add is_public attribute to course models and show

only then to anonymous uses

courses/migrations/0004_course_is_public.py

+# Generated by Django 2.2.12 on 2020-04-21 03:06
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('courses', '0003_lesson_thumbnail'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='course',
+            name='is_public',
+            field=models.BooleanField(default=False, verbose_name='Public'),
+        ),
+    ]

courses/models.py

@@ -139,6 +139,11 @@ class Course(models.Model):
         related_name="courses",
     )
 
+    is_public = models.BooleanField(
+        _('Public'),
+        default=False,
+    )
+
     class Meta:
         verbose_name = _('Course')
         verbose_name_plural = _('Courses')

courses/views.py

@@ -19,7 +19,7 @@ class CourseViewSet(viewsets.ModelViewSet):
         queryset = super(CourseViewSet, self).get_queryset()
 
         if not self.request.user.is_authenticated:
-            return queryset.filter(status='published').prefetch_related('professors')
+            return queryset.filter(is_public=True, status='published').prefetch_related('professors')
 
         public_courses = self.request.query_params.get('public_courses', None)
         if public_courses: