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Suor

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1 points·by Suor·3 years ago·0 comments

[untitled]

1 points·by Suor·3 years ago·0 comments

[untitled]

1 points·by Suor·3 years ago·0 comments

Ban 1+N in Django

suor.github.io
175 points·by Suor·3 years ago·148 comments

comments

Suor
·3 years ago·discuss
Writing things directly is tightly coupling code. Sometimes quite distant portions of it, i.e. database access and presentation logic. With ORM and some smarter lazy technics or introspection at least you can untie it, with hand written SQL there is no way. And the reason is strings are poorly composable. Unless you use some query generator, but then we are back to ORM-like something.
Suor
·3 years ago·discuss
Never used this, but I see that it provides a context manager/decorator, which you can use to "shield" any code. And also some shortcuts for DjangoREST or something.

Regarding extra code, you can simply replace the Djangos' `render()`, with the one from this lib and you are done. I would have probably made a custom template extension or something to do that for all renders automatically though too.
Suor
·3 years ago·discuss
cacheops is more of a general purpose ORM caching with automatic invalidation.
Suor
·3 years ago·discuss
For that fetching in chunks is usually a way to go. I use something of these usually https://handy.readthedocs.io/en/latest/db.html#queryset_iter...
Suor
·3 years ago·discuss
GraphQL makes it even more fun :)
Suor
·3 years ago·discuss
I usually use `.values()` and `.values_list()` only when model creation is really slow. Usually many rows fetched.
Suor
·3 years ago·discuss
Actually there is such thing already https://pypi.org/project/django-auto-prefetch/ Not a monkey patch though, so will only work on the models you inherit from this.
Suor
·3 years ago·discuss
Here is an example of such thing https://github.com/Suor/django-cacheops/blob/8b3a79de29b2545...
Suor
·3 years ago·discuss
Should be easy enough to implement. You only need a context manager that adds 1 to some threadlocal flag on enter and subrracts on exit then check this flag in the monkey patch. Not sure how costly that will be though.
Suor
·3 years ago·discuss
cacheops can do the same, but it never came to my mind to actually go this way. I would rather write some special code to fetch with `id__in=[...]` and then cache individually.
Suor
·3 years ago·discuss
HN keeps automatically replacing the URL. It used to be a redirect before, but not anymore
Suor
·3 years ago·discuss
Thanks