Resolve "Make exam a many to many field on StudentInfo model"

Closes #233 (closed)

core/migrations/0005_auto_20200707_1456.py

+# Generated by Django 2.2.12 on 2020-07-07 14:56
+
+import core.models.user_account
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0004_feedback_modified'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='studentinfo',
+            name='exam',
+        ),
+        migrations.RemoveField(
+            model_name='studentinfo',
+            name='passes_exam',
+        ),
+        migrations.RemoveField(
+            model_name='studentinfo',
+            name='total_score',
+        ),
+        migrations.AlterField(
+            model_name='useraccount',
+            name='exercise_groups',
+            field=models.ManyToManyField(blank=True, default=core.models.user_account.group_default, related_name='users', to='core.Group'),
+        ),
+        migrations.CreateModel(
+            name='StudentsExam',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('total_score', models.PositiveIntegerField(default=0)),
+                ('passes_exam', models.BooleanField(default=False)),
+                ('exam', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='exam', to='core.ExamType')),
+                ('student', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='students', to='core.StudentInfo')),
+            ],
+        ),
+        migrations.AddField(
+            model_name='studentinfo',
+            name='exams',
+            field=models.ManyToManyField(blank=True, related_name='exams', to='core.StudentsExam'),
+        ),
+    ]