Make `start` in DueDate mandatory

client/src/stores/courseSessions.ts

@@ -216,7 +216,7 @@ export const useCourseSessionsStore = defineStore("courseSessions", () => {
       if (!dateA.isValid()) return 1; // If dateA is invalid, it goes after dateB
       if (!dateB.isValid()) return -1; // If dateB is invalid, it goes after dateA
 
-      return dateA.diff(dateB); // Otherwise, sort by the end date
+      return dateA.diff(dateB); // sort by `start`
     });
   }
 

server/vbv_lernwelt/course_session/admin.py

@@ -8,7 +8,6 @@ from vbv_lernwelt.course_session.models import (
 
 @admin.register(CourseSessionAttendanceCourse)
 class CourseSessionAttendanceCourseAdmin(admin.ModelAdmin):
-    # Inline fields are not possible for the DueDate model, because it is not a ForeignKey relatoion.
     readonly_fields = [
         "course_session",
         "learning_content",
@@ -25,8 +24,12 @@ class CourseSessionAttendanceCourseAdmin(admin.ModelAdmin):
 
 @admin.register(CourseSessionAssignment)
 class CourseSessionAssignmentAdmin(admin.ModelAdmin):
-    # Inline fields are not possible for the DueDate model, because it is not a ForeignKey relatoion.
+    readonly_fields = [
-    readonly_fields = ["course_session", "learning_content"]
+        "course_session",
+        "learning_content",
+        "submission_deadline",
+        "evaluation_deadline",
+    ]
     list_display = [
         "course_session",
         "learning_content",

server/vbv_lernwelt/duedate/migrations/0004_alter_duedate_start.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.20 on 2023-08-23 13:15
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("duedate", "0003_auto_20230823_1126"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="duedate",
+            name="start",
+            field=models.DateTimeField(
+                db_index=True, help_text="Startdatum ist Pflicht", null=True
+            ),
+        ),
+    ]

server/vbv_lernwelt/duedate/models.py

@@ -10,7 +10,7 @@ from vbv_lernwelt.course.models import CourseSession
 
 class DueDate(models.Model):
     start = models.DateTimeField(
-        null=True, blank=True, db_index=True, help_text="Startdatum ist Pflicht"
+        null=True, db_index=True, help_text="Startdatum ist Pflicht"
     )
     end = models.DateTimeField(
         null=True, blank=True, db_index=True, help_text="Enddatum ist optional"