Overhauled the entire subjects app to be more simplified and to remove anomalies when filtering in queries

stude/accounts/migrations/0001_initial.py

@@ -1,9 +1,10 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 import accounts.models
 import django.contrib.auth.models
 import django.contrib.auth.validators
 from django.db import migrations, models
+import django.db.models.deletion
 import django.utils.timezone
 
 
@@ -12,6 +13,9 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
+        ('courses', '0001_initial'),
+        ('auth', '0012_alter_user_first_name_max_length'),
+        ('semesters', '0001_initial'),
     ]
 
     operations = [
@@ -34,6 +38,9 @@ class Migration(migrations.Migration):
                 ('is_banned', models.BooleanField(default=False)),
                 ('student_id_number', models.CharField(max_length=16, validators=[accounts.models.validate_student_id])),
                 ('avatar', models.ImageField(null=True, upload_to=accounts.models.CustomUser._get_upload_to)),
+                ('course', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='courses.course')),
+                ('groups', models.ManyToManyField(blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of their groups.', related_name='user_set', related_query_name='user', to='auth.group', verbose_name='groups')),
+                ('semester', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='semesters.semester')),
             ],
             options={
                 'verbose_name': 'user',

stude/accounts/migrations/0002_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 from django.db import migrations, models
 import django.db.models.deletion
@@ -9,34 +9,17 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        ('auth', '0012_alter_user_first_name_max_length'),
         ('year_levels', '0001_initial'),
-        ('accounts', '0001_initial'),
-        ('semesters', '0001_initial'),
-        ('courses', '0002_initial'),
         ('subjects', '0001_initial'),
+        ('accounts', '0001_initial'),
+        ('auth', '0012_alter_user_first_name_max_length'),
     ]
 
     operations = [
-        migrations.AddField(
-            model_name='customuser',
-            name='course',
-            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='courses.course'),
-        ),
-        migrations.AddField(
-            model_name='customuser',
-            name='groups',
-            field=models.ManyToManyField(blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of their groups.', related_name='user_set', related_query_name='user', to='auth.group', verbose_name='groups'),
-        ),
-        migrations.AddField(
-            model_name='customuser',
-            name='semester',
-            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='semesters.semester'),
-        ),
         migrations.AddField(
             model_name='customuser',
             name='subjects',
-            field=models.ManyToManyField(to='subjects.subject'),
+            field=models.ManyToManyField(to='subjects.subjectinstance'),
         ),
         migrations.AddField(
             model_name='customuser',

stude/accounts/models.py

@@ -53,7 +53,7 @@ class CustomUser(AbstractUser):
         on_delete=models.SET_NULL,
         null=True
     )
-    subjects = models.ManyToManyField('subjects.Subject')
+    subjects = models.ManyToManyField('subjects.SubjectInstance')
 
     @property
     def full_name(self):

stude/courses/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 from django.db import migrations, models
 
@@ -15,8 +15,8 @@ class Migration(migrations.Migration):
             name='Course',
             fields=[
                 ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('name', models.CharField(max_length=64)),
+                ('name', models.CharField(max_length=64, unique=True)),
-                ('shortname', models.CharField(max_length=16)),
+                ('shortname', models.CharField(max_length=16, unique=True)),
             ],
         ),
     ]

stude/courses/migrations/0002_initial.py

@@ -1,21 +0,0 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    initial = True
-
-    dependencies = [
-        ('courses', '0001_initial'),
-        ('subjects', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='course',
-            name='subjects',
-            field=models.ManyToManyField(related_name='SubjectCourse_course', through='subjects.SubjectCourse', to='subjects.subject'),
-        ),
-    ]

stude/courses/migrations/0003_alter_course_name_alter_course_shortname.py

@@ -1,23 +0,0 @@
-# Generated by Django 4.2.3 on 2023-07-18 10:28
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('courses', '0002_initial'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='course',
-            name='name',
-            field=models.CharField(max_length=64, unique=True),
-        ),
-        migrations.AlterField(
-            model_name='course',
-            name='shortname',
-            field=models.CharField(max_length=16, unique=True),
-        ),
-    ]

