feat: update models and respective entries in assignments app

Add passing_score field to Assignments model.
Create new model "Course" and its admin.

Add relationship between Assignment and Course models.

widget_group_6/assignments/admin.py

 from django.contrib import admin
 
 # Register your models here.
-from .models import Assignment
+from .models import Assignment, Course
 
 class AssignmentAdmin(admin.ModelAdmin):
     model = Assignment
 
+class CourseAdmin(admin.ModelAdmin):
+    model = Course
+
 admin.site.register(Assignment, AssignmentAdmin)
+admin.site.register(Course, CourseAdmin)
\ No newline at end of file

widget_group_6/assignments/migrations/0001_initial.py

+# Generated by Django 4.0.3 on 2022-03-20 18:24
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Assignment',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=50)),
+                ('description', models.CharField(max_length=200)),
+                ('max_points', models.IntegerField()),
+            ],
+        ),
+    ]

widget_group_6/assignments/migrations/0002_auto_20220330_2257.py

+# Generated by Django 3.2.12 on 2022-03-30 14:57
+
+import django.core.validators
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assignments', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Course',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('course_code', models.CharField(max_length=10)),
+                ('course_title', models.CharField(max_length=100)),
+                ('section', models.SlugField(max_length=3, validators=[django.core.validators.RegexValidator('^[a-zA-Z]*$')])),
+            ],
+        ),
+        migrations.AddField(
+            model_name='assignment',
+            name='course',
+            field=models.ForeignKey(default=None, null=True, on_delete=django.db.models.deletion.CASCADE, to='assignments.course'),
+        ),
+    ]

widget_group_6/assignments/models.py

+from pyexpat import model
 from django.db import models
+from  django.core.validators import RegexValidator
 
 # Create your models here.
+class Course(models.Model):
+    course_code = models.CharField(max_length=10)
+    course_title = models.CharField(max_length=100)
+    section = models.SlugField(
+        max_length=3, 
+        validators=[RegexValidator(r'^[a-zA-Z]*$')]
+        )
+
+    def __str__(self):
+        return self.course_code + " - " + self.course_title 
+
 class Assignment(models.Model):
     name = models.CharField(max_length=50)
     description = models.CharField(max_length=200)
     max_points = models.IntegerField()
+    course = models.ForeignKey(
+        'Course', 
+        on_delete=models.CASCADE, 
+        default=None, 
+        null=True
+        )
 
     def __str__(self):
         return self.name
     
+    @property
+    def passing_score(self):
+        return int(self.max_points*0.6)