在MongoDB中将WTForms解析为数组

from wtforms import Form, StringField, PasswordField, FieldList

class RegistrationForm(Form):
    username = StringField('Username')
    password = PasswordField('Password')
    interests = FieldList(StringField('Interest'))

from flask import Flask, request
from pymongo import MongoClient

app = Flask(__name__)
client = MongoClient('mongodb://localhost:27017/')
db = client['mydatabase']

@app.route('/register', methods=['POST'])
def register():
    form = RegistrationForm(request.form)
    if form.validate():
        user_data = {
            'username': form.username.data,
            'password': form.password.data,
            'interests': form.interests.data
        }
        db.users.insert_one(user_data)
        return 'Registration successful'
    else:
        return 'Invalid form data'