Hi,
I have the following pseudo model that I will use as the basis of a
modelformset:
class Entry:
athlete = ForeignKey(athlete)
category = ForeignKey(category)
race_number = IntegerField
I have a page that displays each athlete's details so the choice of athlete
has already been made. I want to add a formset that allows a user to
specify a race_number for each of the possible categories available.
An obvious way would be for there to be one Entry for each
athlete/category, but in practise this will result in a large entry table
that is only ~10% actual data, with the rest being superfluous rows. I'd
prefer to avoid this.
Let's assume that an athlete is already entered in 2 categories out of a
possible 10. The queryset will return the 2 existing entries, and I can use
extra=8 to add in the other possibilities. However, I am not yet done. I
want to do the following and would like advice on how to accomplish this:
1. The category for each the 8 possible new entries needs to be assigned
before displaying the form - I already know what they are and want to
display these categories to the user, leaving the race_number as the only
input field.
2. The categories have a particular (chronological) order that I want
respected in displaying the forms to the user, so the 2 existing and 8
possible new categories need to be interspersed to follow the correct order.
3. When it comes time to save the formset, I want only those categories
that have been changed by having a race_number assigned or removed to be
saved. I want the entries where the race_number has been removed to remain
in the entry table. I think I need a way to detect and remove the forms
that have not been changed by the user before saving the formset.
Any pointers as to how to do this?
Thanks!
R.
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