Add weightage for Quiz and Create Grading System App

App Name: grades

Grading System provides with the grade for a given value.
It contains different grade ranges.

Has its own default grading system.
Allows you to modify and add grading system wth grade ranges.

To be done:
- Need to add README
- Good UI
- There are fields like can_be_used and order in models for future use.
- More tests

App name: Yaksh

Now every quiz has a default weightage of 100%, can be changed.
An aggregate is calculated for a given course.
Using grades app a grade is provide to the aggregate value.

3 files changed, 81 insertions, 0 deletions

diff --git a/grades/migrations/0001_initial.py b/grades/migrations/0001_initial.py
new file mode 100644
index 0000000..65d711e
--- /dev/null
+++ b/grades/migrations/0001_initial.py
@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.5 on 2018-02-02 06:20
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='GradeRange',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('order', models.IntegerField(default=0)),
+                ('lower_limit', models.FloatField()),
+                ('upper_limit', models.FloatField()),
+                ('grade', models.CharField(max_length=10)),
+                ('description', models.CharField(blank=True, max_length=127, null=True)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='GradingSystem',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255, unique=True)),
+                ('description', models.TextField(default='About the grading system!')),
+                ('can_be_used', models.BooleanField(default=False)),
+                ('creator', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.AddField(
+            model_name='graderange',
+            name='system',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='grades.GradingSystem'),
+        ),
+    ]
diff --git a/grades/migrations/__init__.py b/grades/migrations/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/grades/migrations/__init__.py
diff --git a/grades/migrations/default_grading_system.py b/grades/migrations/default_grading_system.py
new file mode 100644
index 0000000..1629d29
--- /dev/null
+++ b/grades/migrations/default_grading_system.py
@@ -0,0 +1,36 @@
+from django.db import migrations
+
+def create_default_system(apps, schema_editor):
+    GradingSystem = apps.get_model('grades', 'GradingSystem')
+    GradeRange = apps.get_model('grades', 'GradeRange')
+    db = schema_editor.connection.alias
+
+    default_system = GradingSystem.objects.using(db).create(name='default',
+                                                           can_be_used=True)
+    GradeRange.objects.using(db).create(system=default_system, order=1, lower_limit=0,
+                              upper_limit=40, grade='F', description='Fail')
+    GradeRange.objects.using(db).create(system=default_system, order=2, lower_limit=40,
+                              upper_limit=55, grade='P', description='Pass')
+    GradeRange.objects.using(db).create(system=default_system, order=3, lower_limit=55,
+                              upper_limit=60, grade='C', description='Average')
+    GradeRange.objects.using(db).create(system=default_system, order=4, lower_limit=60,
+                              upper_limit=75, grade='B', description='Satisfactory')
+    GradeRange.objects.using(db).create(system=default_system, order=5, lower_limit=75,
+                              upper_limit=90, grade='A', description='Good')
+    GradeRange.objects.using(db).create(system=default_system, order=6, lower_limit=90,
+                              upper_limit=101, grade='A+', description='Excellent')
+
+
+def delete_default_system(apps, schema_editor):
+    GradingSystem = apps.get_model('grades', 'GradingSystem')
+    GradeRange = apps.get_model('grades', 'GradeRange')
+    db = schema_editor.connection.alias
+
+    default_system = GradingSystem.objects.using(db).get(creator=None)
+    GradeRange.object.using(db).filter(system=default_system).delete()
+    default_system.delete()
+
+
+class Migration(migrations.Migration):
+    dependencies = [('grades', '0001_initial'),]
+    operations = [migrations.RunPython(create_default_system, delete_default_system),]