Create a generic form fragment renderer

core/templates/core/user_preferences.jinja

@@ -36,15 +36,7 @@
 
 
     {% if student_card %}
-      {% with
-      form=student_card.form,
-      action=student_card.context.action,
-      customer=student_card.context.customer,
-      student_cards=student_card.context.student_cards
-      %}
-      {% include student_card.template %}
-    {% endwith %}
-
+      {{ student_card }}
       <p class="justify">
         {% trans %}You can add a card by asking at a counter or add it yourself here. If you want to manually
           add a student card yourself, you'll need a NFC reader. We store the UID of the card which is 14 characters long.{% endtrans %}

core/utils.py

@@ -13,22 +13,41 @@
 #
 #
 
+from dataclasses import dataclass
 from datetime import date
 
 # Image utils
 from io import BytesIO
-from typing import Optional
+from typing import Any
 
 import PIL
 from django.conf import settings
 from django.core.files.base import ContentFile
+from django.forms import BaseForm
 from django.http import HttpRequest
+from django.template.loader import render_to_string
+from django.utils.html import SafeString
 from django.utils.timezone import localdate
 from PIL import ExifTags
 from PIL.Image import Image, Resampling
 
 
-def get_start_of_semester(today: Optional[date] = None) -> date:
+@dataclass
+class FormFragmentTemplateData[T: BaseForm]:
+    """Dataclass used to pre-render form fragments"""
+
+    form: T
+    template: str
+    context: dict[str, Any]
+
+    def render(self, request: HttpRequest) -> SafeString:
+        # Request is needed for csrf_tokens
+        return render_to_string(
+            self.template, context={"form": self.form, **self.context}, request=request
+        )
+
+
+def get_start_of_semester(today: date | None = None) -> date:
     """Return the date of the start of the semester of the given date.
     If no date is given, return the start date of the current semester.
 
@@ -58,7 +77,7 @@ def get_start_of_semester(today: Optional[date] = None) -> date:
     return autumn.replace(year=autumn.year - 1)
 
 
-def get_semester_code(d: Optional[date] = None) -> str:
+def get_semester_code(d: date | None = None) -> str:
     """Return the semester code of the given date.
     If no date is given, return the semester code of the current semester.
 

core/views/user.py

@@ -578,8 +578,8 @@ class UserPreferencesView(UserTabsMixin, CanEditMixin, UpdateView):
             kwargs["trombi_form"] = UserTrombiForm()
         if hasattr(self.object, "customer"):
             kwargs["student_card"] = StudentCardFormView.get_template_data(
-                self.request, self.object.customer
-            ).as_dict()
+                self.object.customer
+            ).render(self.request)
         return kwargs
 
 

counter/templates/counter/counter_click.jinja

@@ -31,14 +31,7 @@
       <p>{% trans %}Amount: {% endtrans %}{{ customer.amount }} €</p>
 
       {% if counter.type == 'BAR' %}
-        {% with
-        form=student_card.form,
-        action=student_card.context.action,
-        customer=student_card.context.customer,
-        student_cards=student_card.context.student_cards
-        %}
-        {% include student_card.template %}
-      {% endwith %}
+        {{ student_card }}
       {% endif %}
     </div>
 

counter/templates/counter/fragments/create_student_card.jinja

@@ -7,7 +7,7 @@
   >
     {% csrf_token %}
     {{  form.as_p() }}
-    <button>{% trans %}Go{% endtrans %}</button>
+    <input type="submit" value="{% trans %}Go{% endtrans %}"/>
 
   </form>
   <h6>{% trans %}Registered cards{% endtrans %}</h6>

counter/views/click.py

@@ -416,6 +416,6 @@ class CounterClick(CounterTabsMixin, CanViewMixin, DetailView):
         kwargs["refill_form"] = self.refill_form or RefillForm()
         kwargs["barmens_can_refill"] = self.object.can_refill()
         kwargs["student_card"] = StudentCardFormView.get_template_data(
-            self.request, self.customer
-        ).as_dict()
+            self.customer
+        ).render(self.request)
         return kwargs

counter/views/student_card.py

@@ -14,31 +14,19 @@
 #
 
 
-from dataclasses import asdict, dataclass
-from typing import Any
-
 from django.core.exceptions import PermissionDenied
 from django.http import HttpRequest
 from django.shortcuts import get_object_or_404
 from django.urls import reverse_lazy
 from django.views.generic.edit import DeleteView, FormView
 
+from core.utils import FormFragmentTemplateData
 from core.views import CanEditMixin
 from counter.forms import StudentCardForm
 from counter.models import Customer, StudentCard
 from counter.utils import is_logged_in_counter
 
 
-@dataclass
-class StudentCardTemplateData:
-    form: StudentCardForm
-    template: str
-    context: dict[str, Any]
-
-    def as_dict(self) -> dict[str, Any]:
-        return asdict(self)
-
-
 class StudentCardDeleteView(DeleteView, CanEditMixin):
     """View used to delete a card from a user."""
 
@@ -64,10 +52,10 @@ class StudentCardFormView(FormView):
 
     @classmethod
     def get_template_data(
-        cls, request: HttpRequest, customer: Customer
-    ) -> StudentCardTemplateData:
+        cls, customer: Customer
+    ) -> FormFragmentTemplateData[form_class]:
         """Get necessary data to pre-render the fragment"""
-        return StudentCardTemplateData(
+        return FormFragmentTemplateData[cls.form_class](
             form=cls.form_class(),
             template=cls.template_name,
             context={
@@ -99,7 +87,7 @@ class StudentCardFormView(FormView):
 
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
-        data = self.get_template_data(self.request, self.customer)
+        data = self.get_template_data(self.customer)
         context.update(data.context)
         return context