feat: add method to get unique courses offered (DS-268)

openedx/features/survey_report/application.py

@@ -0,0 +1,9 @@
+"""
+Contains the logic to manage survey report model.
+"""
+
+from openedx.features.survey_report.queries import get_unique_courses_offered
+
+def generate_report() -> None:
+    """ Generate a report with relevant data."""
+    courses_offered=get_unique_courses_offered()

openedx/features/survey_report/management/commands/generate_report.py

@@ -0,0 +1,26 @@
+"""
+CLI command to generate survey report.
+"""
+
+from django.core.management.base import BaseCommand, CommandError
+from openedx.features.survey_report.application import generate_report
+
+class Command(BaseCommand):
+    """
+    Management command to generate a new survey report with
+    non-sensitive data.
+    """
+
+    help = """
+        This command will create a new survey report using some
+        models to get the total number oof courses offered, currently active learners,
+        learners ever registered, and generated certificates.
+        """
+
+    def handle(self, *args, **options):
+        try:
+            generate_report()
+        except Exception as error:
+            raise CommandError('An error has ocurred while report was generating.') from error
+
+        self.stdout.write(self.style.SUCCESS('Survey report has been generated successfully.'))

openedx/features/survey_report/management/commands/tests/test_generate_report.py

@@ -0,0 +1,13 @@
+"""
+Test for generate_report command.
+"""
+
+from io import StringIO
+from django.core.management import call_command
+from django.test import TestCase
+
+class GenerateReportTest(TestCase):
+    def test_command_output(self):
+        out = StringIO()
+        call_command('generate_report', stdout=out)
+        self.assertIn('Survey report has been generated successfully.', out.getvalue())

openedx/features/survey_report/queries.py

@@ -0,0 +1,27 @@
+"""
+Queries to get data from database.
+"""
+
+from datetime import datetime
+from openedx.core.djangoapps.content.course_overviews.models import CourseOverview
+from common.djangoapps.student.models import CourseEnrollment
+
+
+from django.db.models import Q, Subquery, OuterRef, Count
+
+def get_unique_courses_offered() -> int:
+    """
+    Get total number of unique courses offered.
+    """
+    return CourseOverview.objects.annotate(
+        count = Subquery(
+            CourseEnrollment.objects
+                .filter(course_id=OuterRef('id'))
+                .values('course_id')
+                .annotate(count=Count('course_id'))
+                .values('count')
+                ))\
+        .filter(count__gt=5)\
+        .filter(start__lt=datetime.now())\
+        .filter(Q(end__isnull=True)|Q(end__gt=datetime.now()))\
+        .count()