Worked out API's

university/admin.py

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+from django.contrib import admin
+from .models import University, Agreement, Section
+
+# Register your models here.
+admin.site.register(University)
+admin.site.register(Agreement)
+admin.site.register(Section)

university/apps.py

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+from django.apps import AppConfig
+
+
+class UniversityConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'university'

university/migrations/0001_initial.py

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+# Generated by Django 5.0.1 on 2024-06-10 02:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('classes', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Sections',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('area_name', models.CharField(max_length=200)),
+                ('classes', models.ManyToManyField(to='classes.classes')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Agreements',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('major', models.CharField(max_length=200)),
+                ('sections', models.ManyToManyField(to='university.sections')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='University',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=200)),
+                ('agreements', models.ManyToManyField(to='university.agreements')),
+            ],
+        ),
+    ]

university/migrations/0002_rename_agreements_agreement_rename_sections_section.py

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+# Generated by Django 5.0.1 on 2024-06-10 02:52
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('classes', '0001_initial'),
+        ('university', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RenameModel(
+            old_name='Agreements',
+            new_name='Agreement',
+        ),
+        migrations.RenameModel(
+            old_name='Sections',
+            new_name='Section',
+        ),
+    ]

university/migrations/0003_section_number_of_required_courses.py

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+# Generated by Django 5.0.1 on 2024-06-10 03:42
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('university', '0002_rename_agreements_agreement_rename_sections_section'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='section',
+            name='number_of_required_courses',
+            field=models.IntegerField(default=1),
+            preserve_default=False,
+        ),
+    ]

university/models.py

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+from django.db import models
+from classes.models import Classes
+
+class Section(models.Model):
+    area_name = models.CharField(max_length=200)
+    number_of_required_courses = models.IntegerField()
+    classes = models.ManyToManyField(Classes)
+
+    def __str__(self) -> str:
+        return self.area_name
+
+class Agreement(models.Model):
+    major = models.CharField(max_length=200)
+    sections = models.ManyToManyField(Section)
+
+    def __str__(self) -> str:
+        return self.major
+
+# Create your models here.
+class University(models.Model):
+    name = models.CharField(max_length=200)
+    agreements = models.ManyToManyField(Agreement)
+
+    def __str__(self) -> str:
+        return self.name

university/serializers.py

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+from rest_framework import serializers
+from .models import University, Agreement, Section
+
+class UniversitySerializer(serializers.ModelSerializer):
+
+    agreements = serializers.SlugRelatedField(
+        many = True,
+        read_only = True,
+        slug_field="major"
+    )
+
+    class Meta:
+        model = University
+        fields = ["name", "agreements"]
+
+class AgreementsSerializer(serializers.ModelSerializer):
+
+    sections = serializers.SlugRelatedField(
+        many = True,
+        read_only = True,
+        slug_field = "area_name"
+    )
+
+    class Meta:
+        model = Agreement
+        fields = ["major", "sections"]
+
+class SectionsSerializer(serializers.ModelSerializer):
+
+    classes = serializers.SlugRelatedField(
+        many = True,
+        read_only = True,
+        slug_field = "MJC_Class_Name"
+    )
+
+    class Meta:
+        model = Section
+        fields = ["area_name", "number_of_required_courses", "classes"]

university/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

university/urls.py

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+from django.urls import path
+from . import views
+
+urlpatterns = [
+    path("all_universities/", views.UniversityListCreate.as_view(), name="university-view-createlist"),
+    path("all_agreements/", views.AgreementsListCreate.as_view(), name="sections-view-createlist"),
+    path("all_sections/", views.SectionsListCreate.as_view(), name="sections-view-createlist"),
+    path("<str:name>", views.UniversityRetrieveUpdateDestroy.as_view(), name="university-update"),
+    path("<str:name>/<str:major>", views.AgreementRetrieveUpdateDestroy.as_view(), name="agreement-update"),
+    path("<str:name>/<str:major>/<str:area_name>", views.SectionRetrieveUpdateDestroy.as_view(), name="section-update"),
+]

university/views.py

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+from django.shortcuts import render
+from rest_framework import generics
+from .models import University, Agreement, Section
+from .serializers import UniversitySerializer, AgreementsSerializer, SectionsSerializer
+
+# Create your views here.
+class UniversityListCreate(generics.ListCreateAPIView):
+    queryset = University.objects.all()
+    serializer_class = UniversitySerializer
+
+class AgreementsListCreate(generics.ListCreateAPIView):
+    queryset = Agreement.objects.all()
+    serializer_class = AgreementsSerializer
+
+class SectionsListCreate(generics.ListCreateAPIView):
+    queryset =  Section.objects.all()
+    serializer_class = SectionsSerializer
+
+class UniversityRetrieveUpdateDestroy(generics.RetrieveUpdateDestroyAPIView):
+    queryset = University.objects.all()
+    serializer_class = UniversitySerializer
+    lookup_field = "name"
+
+class AgreementRetrieveUpdateDestroy(generics.RetrieveUpdateDestroyAPIView):
+    queryset = Agreement.objects.all()
+    serializer_class = AgreementsSerializer
+    lookup_field = "major"
+
+class SectionRetrieveUpdateDestroy(generics.RetrieveUpdateDestroyAPIView):
+    queryset = Section.objects.all()
+    serializer_class = SectionsSerializer
+    lookup_field = "area_name"