如何在Flask Admin上创建Ajax表单域

from flask import Flask, render_template
from flask_admin import Admin
from flask_admin.contrib.sqla import ModelView
from flask_admin.model.ajax import AjaxSelectField

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your_secret_key'
app.config['SQLALCHEMY_DATABASE_URI'] = 'your_database_uri'

db = SQLAlchemy(app)

class Category(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50))

class Product(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50))
    category_id = db.Column(db.Integer, db.ForeignKey('category.id'))
    category = db.relationship('Category', backref=db.backref('products', lazy='dynamic'))

class ProductView(ModelView):
    form_ajax_refs = {
        'category': {
            'fields': (Category.name,)
        }
    }

admin = Admin(app)
admin.add_view(ProductView(Product, db.session))

@app.route('/')
def index():
    return render_template('index.html')

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