Fix pagination controls, move mixin to common app, fix pagination invocation on all views, and other random bug fixes

common/mixins.py

@@ -0,0 +1,34 @@
+from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
+
+
+class ReusablePaginationMixin:
+    per_page = 10
+
+    def get_page_number(self):
+        try:
+            return int(self.request.GET.get("page", 1))
+        except (ValueError, TypeError):
+            return 1
+
+    def paginate_data(self, data, page_number):
+        """
+        Paginates data (a QuerySet or list) and returns a tuple: (page_data, pagination_context).
+        """
+        paginator = Paginator(data, self.per_page)
+        try:
+            page = paginator.page(page_number)
+        except PageNotAnInteger:
+            page = paginator.page(1)
+        except EmptyPage:
+            page = paginator.page(paginator.num_pages)
+
+        pagination_context = {
+            "number": page.number,
+            "has_previous": page.has_previous(),
+            "has_next": page.has_next(),
+            "previous_page_number": page.previous_page_number() if page.has_previous() else 1,
+            "next_page_number": page.next_page_number() if page.has_next() else paginator.num_pages,
+            "paginator": {"num_pages": paginator.num_pages},
+            "count": paginator.count
+        }
+        return page.object_list, pagination_context