在烧瓶中添加对peewee模型的验证

from peewee import *

db = SqliteDatabase('my_app.db')

class User(Model):
    username = CharField(unique=True)
    email = CharField()
    password = CharField()

    class Meta:
        database = db

from peewee import *

db = SqliteDatabase('my_app.db')

class User(Model):
    username = CharField(unique=True)
    email = CharField()
    password = CharField()

    def validate_username(self, value):
        # 自定义验证规则，例如检查用户名是否符合要求
        if len(value) < 6:
            raise ValueError('Username must be at least 6 characters long.')

    class Meta:
        database = db

from flask import Flask, request
from peewee import *

app = Flask(__name__)
db = SqliteDatabase('my_app.db')

class User(Model):
    username = CharField(unique=True)
    email = CharField()
    password = CharField()

    def validate_username(self, value):
        if len(value) < 6:
            raise ValueError('Username must be at least 6 characters long.')

    class Meta:
        database = db

@app.route('/register', methods=['POST'])
def register():
    username = request.form.get('username')
    email = request.form.get('email')
    password = request.form.get('password')

    try:
        user = User(username=username, email=email, password=password)
        user.save()
        return 'Registration successful.'
    except ValueError as e:
        return str(e)

if __name__ == '__main__':
    app.run()