ks/apps/examination/examquestion/serializers.py

# coding=utf-8
from rest_framework import serializers
from .models import *

class ExamQuestionSerializer(serializers.ModelSerializer):
    subject = serializers.CharField(source='chapter.subject.id', read_only=True)
    create_user_text = serializers.CharField(source='create_user.username', read_only=True)
    type_text = serializers.CharField(source='get_type_display', read_only=True)
    difficulty_text = serializers.CharField(source='get_difficulty_display', read_only=True)

    class Meta:
        model = ExamQuestion
        fields = '__all__'

    def create(self, validated_data):
        validated_data['create_user'] = self.context['request'].user
        instance = super(ExamQuestionSerializer, self).create(validated_data)
        return instance