stude/courses/models.py

@@ -9,8 +9,6 @@ from django.db import models
 class Course(models.Model):
     name = models.CharField(max_length=64, unique=True)
     shortname = models.CharField(max_length=16, unique=True)
-    subjects = models.ManyToManyField(
-        'subjects.Subject', related_name='SubjectCourse_course', through='subjects.SubjectCourse')
 
     def __str__(self):
         return self.name

stude/landmarks/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 import django.contrib.gis.db.models.fields
 from django.db import migrations, models

stude/semesters/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 from django.db import migrations, models
 
@@ -15,8 +15,8 @@ class Migration(migrations.Migration):
             name='Semester',
             fields=[
                 ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('name', models.CharField(max_length=64)),
+                ('name', models.CharField(max_length=64, unique=True)),
-                ('shortname', models.CharField(max_length=16)),
+                ('shortname', models.CharField(max_length=16, unique=True)),
             ],
         ),
     ]

stude/semesters/migrations/0002_alter_semester_name_alter_semester_shortname.py

@@ -1,23 +0,0 @@
-# Generated by Django 4.2.3 on 2023-07-18 10:28
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('semesters', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='semester',
-            name='name',
-            field=models.CharField(max_length=64, unique=True),
-        ),
-        migrations.AlterField(
-            model_name='semester',
-            name='shortname',
-            field=models.CharField(max_length=16, unique=True),
-        ),
-    ]

stude/student_status/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 from django.conf import settings
 import django.contrib.gis.db.models.fields
@@ -11,8 +11,8 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        ('accounts', '0002_initial'),
         ('landmarks', '0001_initial'),
+        ('accounts', '0002_initial'),
     ]
 
     operations = [

stude/student_status/migrations/0002_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 from django.db import migrations, models
 import django.db.models.deletion
@@ -9,8 +9,8 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        ('study_groups', '0001_initial'),
         ('student_status', '0001_initial'),
+        ('study_groups', '0001_initial'),
         ('subjects', '0001_initial'),
     ]
 

stude/study_groups/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 import django.contrib.gis.db.models.fields
 from django.db import migrations, models

stude/study_groups/views.py

@@ -4,7 +4,7 @@ from rest_framework.exceptions import PermissionDenied
 from rest_framework.permissions import IsAuthenticated
 from .serializers import StudyGroupSerializer
 from .models import StudyGroup
-from subjects.models import SubjectCourse
+from subjects.models import SubjectInstance
 # Create your views here.
 
 
@@ -24,15 +24,16 @@ class StudyGroupListView(generics.ListAPIView):
         # Get the user's course
         user_course = user.course
         print(user_course)
-        # Get subject ids related to the user's course through SubjectCourse
+
-        subject_ids = SubjectCourse.objects.filter(
+        # Get subject names related to the user's course
+        subject_names = SubjectInstance.objects.filter(
             course=user_course
         ).values_list('subject', flat=True)
 
-        print(subject_ids)
+        print(subject_names)
 
-        # Now fetch the StudyGroups with the subjects from the obtained subject_ids
+        # Now fetch the StudyGroups with the matching subject names
-        studygroups = StudyGroup.objects.filter(subject_id__in=subject_ids)
+        studygroups = StudyGroup.objects.filter(subject_name__in=subject_names)
         return studygroups
 
 

stude/studygroup_messages/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 from django.conf import settings
 from django.db import migrations, models
@@ -10,8 +10,8 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
         ('study_groups', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
     ]
 
     operations = [

stude/subjects/admin.py

@@ -1,12 +1,6 @@
 from django.contrib import admin
-from .models import Subject, SubjectCourse, SubjectSemester, SubjectYearLevel
+from .models import Subject, SubjectCode, SubjectInstance
 
