fields,
>> bad/corrupted model instances will be silently saved in the DB and plugin
>> can potentially have data migration issues later.
>> Any suggestions how to handle that? Or do I miss anything?
>> Tanya
>> [0]
>> https://github.com/pulp/pulp_rpm/blob/master/pulp_rpm/app/models.py#L440-L463
>> _______________________________________________
>> Pulp-dev mailing list
>> Pulp-dev at redhat.com
>> https://www.redhat.com/mailman/listinfo/pulp-dev
> _______________________________________________
> Pulp-dev mailing list
> Pulp-dev at redhat.com
> https://www.redhat.com/mailman/listinfo/pulp-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/pulp-dev/attachments/20191118/05790aaa/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 64987 bytes
Desc: not available
URL: <http://listman.redhat.com/archives/pulp-dev/attachments/20191118/05790aaa/attachment.png>

More information about the Pulp-dev mailing list