以用户注册为例子

序列化器类设计

from django.contrib.auth.models import User
from rest_framework import serializers
from rest_framework.validators import UniqueValidator
from rest_framework_jwt.serializers import jwt_payload_handler, jwt_encode_handler


class RegisterModelSerializer(serializers.ModelSerializer):
    password_confirm = serializers.CharField(label='确认密码', help_text='确认密码',
                                             error_messages={"min_length": "允许输入5-20个字符",
                                                             "max_length": "允许输入5-20个字符", },
                                             write_only=True)
    token = serializers.CharField(label='token', help_text='token', read_only=True)

    class Meta:
        model = User
        fields = ['id', 'username', 'password', 'password_confirm', 'token', 'email']

        extra_kwargs = {
            "username": {
                "label": "用户名",
                "help_text": "用户名",
                "max_length": 20,
                "min_length": 5,
                "error_messages": {
                    "min_length": "允许输入5-20个字符",
                    "max_length": "允许输入5-20个字符",
                },
                "validators": [UniqueValidator(queryset=User.objects.all(), message='用户名已注册，请重新输入')]

            },
            "password": {
                "label": "密码",
                "help_text": "密码",
                "max_length": 20,
                "min_length": 5,
                "error_messages": {
                    "min_length": "允许输入5-20个字符",
                    "max_length": "允许输入5-20个字符",
                },
                "write_only": True
            },
            "email": {
                "label": "邮箱",
                "help_text": "邮箱",
                "max_length": 20,
                "min_length": 5,
                "required": True,
                "write_only": True,
                "validators": [UniqueValidator(queryset=User.objects.all(), message='邮箱已注册，请重新输入')]
            }
        }

    # 校验密码与验证码密码
    def validate(self, attrs):
        password = attrs.get('password')
        password_confirm = attrs.get('password_confirm')
        if password_confirm != password:
            raise serializers.ValidationError("密码和确认密码输入的不一致")
        return attrs

    def create_token(self, user):
        payload = jwt_payload_handler(user)
        return jwt_encode_handler(payload)

    # 校验通过之后，创建模型对象
    def create(self, validated_data):
        user = User.objects.create_user(username=validated_data.get('username'),
                                        password=validated_data.get('password'),
                                        email=validated_data.get('email'),
                                        )
        token = self.create_token(user)
        user.token = token
        return user