-
+admin.site.register(Subject)
-class SubjectAdmin(admin.ModelAdmin):
+admin.site.register(SubjectInstance)
-    filter_horizontal = ['courses']
+admin.site.register(SubjectCode)
-
-
-admin.site.register(Subject, SubjectAdmin)
-admin.site.register(SubjectCourse)
-admin.site.register(SubjectSemester)
-admin.site.register(SubjectYearLevel)

stude/subjects/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 from django.conf import settings
 from django.db import migrations, models
@@ -10,10 +10,10 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        ('semesters', '0001_initial'),
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
         ('courses', '0001_initial'),
         ('year_levels', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('semesters', '0001_initial'),
     ]
 
     operations = [
@@ -21,52 +21,26 @@ class Migration(migrations.Migration):
             name='Subject',
             fields=[
                 ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('name', models.CharField(max_length=64)),
+                ('name', models.CharField(max_length=64, unique=True)),
-                ('code', models.CharField(max_length=16)),
             ],
         ),
         migrations.CreateModel(
-            name='SubjectYearLevel',
+            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.CreateModel(
+            name='SubjectInstance',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('code', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='subjects.subjectcode')),
+                ('course', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='courses.course')),
+                ('semester', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='semesters.semester')),
+                ('students', models.ManyToManyField(blank=True, to=settings.AUTH_USER_MODEL)),
                 ('subject', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='subjects.subject')),
                 ('year_level', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='year_levels.year_level')),
             ],
         ),
-        migrations.CreateModel(
-            name='SubjectSemester',
-            fields=[
-                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('semester', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='semesters.semester')),
-                ('subject', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='subjects.subject')),
-            ],
-        ),
-        migrations.CreateModel(
-            name='SubjectCourse',
-            fields=[
-                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('course', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='courses.course')),
-                ('subject', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='subjects.subject')),
-            ],
-        ),
-        migrations.AddField(
-            model_name='subject',
-            name='courses',
-            field=models.ManyToManyField(related_name='SubjectCourse_subject', through='subjects.SubjectCourse', to='courses.course'),
-        ),
-        migrations.AddField(
-            model_name='subject',
-            name='semesters',
-            field=models.ManyToManyField(related_name='SubjectSemester_subject', through='subjects.SubjectSemester', to='semesters.semester'),
-        ),
-        migrations.AddField(
-            model_name='subject',
-            name='students',
-            field=models.ManyToManyField(to=settings.AUTH_USER_MODEL),
-        ),
-        migrations.AddField(
-            model_name='subject',
-            name='year_levels',
-            field=models.ManyToManyField(related_name='SubjectYearLevel_subject', through='subjects.SubjectYearLevel', to='year_levels.year_level'),
-        ),
     ]

stude/subjects/migrations/0002_alter_subject_code_alter_subject_name_and_more.py

@@ -1,76 +0,0 @@
-# Generated by Django 4.2.3 on 2023-07-18 10:28
-
-from django.conf import settings
-from django.db import migrations, models
-import django.db.models.deletion
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('year_levels', '0002_alter_year_level_name_alter_year_level_shortname'),
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
-        ('courses', '0003_alter_course_name_alter_course_shortname'),
-        ('semesters', '0002_alter_semester_name_alter_semester_shortname'),
-        ('subjects', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='subject',
-            name='code',
-            field=models.CharField(max_length=16, unique=True),
-        ),
-        migrations.AlterField(
-            model_name='subject',
-            name='name',
-            field=models.CharField(max_length=64, unique=True),
-        ),
-        migrations.AlterField(
-            model_name='subject',
-            name='students',
-            field=models.ManyToManyField(blank=True, to=settings.AUTH_USER_MODEL),
-        ),
-        migrations.AlterField(
-            model_name='subjectcourse',
-            name='course',
-            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='courses.course', to_field='name'),
-        ),
-        migrations.AlterField(
-            model_name='subjectcourse',
-            name='subject',
-            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='subjects.subject', to_field='name'),
-        ),
-        migrations.AlterField(
-            model_name='subjectsemester',
-            name='semester',
-            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='semesters.semester', to_field='name'),
-        ),
-        migrations.AlterField(
-            model_name='subjectsemester',
-            name='subject',
-            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='subjects.subject', to_field='name'),
-        ),
-        migrations.AlterField(
-            model_name='subjectyearlevel',
-            name='subject',
-            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='subjects.subject', to_field='name'),
-        ),
-        migrations.AlterField(
-            model_name='subjectyearlevel',
-            name='year_level',
-            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='year_levels.year_level', to_field='name'),
-        ),
-        migrations.AlterUniqueTogether(
-            name='subjectcourse',
-            unique_together={('subject', 'course')},
-        ),
-        migrations.AlterUniqueTogether(
-            name='subjectsemester',
-            unique_together={('subject', 'semester')},
-        ),
-        migrations.AlterUniqueTogether(
-            name='subjectyearlevel',
-            unique_together={('subject', 'year_level')},
-        ),
-    ]

