Re: More eyes on Check Constraints

[David Sanders]

Hi Ian,

Interestingly enough I'd just recently 
written https://github.com/rapilabs/django-db-constraints based on Matt 
Schinckel's idea.  I wrote that because although check constraints are 
great, I really wanted a way to supply any type of constraint - primarily 
composite foreign keys.  I don't suppose that this would be a possibility 
as a future extension of your pull request?

Cheers,
David


On Friday, August 11, 2017 at 4:15:26 AM UTC+10, Ian Foote wrote:
>
> Hi all, 
>
> I've been working on https://code.djangoproject.com/ticket/11964 to add 
> support for Check Constraints to the Django ORM and migrations 
> framework. My work can be found at 
> https://github.com/django/django/pull/7615. 
>
> I think the functionality is basically there, so what it really needs is 
> some testing on real-world use-cases and more eyes to suggest any 
> further simplifications or improvements that may be possible. 
>
> Thanks, 
>
> Ian 
>
>

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Re: More eyes on Check Constraints

[Ian Foote]

Hi David,

That's an interesting idea. I haven't thought very deeply about
composite foreign keys myself, so I can't say for certain how easy it
would be to build on top of my work.

I did a quick search for prior discussion about this and found
https://code.djangoproject.com/wiki/MultipleColumnPrimaryKeys and
https://code.djangoproject.com/ticket/373. These are probably a good
place to start - I plan to have a good read over the next week.

Your library also looks interesting. I also plan to take a close look to
see if there's anything I can learn from there. I wonder if it's worth
trying to converge our implementations - if my patch lands in Django it
would be great to have a compatible implementation that people can use
on earlier versions.

Thanks,
Ian

On 13/08/17 17:44, David Sanders wrote:
> Hi Ian,
> 
> Interestingly enough I'd just recently
> written https://github.com/rapilabs/django-db-constraints based on Matt
> Schinckel's idea.  I wrote that because although check constraints are
> great, I really wanted a way to supply any type of constraint -
> primarily composite foreign keys.  I don't suppose that this would be a
> possibility as a future extension of your pull request?
> 
> Cheers,
> David
> 
> 
> On Friday, August 11, 2017 at 4:15:26 AM UTC+10, Ian Foote wrote:
> 
> Hi all,
> 
> I've been working on https://code.djangoproject.com/ticket/11964
>  to add
> support for Check Constraints to the Django ORM and migrations
> framework. My work can be found at
> https://github.com/django/django/pull/7615
> .
> 
> I think the functionality is basically there, so what it really
> needs is
> some testing on real-world use-cases and more eyes to suggest any
> further simplifications or improvements that may be possible.
> 
> Thanks,
> 
> Ian
> 
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> Groups "Django developers (Contributions to Django itself)" group.
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> To view this discussion on the web visit
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