serializer.py

from dataclasses import field
from django.urls import reverse
from rest_framework import serializers


from .models import Student, Group, User
from studentregistration.models import Module, Registration


class UsernameHyperlinkedIdentityField(serializers.HyperlinkedIdentityField):
    def to_representation(self, value):
        username = value.user.username
        request = self.context.get("request")
        kwargs = {self.lookup_field: username}
        path = reverse(self.view_name, kwargs=kwargs)
        return request.build_absolute_uri(path)


class UserSerializer(serializers.ModelSerializer):
    password = serializers.CharField(write_only=True)

    class Meta:
        model = User
        fields = ["username", "email", "first_name", "last_name", "password"]

    def create(self, validated_data):
        password = validated_data.pop("password")
        user = User(**validated_data)
        user.set_password(password)
        user.save()
        return user


class StudentSerializer(serializers.HyperlinkedModelSerializer):
    course = serializers.SlugRelatedField(
        queryset=Group.objects.all(), slug_field="name"
    )
    email = serializers.ReadOnlyField(source="user.email")
    student_id = serializers.ReadOnlyField(source="user.username")
    url = UsernameHyperlinkedIdentityField(
        view_name="student-detail", lookup_field="username"
    )

    class Meta:
        model = Student
        fields = [
            "url",
            "student_id",
            "email",
            "address",
            "city",
            "country",
            "photo",
            "course",
        ]


class StudentRegistrationDetailsSerializer(serializers.Serializer):
    student = serializers.CharField()
    date = serializers.DateTimeField()


class ModuleSerializer(serializers.HyperlinkedModelSerializer):
    courses = serializers.SlugRelatedField(many=True, read_only=True, slug_field="name")
    url = serializers.HyperlinkedIdentityField(
        view_name="module-detail", lookup_field="code"
    )
    student_registration_details = StudentRegistrationDetailsSerializer(
        many=True, read_only=True
    )

    class Meta:
        model = Module
        fields = [
            "url",
            "name",
            "code",
            "credit",
            "category",
            "description",
            "available",
            "courses",
            "student_registration_details",
        ]


class CourseModules(serializers.HyperlinkedModelSerializer):
    url = serializers.HyperlinkedIdentityField(
        view_name="module-detail", lookup_field="code"
    )

    class Meta:
        model = Module

        fields = [
            "url",
            "name",
        ]


class CourseSerializer(serializers.HyperlinkedModelSerializer):
    modules = CourseModules(many=True, read_only=True)

    class Meta:
        model = Group
        fields = ["url", "id", "name", "modules"]


class ModuleRegistrationSerializer(serializers.HyperlinkedModelSerializer):
    url = serializers.HyperlinkedIdentityField(
        view_name="module-detail", lookup_field="code"
    )

    class Meta:
        model = Module
        fields = ["url", "name", "code", "credit"]


class StudentRegistrationSerializer(serializers.HyperlinkedModelSerializer):
    course = serializers.SlugRelatedField(
        queryset=Group.objects.all(), slug_field="name"
    )
    student_id = serializers.ReadOnlyField(source="user.username")
    url = UsernameHyperlinkedIdentityField(
        view_name="student-detail", lookup_field="username"
    )

    class Meta:
        model = Student
        fields = ["url", "student_id", "course"]


class RegistrationSerializer(serializers.HyperlinkedModelSerializer):
    module = ModuleRegistrationSerializer()
    student = StudentRegistrationSerializer()

    class Meta:
        model = Registration
        fields = ["url", "id", "student", "module", "registration_date"]