Added custom filter that shows competitions with more than 10 participants and 25 submissions that are private

src/apps/competitions/admin.py

@@ -1,12 +1,48 @@
 from django.contrib import admin
+from django.utils.translation import gettext_lazy as _
 
 from . import models
 
 
+class privateCompetitionsFilter(admin.SimpleListFilter):
+    # Human-readable title which will be displayed in the
+    # right admin sidebar just above the filter options.
+    title = _("Private non-test")
+
+    # Parameter for the filter that will be used in the URL query.
+    parameter_name = "private"
+
+    def lookups(self, request, model_admin):
+        """
+        Returns a list of tuples. The first element in each
+        tuple is the coded value for the option that will
+        appear in the URL query. The second element is the
+        human-readable name for the option that will appear
+        in the right sidebar.
+        """
+        return [
+            ("privateSmall", _("Submissions >= 25 and Participants >= 10")),
+        ]
+
+    def queryset(self, request, queryset):
+        """
+        Returns the filtered queryset based on the value
+        provided in the query string and retrievable via
+        `self.value()`.
+        """
+        # Only show private competitions with >= 25 submissions and >=10 participants
+        if self.value() == "privateSmall":
+            return queryset.filter(
+                published=False,
+                submissions_count__gte=10,
+                participants_count__gte=5
+            )
+
+
 class CompetitionAdmin(admin.ModelAdmin):
     search_fields = ['title', 'docker_image', 'created_by__username']
     list_display = ['id', 'title', 'created_by', 'is_featured']
-    list_filter = ['is_featured']
+    list_filter = ['is_featured', privateCompetitionsFilter]
 
 
 admin.site.register(models.Competition, CompetitionAdmin)