查询指定课程评论接口

1.1 course/urls.py 中还是查询课程的路由

router.register(r'course', views.CourseViewSet)

1.2 course/serializers.py 中添加评论相关查询

from goods.serializers import GoodsSerializer
class CourseDeepSerializer(CourseSerializer):
    comment = CommentSerializer(many=True)



class CommentSerializer(serializers.ModelSerializer):
    user = serializers.CharField(source='user.username')
    to_user = serializers.SerializerMethodField(required=False)

    class Meta:
        model = Comment
        fields = '__all__'

    def get_to_user(self,row):
        if row.to_user:
            return row.to_user.username
        return ''