django - Modelform: need to get access to related model through the form -

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i have models:

class item(model):   name = ...   size = ... class instance(model):   item = foreignkey(item)   date = datefield()

now need make reception, collect formset of items, transform them instances, store instances inside reception (the items don't need stored in reception).
don't understand on level should this: in model, in form, in view, or in template (perhaps not). i'm confused it.
should make 2 fields in reception model (one items , 1 instances) hide instances field in receptionform? , continue through view create transform, clean unneeded items data reception?


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