fixed passing_score field for assignments on the admin page

assignments/admin.py

@@ -5,7 +5,9 @@ from .models import Course
 
 
 class AssignmentAdmin(admin.ModelAdmin):
-    readonly_fields = ('id',)
+    readonly_fields = ('passing_score', 'id',)
+    fields = ('name', 'description', 'max_points', 'passing_score', 'image')
+    fields += ('id',)
 
 
 class CourseAdmin(admin.ModelAdmin):

assignments/migrations/0008_alter_assignment_passing_score.py

+# Generated by Django 4.0.3 on 2022-05-17 21:39
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assignments', '0007_alter_assignment_image'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='assignment',
+            name='passing_score',
+            field=models.IntegerField(default=6, editable=False),
+        ),
+    ]

assignments/models.py

@@ -7,7 +7,7 @@ class Assignment(models.Model):
     name = models.CharField(max_length=120)
     description = models.TextField(blank=True)
     max_points = models.IntegerField(default=10)
-    passing_score = models.IntegerField(default=6)
+    passing_score = models.IntegerField(default=6, editable=False)
     image = models.ImageField(null=True, blank=True, upload_to=images_dir)
 
     def save(self, *args, **kwargs):