在QuerySelectField中设置默认值(由object初始化的表单)

from flask_wtf import FlaskForm
from wtforms import QuerySelectField

class MyForm(FlaskForm):
    my_field = QuerySelectField('My Field', query_factory=my_query_factory)

def my_query_factory():
    # 获取数据库中的记录，并返回查询对象
    query = MyModel.query

    # 设置默认值
    default_value = MyModel.query.filter_by(name='default').first()
    if default_value:
        query = query.filter(MyModel.id != default_value.id)

    return query

@app.route('/my_route', methods=['GET', 'POST'])
def my_route():
    form = MyForm()

    # 设置默认值
    default_value = MyModel.query.filter_by(name='default').first()
    if default_value:
        form.my_field.data = default_value

    # 处理表单提交
    if form.validate_on_submit():
        # 处理表单数据

    return render_template('my_template.html', form=form)