stude/subjects/migrations/0003_subjectcode_remove_subject_code_subject_code.py

@@ -1,29 +0,0 @@
-# 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

@@ -1,18 +0,0 @@
-# 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',
-        ),
-    ]

stude/subjects/models.py

@@ -6,29 +6,16 @@ from django.db import models
 from django.db.models.signals import post_migrate
 from django.dispatch import receiver
 from courses.models import Course
+from accounts.models import CustomUser
 from year_levels.models import Year_Level
 from semesters.models import Semester
-# Create your models here.
 
 
 class Subject(models.Model):
     name = models.CharField(max_length=64, unique=True)
-    codes = models.ManyToManyField(
-        'subjects.SubjectCode')
-    courses = models.ManyToManyField(
-        'courses.Course', through='subjects.SubjectCourse', related_name='SubjectCourse_subject')
-    students = models.ManyToManyField(
-        'accounts.CustomUser', blank=True)
-
-    year_levels = models.ManyToManyField(
-        'year_levels.Year_Level', through='subjects.SubjectYearLevel', related_name='SubjectYearLevel_subject')
-
-    semesters = models.ManyToManyField(
-        'semesters.Semester', through='subjects.SubjectSemester', related_name='SubjectSemester_subject')
 
     def __str__(self):
-        code_list = ', '.join(self.codes.values_list('code', flat=True))
+        return f'{self.name}'
-        return f'{self.name} ({code_list})'
 
 
 class SubjectCode(models.Model):
@@ -38,46 +25,27 @@ class SubjectCode(models.Model):
         return self.code
 
 
-class SubjectCourse(models.Model):
+class SubjectInstance(models.Model):
     subject = models.ForeignKey(
-        'subjects.Subject', on_delete=models.CASCADE, to_field='name')
+        'subjects.Subject', on_delete=models.CASCADE)
+    students = models.ManyToManyField(
+        CustomUser, blank=True)
+    code = models.ForeignKey(
+        SubjectCode, on_delete=models.CASCADE)
     course = models.ForeignKey(
-        'courses.Course', on_delete=models.CASCADE, null=True, to_field='name')
+        Course, on_delete=models.CASCADE)
-
-    def __str__(self):
-        return f'Subject={self.subject.name}, Course={self.course.name}'
-
-    class Meta:
-        unique_together = [['subject', 'course']]
-
-
-class SubjectYearLevel(models.Model):
-    subject = models.ForeignKey(
-        'subjects.Subject', on_delete=models.CASCADE, to_field='name')
     year_level = models.ForeignKey(
-        'year_levels.Year_Level', on_delete=models.CASCADE, to_field='name')
+        Year_Level, on_delete=models.CASCADE)
-
-    def __str__(self):
-        return f'Subject={self.subject.name}, Year Level={self.year_level.name}'
-
-    class Meta:
-        unique_together = [['subject', 'year_level']]
-
-
-class SubjectSemester(models.Model):
-    subject = models.ForeignKey(
-        'subjects.Subject', on_delete=models.CASCADE, to_field='name')
     semester = models.ForeignKey(
-        'semesters.Semester', on_delete=models.CASCADE, to_field='name')
+        Semester, on_delete=models.CASCADE)
 
     def __str__(self):
-        return f'Subject={self.subject.name}, Semester={self.semester.name}'
+        return f'Subject: {self.name}({self.code}) - {self.course.shortname} - {self.year_level} - {self.semester}'
-
-    class Meta:
-        unique_together = [['subject', 'semester']]
 
