Resolve "extend worker class"

Closes #183 (closed)

smash/web/forms/voucher_forms.py

@@ -7,8 +7,9 @@ from django.utils import timezone
 
 from web.algorithm import VerhoeffAlgorithm
 from web.forms.forms import DATEPICKER_DATE_ATTRS
-from web.models import VoucherType, VoucherTypePrice, Voucher
+from web.models import VoucherType, VoucherTypePrice, Voucher, Worker
 from web.models.constants import VOUCHER_STATUS_NEW, VOUCHER_STATUS_USED
+from web.models.worker_study_role import WORKER_VOUCHER_PARTNER
 
 logger = logging.getLogger(__name__)
 
@@ -42,6 +43,7 @@ class VoucherForm(ModelForm):
         super(VoucherForm, self).__init__(*args, **kwargs)
 
         self.fields['voucher_type'].queryset = voucher_types
+        self.fields['usage_partner'].queryset = Worker.get_workers_by_worker_type(WORKER_VOUCHER_PARTNER)
 
         self.fields['number'].widget.attrs['readonly'] = True
         self.fields['number'].required = False