ТипError: «Обязательный» объект не является итерируемым. Флаконы WTF Forms

Question

Я следую http://code.tutsplus.com/tutorials/intro-to-flask-signing-in-and-out--net-29982 учебным пособиям по разработке собственного приложения.

Я попытался создать signupform но столкнулся с этой ошибкой:

TypeError: 'Required' object is not iterable 

Моей страница маршрутов

from cafe_klatch import app 
from flask import render_template,request,flash 
from forms import ContactForm, SignupForm 
from models import db 


@app.route('/') 
@app.route('/index') 

def index(): 
    return render_template('index.html') 

@app.route('/contact', methods = ['GET','POST']) 

def contact(): 
    form1 = ContactForm() 

    if request.method == 'POST': 
     if form.validate() == False: 
      flash('All fields are required.') 
      return render_template('contact.html',form = form) 
     else: 
      return 'Form posted.'  
    elif request.method == 'GET': 
     return render_template('contact.html',form = form) 


@app.route('/signup', methods =['GET','POST']) 

def signup(): 
    form = SignupForm() 

    if request.method == 'POST': 
     if form.validate() == False: 
      return render_template('signup.html',form = form) 
     else: 
      return "[1] Create a new user [2] Sign in the user [3] redirect to the user's profile" 

    elif request.method == 'GET': 
     return render_template('signup.html',form = form)   

Это мой models.py код

from flask.ext.sqlalchemy import SQLAlchemy 
from werkzeug import generate_password_hash, check_password_hash 

db = SQLAlchemy() 

class User(db.Model): 
    __tablename__ = 'users' 
    id = db.Column(db.Integer, primary_key = True) 
    userid = db.Column(db.String(30), unique = True) 
    email = db.Column(db.String(100), unique = True) 
    pwdhash = db.Column(db.String(100)) 
    birthdate = db.Column(db.DateTime) 
    zipcode = db.Column(db.Integer) 
    country = db.Column(db.String(100)) 

    def __init__(self,userid,email,password,birthdate,zipcode,country): 
     self.userid = userid.title() 
     self.email = email.lower() 
     self.set_password(password) 
     self.birthdate = birthdate 
     self.zipcode = zipcode 
     self.country = country 

    def __repr__(self): 
      return '<User %r>' % self.username  

    def set_password(self,password): 
     self.pwdhash = generate_password_hash(password) 

    def check_password(self,password): 
     return check_password(self.pwdhash, password)    

Это мой форм.py

from flask.ext.wtf import Form 
from wtforms import TextField, TextAreaField, SubmitField, IntegerField, validators, ValidationError,PasswordField, DateField 
from models import db, User 
class ContactForm(Form): 
    name = TextField("Name", [validators.Required("Please enter your name.")]) 
    email = TextField("Email", [validators.Required("Please enter your email address."), validators.Email("Please enter your email address.")]) 
    subject = TextField("Subject", [validators.Required("Please enter a subject.")]) 
    message = TextAreaField("Message", [validators.Required("Please enter a message.")]) 
    submit = SubmitField("Send") 

class SignupForm(Form): 
    userid = TextField("userid", [validators.Required("Please enter your user id")]) 
    email = TextField("Email", [validators.Required("Please enter your email address."), validators.Email("Please enter your email address.")]) 
    password = PasswordField('Password', [validators.Required("Please enter a password.")]) 
    birthdate = DateField("Birthdate",validators.Required("Please Enter your birthdate")) 
    zipcode = IntegerField("Zipcode",[validators.Required("Please Enter your zipcode")]) 
    country = TextField("country", [validators.Required("Please enter your country")]) 
    submit = SubmitField("Create account") 

    def __init__(self, *args, **kwargs): 
     Form.__init__(self, *args, **kwargs) 

    def validate(self): 
     if not Form.validate(self): 
      return False 

     user = User.query.filter_by(email = self.email.data.lower()).first() 
     if user: 
      self.email.errors.append("That email is already taken") 
      return False 
     else: 
      return True  

Может ли кто-нибудь объяснить, где ошибка?

Answer 1

Вы должны передать список валидаторов, но вам не хватает своего [ ... ] в объявлении birthdate поля в SignupForm. Он должен гласить:

birthdate = DateField("Birthdate", 
    [validators.Required("Please Enter your birthdate")])