The WTForms example in the documentation shows how to bind form
variables to an object:
user = User(form.username.data, form.email.data,
form.password.data)
WTForms also has a convenience method, populate_obj, which does the same:
user = User()
form.populate_obj(user)
http://wtforms.simplecodes.com/docs/0.6/forms.html#wtforms.form.Form.populate_obj