Improved subjects model and serializer

stude/subjects/migrations/0003_subjectcode_remove_subject_code_subject_code.py

@@ -0,0 +1,29 @@
+# Generated by Django 4.2.3 on 2023-07-19 07:04
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('subjects', '0002_alter_subject_code_alter_subject_name_and_more'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='SubjectCode',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('code', models.CharField(max_length=16, unique=True)),
+            ],
+        ),
+        migrations.RemoveField(
+            model_name='subject',
+            name='code',
+        ),
+        migrations.AddField(
+            model_name='subject',
+            name='code',
+            field=models.ManyToManyField(to='subjects.subjectcode'),
+        ),
+    ]

stude/subjects/migrations/0004_rename_code_subject_codes.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.3 on 2023-07-19 07:09
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('subjects', '0003_subjectcode_remove_subject_code_subject_code'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='subject',
+            old_name='code',
+            new_name='codes',
+        ),
+    ]