chore: migrate all VV learning units

so that their self evaluation pages show the ask for mentor feedback stuff

server/vbv_lernwelt/learnpath/migrations/0015_set_feedback_user_mentor_for_vv.py

@@ -0,0 +1,50 @@
+# Generated by Django 3.2.20 on 2024-02-12 15:19
+
+from django.db import migrations
+
+
+VV_COURSE_IDS_WITH_MENTOR_FEEDBACK = [
+    -4,  # vv-de
+    -10,  # vv-fr
+    -11,  # vv-it
+]
+
+
+def is_learning_unit_in_vv_course(learning_unit):
+    return learning_unit.course_category.course_id in VV_COURSE_IDS_WITH_MENTOR_FEEDBACK
+
+
+def mutate_data(apps, schema_editor):
+    """
+    Enable feedback for learning units in VV courses, this means that on the self-assessment page
+    of the learning unit, the user can request feedback from the mentor.
+    """
+
+    LearningUnit = apps.get_model("learnpath", "LearningUnit")  # noqa
+    for learning_unit in LearningUnit.objects.all():
+        if is_learning_unit_in_vv_course(learning_unit):
+            learning_unit.feedback_user = "MENTOR_FEEDBACK"
+            learning_unit.save()
+
+
+def rollback_data(apps, schema_editor):
+    """
+    Disable feedback for learning units in VV courses, this means that on the self-assessment page
+    of the learning unit, the user can not request feedback from the mentor. -> Default behaviour.
+    """
+
+    LearningUnit = apps.get_model("learnpath", "LearningUnit")  # noqa
+    for learning_unit in LearningUnit.objects.all():
+        if is_learning_unit_in_vv_course(learning_unit):
+            learning_unit.feedback_user = "NO_FEEDBACK"
+            learning_unit.save()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("learnpath", "0014_alter_learningunit_feedback_user"),
+    ]
+
+    operations = [
+        migrations.RunPython(mutate_data, rollback_data),
+    ]