如何使用Flask-AppBuilder使用自定义表单更改选择字段的默认选择？

Change my Flask app into a Flask-Appbuilder, and running into some issues. I am looking to change the default selection of a SelectField using the parameter in the url, kind of like the automatic forms do. From the following configuration, I get "/rooms/add?_flt_0_building=3" in the URL when the third building is selected. How can I get building_id in the WTForm to select his on the page?Change my Flask app into a Flask-Appbuilder, an