 
 # Create subjects on initial migrate
+
+
 @receiver(post_migrate)
 def populate_subjects(sender, **kwargs):
     if sender.name == 'subjects':
@@ -130,37 +98,35 @@ def populate_subjects(sender, **kwargs):
                     semester = Semester.objects.filter(
                         name=subject_semester).first()
 
-                    # If subject already exists with relevant info, skip over it
+                    # If Subject exists
-                    if (Subject.objects.filter(name=subject_name, year_levels=year_level, semesters=semester).exists()):
-                        # print('Duplicate subject')
-                        existing_subjects += 1
-                        continue
-
-                    # Else if subject exists without relevant info, add relevant info
                     if (Subject.objects.filter(name=subject_name).exists()):
-                        SUBJECT = Subject.objects.filter(name=subject_name
-                                                         ).first()
 
-                        SUBJECT.courses.add(course)
+                        # If subject instance exists, skip over
-                        SUBJECT.year_levels.add(year_level)
+                        if (SubjectInstance.objects.filter(subject__name=subject_name, year_level=year_level, semester=semester).exists()):
-                        SUBJECT.semesters.add(semester)
+                            # print('Duplicate subject')
-                        SUBJECT_CODE = SubjectCode.objects.get_or_create(
+                            existing_subjects += 1
-                            code=subject_code)
+                            continue
-                        SUBJECT.codes.add(SUBJECT_CODE[0])
+
-                        updated_subjects += 1
+                        # If no subject instance exists, create one
+                        else:
+                            SUBJECT = Subject.objects.filter(
+                                name=subject_name).first()
+                            SUBJECT_CODE, created = SubjectCode.objects.get_or_create(
+                                code=subject_code)
+                            SUBJECT_INSTANCE = SubjectInstance.objects.get_or_create(
+                                subject=SUBJECT, course=course, year_level=year_level, semester=semester, code=SUBJECT_CODE)
+                            updated_subjects += 1
 
                     # If subject does not exist at all, then create new subject
                     else:
 
-                        SUBJECT = Subject.objects.get_or_create(
+                        SUBJECT, created = Subject.objects.get_or_create(
                             name=subject_name,
                         )
-                        SUBJECT[0].courses.set([course])
+                        SUBJECT_CODE, created = SubjectCode.objects.get_or_create(
-                        SUBJECT[0].year_levels.set([year_level])
-                        SUBJECT[0].semesters.set([semester])
-                        SUBJECT_CODE = SubjectCode.objects.get_or_create(
                             code=subject_code)
-                        SUBJECT[0].codes.add(SUBJECT_CODE[0])
+                        SUBJECT_INSTANCE = SubjectInstance.objects.get_or_create(
+                            subject=SUBJECT, course=course, year_level=year_level, semester=semester, code=SUBJECT_CODE)
                         subject_count += 1
 
                     # Set the course, year level, and semester of the subject

stude/subjects/serializers.py

@@ -1,21 +1,29 @@
 from rest_framework import serializers
-from .models import Subject, SubjectCode
+from .models import Subject, SubjectInstance, SubjectCode
 from courses.models import Course
 from year_levels.models import Year_Level
 from semesters.models import Semester
-from accounts.models import CustomUser
 
 
 class SubjectSerializer(serializers.ModelSerializer):
-    year_levels = serializers.SlugRelatedField(
-        queryset=Year_Level.objects.all(), many=True, slug_field='name', allow_null=True)
-    semesters = serializers.SlugRelatedField(
-        queryset=Semester.objects.all(), many=True, slug_field='name', allow_null=True)
-    courses = serializers.SlugRelatedField(
-        queryset=Course.objects.all(), many=True, slug_field='name', allow_null=True)
-    codes = serializers.SlugRelatedField(
-        queryset=SubjectCode.objects.all(), many=True, slug_field='code', allow_null=False)
 
