old_contents: from django import forms
  from django.utils.translation import ugettext_lazy as _, ugettext as __
  from .models import Funding
  from .widgets import PerksAmountWidget
  
  
  class FundingForm(forms.Form):
      required_css_class = 'required'
  
      amount = forms.DecimalField(label=_("Amount"), decimal_places=2,
          widget=PerksAmountWidget())
      name = forms.CharField(label=_("Name"), required=False,
          help_text=_("Optional name for public list of contributors"))
      email = forms.EmailField(label=_("Contact e-mail"),
          help_text=_("We'll use it to contact you about your perks and fundraiser status and payment updates.<br/> "
              "Won't be publicised."), required=False)
  
      def __init__(self, offer, *args, **kwargs):
          self.offer = offer
          super(FundingForm, self).__init__(*args, **kwargs)
          self.fields['amount'].widget.form_instance = self
  
      def clean_amount(self):
          if self.cleaned_data['amount'] <= 0:
              raise forms.ValidationError(__("Enter positive amount."))
          return self.cleaned_data['amount']
  
      def clean(self):
          if not self.offer.is_current():
              raise forms.ValidationError(__("This offer is out of date."))
          return self.cleaned_data
  
      def save(self):
          return Funding.objects.create(
              offer=self.offer,
              name=self.cleaned_data['name'],
              email=self.cleaned_data['email'],
              amount=self.cleaned_data['amount'],
          )
  
  
new_contents: from django import forms
  from django.utils.translation import ugettext_lazy as _, ugettext as __
  from .models import Funding
  from .widgets import PerksAmountWidget
  
  
  class FundingForm(forms.Form):
      required_css_class = 'required'
  
      amount = forms.DecimalField(label=_("Amount"), decimal_places=2,
          widget=PerksAmountWidget())
      name = forms.CharField(label=_("Name"), required=False,
          help_text=_("Optional name for public list of contributors"))
      email = forms.EmailField(label=_("Contact e-mail"),
          help_text=_("We'll use it to contact you about your perks and fundraiser status and payment updates.<br/> "
              "Won't be publicised."), required=False)
  
      def __init__(self, offer, *args, **kwargs):
          self.offer = offer
          super(FundingForm, self).__init__(*args, **kwargs)
          self.fields['amount'].widget.form_instance = self
  
      def clean_amount(self):
          if self.cleaned_data['amount'] <= 0:
              raise forms.ValidationError(__("Enter positive amount."))
          return self.cleaned_data['amount']
  
      def clean(self):
          if not self.offer.is_current():
              raise forms.ValidationError(__("This offer is out of date."))
          return self.cleaned_data
  
      def save(self):
          funding = Funding.objects.create(
              offer=self.offer,
              name=self.cleaned_data['name'],
              email=self.cleaned_data['email'],
              amount=self.cleaned_data['amount'],
          )
          funding.perks = funding.offer.get_perks(funding.amount)
          return funding
  
  
subject: Set perks on form save.