I have PositiveIntegerField in my model, that represents unique, new
number of newly added element (it's newspaper no.). It must be editable
in admin form.
Now i would to assign a default value to the next available integer, so
person, who will be adding new element, have that field autopopulated.
What is best way to do that?
Can i assign callable function to 'default ' value, that will query for
highest used integer?
Mind that it needs to be editable, because first used value is unknown,
and some values might be skipped.
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