     class Meta:
         model = Subject
-        fields = ('id', 'name', 'codes', 'courses', 'year_levels', 'semesters')
+        fields = '__all__'
+
+
+class SubjectInstanceSerializer(serializers.ModelSerializer):
+    subject = serializers.SlugRelatedField(
+        queryset=SubjectCode.objects.all(), slug_field='name', allow_null=False)
+    code = serializers.SlugRelatedField(
+        queryset=SubjectCode.objects.all(), slug_field='code', allow_null=False)
+    year_level = serializers.SlugRelatedField(
+        queryset=Year_Level.objects.all(), slug_field='name', allow_null=True)
+    semester = serializers.SlugRelatedField(
+        queryset=Semester.objects.all(), slug_field='name', allow_null=True)
+    course = serializers.SlugRelatedField(
+        queryset=Course.objects.all(), slug_field='name', allow_null=True)
+
+    class Meta:
+        model = SubjectInstance
+        fields = ('id', 'subject', 'code', 'course', 'year_level', 'semester')

stude/subjects/views.py

@@ -1,6 +1,6 @@
 from rest_framework import generics, viewsets
-from .models import Subject
+from .models import Subject, SubjectInstance
-from .serializers import SubjectSerializer
+from .serializers import SubjectSerializer, SubjectInstanceSerializer
 from rest_framework.views import APIView
 from rest_framework.response import Response
 
@@ -11,30 +11,27 @@ class SubjectListView(generics.ListAPIView):
 
 
 class SubjectByCourseView(generics.ListAPIView):
-    queryset = Subject.objects.all()
+    queryset = SubjectInstance.objects.all()
-    serializer_class = SubjectSerializer
+    serializer_class = SubjectInstanceSerializer
 
     def get(self, request, course_slug):
-        # Retrieve the subjects based on year level and semester slugs
+        # Retrieve the subjects based on course slug
-        subjects = Subject.objects.filter(
+        subjects = SubjectInstance.objects.filter(
-            courses__shortname=course_slug).distinct()
+            course__shortname=course_slug)
 
         # Serialize the subjects
-        serializer = SubjectSerializer(subjects, many=True)
+        serializer = SubjectInstanceSerializer(subjects, many=True)
-
         return Response(serializer.data)
 
 
 class SubjectByCourseYearSemesterView(generics.ListAPIView):
-    queryset = Subject.objects.all()
+    queryset = SubjectInstance.objects.all()
     serializer_class = SubjectSerializer
 
     def get(self, request, course_slug, year_slug, semester_slug):
         # Retrieve the subjects based on year level and semester slugs
-        subjects = Subject.objects.filter(
+        subjects = SubjectInstance.objects.filter(
-            courses__shortname=course_slug, year_levels__shortname=year_slug, semesters__shortname=semester_slug).distinct()
+            course__shortname=course_slug, year_level__shortname=year_slug, semester__shortname=semester_slug)
-
         # Serialize the subjects
-        serializer = SubjectSerializer(subjects, many=True)
+        serializer = SubjectInstanceSerializer(subjects, many=True)
-
         return Response(serializer.data)

stude/year_levels/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2.3 on 2023-07-18 07:43
+# Generated by Django 4.2.3 on 2023-07-26 03:53
 
 from django.db import migrations, models
 
@@ -15,8 +15,8 @@ class Migration(migrations.Migration):
             name='Year_Level',
             fields=[
                 ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('name', models.CharField(max_length=64)),
+                ('name', models.CharField(max_length=64, unique=True)),
-                ('shortname', models.CharField(max_length=16)),
+                ('shortname', models.CharField(max_length=16, unique=True)),
             ],
         ),
     ]

stude/year_levels/migrations/0002_alter_year_level_name_alter_year_level_shortname.py

@@ -1,23 +0,0 @@
-# Generated by Django 4.2.3 on 2023-07-18 10:28
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('year_levels', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='year_level',
-            name='name',
-            field=models.CharField(max_length=64, unique=True),
-        ),
-        migrations.AlterField(
-            model_name='year_level',
-            name='shortname',
-            field=models.CharField(max_length=16, unique=True),
-        ),
-    ]