Add products on billings

apps/treasury/forms.py

@@ -0,0 +1,29 @@
+# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from crispy_forms.helper import FormHelper
+from django import forms
+
+from .models import Billing, Product
+
+
+class BillingForm(forms.ModelForm):
+    class Meta:
+        model = Billing
+        fields = '__all__'
+
+
+ProductFormSet = forms.inlineformset_factory(
+    Billing,
+    Product,
+    fields='__all__',
+    extra=1,
+)
+
+class ProductFormSetHelper(FormHelper):
+    def __init__(self, form=None):
+        super().__init__(form)
+        self.form_tag = False
+        self.form_method = 'POST'
+        self.form_class = 'form-inline'
+        self.template = 'bootstrap4/table_inline_formset.html'