有什么方法可以将一些特定字段从序列化程序获取到另一个序列化程序？

Question

I want all data from EmployeeLiteSerializer except designation data to BankInfoSerializer without detete get_designation_data method

 class EmployeeLiteSerializer(serializers.ModelSerializer):
        designation_data = serializers.SerializerMethodField(read_only=True)
    
        class Meta:
            model = Employee
            fields = ('first_name', 'last_name', 'code', 'designation_data')
    
        def get_designation_data(self, obj: Employee) -> Dict:
            try:
                return DesignationLiteSerializer(obj.designation).data
            except Designation.DoesNotExist:
                return {'message': 'No designation'}

    class BankInfoSerializer(serializers.ModelSerializer):
        employee = serializers.SerializerMethodField(read_only=True)
    
        class Meta:
            model = BankInfo
            fields = '__all__'
    
        def get_employee(self, obj: Employee) -> Dict:
            return EmployeeLiteSerializer(obj.employee).data

Answer 1

Use a new serializer for employee without designation_data .

# change the name to what you want
class BankInfoEmployeeSerializer(serializers.ModelSerializer):

    class Meta:
        model = Employee
        fields = ('first_name', 'last_name', 'code')


class BankInfoSerializer(serializers.ModelSerializer):
    employee = serializers.SerializerMethodField(read_only=True)

    class Meta:
        model = BankInfo
        fields = '__all__'

    def get_employee(self, obj: Employee) -> Dict:
        return BankInfoEmployeeSerializer(obj.employee).data

If employee is a field on BankInfo you can use it directly without SerializerMethodField

Answer 2

You can remove designation info:

class BankInfoSerializer(serializers.ModelSerializer):
    employee = serializers.SerializerMethodField(read_only=True)
    
    class Meta:
        model = BankInfo
        fields = '__all__'

    def get_employee(self, obj: Employee) -> Dict:
        employe_data = EmployeeLiteSerializer(obj.employee).data
        if 'designation_data' in employe_data:
            del employe_data['designation_data']
        
        return employe_data