Override the process_step method do that when step one is being
processed, it creates the queryset to be used by step 2 then.
if(step==1):
if(form.is_valid()):
self.step2_queryset=Book.objects.filter(**form.cleaned_data)
elif(step==0):
self.step2_queryset=None
Then, override the get_form method to grab the self.step2_queryset
variable and use it in the form. Thus you don't have to worry about
cleaning forms more than once.
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