from rest_framework import serializers
from core.apps.evaluation.models import CertificateModel


class BaseCertificateSerializer(serializers.ModelSerializer):
    file = serializers.SerializerMethodField(method_name='get_file', read_only=True)

    class Meta:
        model = CertificateModel
        fields = [
            "id",
            "title",
            "file",
        ]

    def get_file(self, obj):
        if obj.file:
            request = self.context.get('request')
            return request.build_absolute_uri(obj.file.url)
        return None


class CreateCertificateSerializer(serializers.ModelSerializer):
    class Meta:
        model = CertificateModel
        fields = [
            "id",
            "title",
            "file",
        ]