python之从模型 flask 、sqlalchamey 和 wtforms 创建表单

我收到此错误，但我不确定自己做错了什么。我创建的表格就像我从互联网上得到的例子一样。我按照这个例子 https://wtforms-alchemy.readthedocs.org/en/latest/introduction.html#quickstart

class User(db.Model): 
    __tablename__= 'users' 
 
    DRIVER = 'driver' 
    ADMIN = 'admin' 
 
    username = db.Column('username', db.String(80), primary_key=True) 
    _pw_hash = db.Column('pw_hash', db.String(128), nullable=False) 
    _pw_salt = db.Column('pw_salt', db.String(20), nullable=False) 
    first_name = db.Column('full_name', db.String(100), nullable=False) 
    last_name = db.Column('last_name', db.String(100), nullable=False) 
    email = db.Column('email', db.String(120)) 
    phone = db.Column('phone', db.String(20)) 
    #acct_type = db.Column('acct_type', db.Enum(DRIVER, ADMIN), nullable=False) 
 
    def check_pw(self, pw): 
        return self._pw_hash == util.pwhash(pw, self._pw_salt) 
 
    @property 
    def _pw_hash(self): 
        return self._pw_hash 
 
    @_pw_hash.setter 
    def password(self, pw): 
        self._pw_salt = util.salt(20) 
        self._pw_hash = util.pwhash(pw, self._pw_salt) 
 
 
    def __init__(self, un, pw, first, last, acct_type, email=None, phone=None): 
        self.username = un 
        self.password = pw 
        self.first_name = first 
        self.last_name = last 
        self.acct_type = acct_type 
        self.email = email 
        self.phone = phone 
 
UserFrom = model_form(User, base_class=Form, exclude=['_pw_hash']) 

错误:

Traceback (most recent call last): 
  File "/home/chase/workspace/T2T_Flask/model.py", line 1, in <module> 
    from t2t import app 
  File "/home/chase/workspace/T2T_Flask/t2t.py", line 4, in <module> 
    from model import * 
  File "/home/chase/workspace/T2T_Flask/model.py", line 48, in <module> 
    UserFrom = model_form(User, base_class=Form, exclude=['_pw_hash', 'username']) 
  File "/usr/local/lib/python3.4/dist-packages/wtforms/ext/appengine/db.py", line 460, in model_form 
    field_dict = model_fields(model, only, exclude, field_args, converter) 
  File "/usr/local/lib/python3.4/dist-packages/wtforms/ext/appengine/db.py", line 415, in model_fields 
    props = model.properties() 
AttributeError: type object 'User' has no attribute 'properties' 

请您参考如下方法:

您错误地使用了 appengine 自动表单，而不是 sqlalchemy 表单。查看回溯中的路径:wtforms/ext/appengine/db.py。你似乎也混淆了 wtforms-sqlalchemy extension provided by the WTForms project与单独的 WTForms-Alchemy包。

如果您想使用内置支持:

from wtforms.ext.sqlalchemy.orm import model_form 
 
UserForm = model_form(User, _exclude=['_pw_hash']) 

如果您想使用单独的 WTForms-Alchemy 包:

from wtforms_alchemy import ModelForm 
 
class UserForm(ModelForm): 
    class Meta: 
        model = User 
        exclude = ['_pw_hash']