I would love to see little headers telling how many inserts, deletes and removes there are. That can be a separate change, or you can fold it into this change, but I think it would be awesome.

We should prevent saving models when we don't need to (as this will temporarily lock the table), so before setting and saving, let's check each of those fields to see if anything changed.

I know it's a bit redundant, but I'd rather these made their own queries. The reason is that if a caller is only interested in one of these counts, we shouldn't be performing three aggregate queries. Just slightly more efficient, even if it's a little bit of code duplication.

You could potentially create a private helper function in that class for generating a query given a field name, and use that in these functions and in line_counts.

Thanks for doing this - it'll be great to integrate this into my extension.  :D

Just one observation - see below.  Thanks,

-Mike

When I tried to run evolve, django-evolution flipped out because there were no default values for these new fields set, and I had pre-existing records.

I think Christian will have to take a look at this. I ran the evolution just fine, and I did provide both default and initial value.

I am not really sure what is going on here.