from apps.utils.serializers import CustomModelSerializer
from rest_framework import serializers
from .models import Paper


class PaperListSerializer(CustomModelSerializer):
    abstract = serializers.SerializerMethodField()

    class Meta:
        model = Paper
        fields = '__all__'

    def get_abstract(self, obj) -> str:
        # PaperAbstract 是 O2O,related_name="abstract";无行 / has_abstract=False 时返空串
        abs_obj = getattr(obj, "abstract", None)
        if abs_obj is None:
            return ""
        return abs_obj.abstract or ""