add pages to manage returnable products

core/static/core/components/card.scss

@@ -55,6 +55,14 @@
     width: 80%;
   }
 
+  .card-top-left {
+    position: absolute;
+    top: 10px;
+    right: 10px;
+    padding: 10px;
+    text-align: center;
+  }
+
   .card-content {
     color: black;
     display: flex;

core/templates/core/delete_confirm.jinja

@@ -10,10 +10,17 @@
 {% block nav %}
 {% endblock %}
 
+{# if the template context has the `object_name` variable,
+   then this one will be used,
+   instead of the result of `str(object)` #}
+{% if object and not object_name %}
+  {% set object_name=object %}
+{% endif %}
+
 {% block content %}
   <h2>{% trans %}Delete confirmation{% endtrans %}</h2>
   <form action="" method="post">{% csrf_token %}
-    <p>{% trans obj=object %}Are you sure you want to delete "{{ obj }}"?{% endtrans %}</p>
+    <p>{% trans name=object_name %}Are you sure you want to delete "{{ name }}"?{% endtrans %}</p>
     <input type="submit" value="{% trans %}Confirm{% endtrans %}" />
   </form>
   <form method="GET" action="javascript:history.back();">

core/templates/core/user_tools.jinja

@@ -62,6 +62,11 @@
                   {% trans %}Product types management{% endtrans %}
                 </a>
               </li>
+              <li>
+                <a href="{{ url("counter:returnable_list") }}">
+                  {% trans %}Returnable products management{% endtrans %}
+                </a>
+              </li>
               <li>
                 <a href="{{ url('counter:cash_summary_list') }}">
                   {% trans %}Cash register summaries{% endtrans %}

core/views/mixins.py

@@ -1,3 +1,5 @@
+from typing import ClassVar
+
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.views import View
@@ -6,20 +8,24 @@ from django.views import View
 class TabedViewMixin(View):
     """Basic functions for displaying tabs in the template."""
 
+    current_tab: ClassVar[str | None] = None
+    list_of_tabs: ClassVar[list | None] = None
+    tabs_title: ClassVar[str | None] = None
+
     def get_tabs_title(self):
-        if hasattr(self, "tabs_title"):
-            return self.tabs_title
-        raise ImproperlyConfigured("tabs_title is required")
+        if not self.tabs_title:
+            raise ImproperlyConfigured("tabs_title is required")
+        return self.tabs_title
 
     def get_current_tab(self):
-        if hasattr(self, "current_tab"):
-            return self.current_tab
-        raise ImproperlyConfigured("current_tab is required")
+        if not self.current_tab:
+            raise ImproperlyConfigured("current_tab is required")
+        return self.current_tab
 
     def get_list_of_tabs(self):
-        if hasattr(self, "list_of_tabs"):
-            return self.list_of_tabs
-        raise ImproperlyConfigured("list_of_tabs is required")
+        if not self.list_of_tabs:
+            raise ImproperlyConfigured("list_of_tabs is required")
+        return self.list_of_tabs
 
     def get_context_data(self, **kwargs):
         kwargs = super().get_context_data(**kwargs)

core/views/user.py

@@ -28,7 +28,6 @@ from datetime import date, timedelta
 from operator import itemgetter
 from smtplib import SMTPException
 
-from django.conf import settings
 from django.contrib.auth import login, views
 from django.contrib.auth.forms import PasswordChangeForm
 from django.contrib.auth.mixins import LoginRequiredMixin