Added relationship between subjects and student

infotech/subjects/migrations/0004_remove_subject_enrolled_count_subjectstudent_and_more.py

@@ -0,0 +1,34 @@
+# Generated by Django 4.2 on 2023-04-11 15:10
+
+from django.db import migrations, models
+import django.db.models.deletion
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('students', '0003_remove_student_enrolled_subjects'),
+        ('subjects', '0003_subject_semester'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='subject',
+            name='enrolled_count',
+        ),
+        migrations.CreateModel(
+            name='SubjectStudent',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('date_joined', models.DateTimeField(default=django.utils.timezone.now, editable=False)),
+                ('student_assigned', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='students.student')),
+                ('subject', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='subjects.subject')),
+            ],
+        ),
+        migrations.AddField(
+            model_name='subject',
+            name='students',
+            field=models.ManyToManyField(related_name='SubjectStudent_student_assigned', through='subjects.SubjectStudent', to='students.student'),
+        ),
+    ]

infotech/subjects/models.py

@@ -1,5 +1,6 @@
 from django.db import models
 from django.core.validators import MaxValueValidator, MinValueValidator
+from django.utils.timezone import now
 # Create your models here.
 
 
@@ -15,16 +16,20 @@ class Subject(models.Model):
         SECOND_SEM = 'Sem-2', '2nd Semester'
 
     name = models.CharField(max_length=40)
-    enrolled_count = models.IntegerField(
-        default=0,
-        validators=[
-            MaxValueValidator(60),
-            MinValueValidator(0)
-        ])
     max_slots = models.IntegerField(default=60)
     year_level = models.CharField(max_length=20, choices=YearLevels.choices)
     semester = models.CharField(
         max_length=20, choices=Semesters.choices, default=Semesters.FIRST_SEM)
 
+    students = models.ManyToManyField(
+        'students.Student', related_name='SubjectStudent_student_assigned', through='subjects.SubjectStudent')
+
     def __str__(self):
         return self.name
+
+
+class SubjectStudent(models.Model):
+    subject = models.ForeignKey('subjects.Subject', on_delete=models.CASCADE)
+    student_assigned = models.ForeignKey(
+        'students.Student', on_delete=models.CASCADE, null=True)
+    date_joined = models.DateTimeField(default=now, editable=False)

infotech/subjects/serializers.py

@@ -1,13 +1,15 @@
 from rest_framework import serializers
 from django.contrib.auth.models import User
 from .models import Subject
+from students.models import Student
 
 
 class SubjectSerializer(serializers.HyperlinkedModelSerializer):
-    enrolled_count = serializers.IntegerField(required=False, default=0)
+    students = serializers.SlugRelatedField(
+        queryset=Student.objects.all(), many=True, slug_field='full_name', allow_null=True)
 
     class Meta:
         model = Subject
-        fields = ('id', 'name', 'enrolled_count',
+        fields = ('id', 'name', 'students',
                   'max_slots', 'year_level', 'semester')
         read_only_fields = ('id',)