Add a lookup for exact CIDR prefix length

[tarkatronic]

We have fallen into a pattern of, for example: MyModel.objects.filter(network__max_prefixlen=24, network__min_prefixlen=24). To make this simpler, and allow for a single exact prefix length lookup, I've added __prefixlen. Also, as a side effect, I cleaned up the code a little bit for these lookups, making it more DRY.

[jimfunk]

Thanks!

[tarkatronic]

This brought to mind a thought: Instead of having 3 lookups: __prefixlen, __max_prefixlen, and __min_prefixlen, wouldn't it make sense to be able to just have a single __prefixlen and be able to chain other operations onto it? So for example you could have:

• MyModel.objects.filter(network__prefixlen=24)
• MyModel.objects.filter(network__prefixlen__gte=24)
• MyModel.objects.filter(network__prefixlen__lte=24)

I don't recall the exact implementation details for something like this, but what are your thoughts?

[jimfunk]

Yeah, that would make a lot more sense.