> Some questions/considerations/feedback I would love to see
> addressed if they haven't been already (and please don't take
> them as a knock against your work...I love the idea of
> constraints and I'm pleased to see your work on them):
I was probably asked to post to the Django-users list for such
feedback.
I am open to suggestions/criticisms because they help you perform
better.
> 1) are cross-table constraints possible? E.g.
>
> constraints = (
> ('check_manager',
> Check(user__manager__active = True)
> )
> )
Haven't thought about this yet....but now its on my todo list.
> 2) do they support boolean constructs like the Q() objects do? E.g.
>
> constraints = (
> ('check_foo',
> Check(field__gte=100) | Check(field__lte=42)
> )
> )
This is supported.
> constraints = (
> ('check_foo',
> Check(Q(field__gte=100) | Q(field__lte=42))
> )
> )
This too I haven't thought of....studying this feasibility.
> 3) namespacing for the constraints to prevent naming clashes?
> using your example, if a second model also has a check with a
> constraint named "check_name", the generated code will try to
> create to constraints with the same name. I don't know if this
> is a problem in all DBs, but IIRC, at least PostgreSQL will
> kvetch at the condition. Perhaps prefixing the constraint-name
> with the table name would solve the problem?
>
> CREATE TABLE "appname_manufacturerer" (
> ...
> CONSTRAINT "appname_manufacturer__check_name"
> CHECK ("mfg_name" like 'Merc%%'),
> ...
> );
One more item in my todo list now.
> 4) do the constraints get dropped properly when doing a DB purge
> (using "manage.py sqlclear" or "manage.py sqlreset")?
Yes they do get dropped cleanly.
Thanks for the feedback.
Cheers
Thejaswi Puthraya
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