Flask self.errors.append() - AttributeError: 'tuple' 对象没有属性 'append'

Question

当我尝试验证用户提交的数据并检查输入的电子邮件是否存在时，我的小型注册应用程序出现错误。

这是我的文件：

形式：

 from flask.ext.wtf import Form
from wtforms import TextField, BooleanField, PasswordField, TextAreaField, validators
from wtforms.validators import Required
from app import models

class RegisterForm(Form):
"""RegisterForm class needed for retrieving data from user"""
username = TextField('username', [validators.Length(min=3, max=50), validators.Required()])
email = TextField('email', [validators.Length(min=3, max=100), validators.Required()])
password = PasswordField('password', [validators.Required()])
age = TextField('age', [validators.Length(min=1, max=3), validators.Required()])
about_user = TextAreaField('about_user', [validators.Length(max=500)])
img_url = TextField('img_url')

def email_unique(self, email):
    if models.User.query.filter_by(email = email).first() != None:
        self.email.errors.append('This E-mail address is already in use. Please choose another one.')
        return False

观点：

 #!flask/bin/python
from app import app, db, lm
from flask import render_template, url_for, flash, g, redirect, session, request
from flask.ext.login import login_user, logout_user, current_user, login_required
from forms import LoginForm, RegisterForm, EditForm
from models import User

@app.route('/register', methods = ['GET', 'POST'])
def register():
    form = RegisterForm()
    #makes the username unique
    u_unique =  form.username.data
    u_unique = User.unique_username(u_unique)

    #validates email adress and checks if it already exists or not
    form.email_unique(form.email.data)

    if form.validate_on_submit():
        user = User(
            u_unique,
            form.password.data,
            form.email.data,
            form.age.data,
            form.about_user.data,
            form.img_url.data)
        db.session.add(user)
        db.session.commit()
        flash('Thank you for your registration')
        flash('Your username is: ' + str(u_unique))
        return redirect(url_for('login'))
    else:
        for error in form.errors:
            flash(error)

    return render_template('register.html',
        title = 'Registeration',
        form = form)

错误是：

 Traceback (most recent call last) File <br> "/home/maksad/Desktop/faskMonkey/flask/lib/python2.7/site-packages/flask/app.py", line 1701, in __call__ return self.wsgi_app(environ, start_response)
File "/home/maksad/Desktop/faskMonkey/flask/lib/python2.7/site-packages/flask/app.py", line 1689, in wsgi_app response = self.make_response(self.handle_exception(e))
File "/home/maksad/Desktop/faskMonkey/flask/lib/python2.7/site-packages/flask/app.py", line 1687, in wsgi_app response = self.full_dispatch_request()
File "/home/maksad/Desktop/faskMonkey/flask/lib/python2.7/site-packages/flask/app.py", line 1360, in full_dispatch_request rv = self.handle_user_exception(e)
File "/home/maksad/Desktop/faskMonkey/flask/lib/python2.7/site-packages/flask/app.py", line 1358, in full_dispatch_request rv = self.dispatch_request()
File "/home/maksad/Desktop/faskMonkey/flask/lib/python2.7/site-packages/flask/app.py", line 1344, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args)
File "/home/maksad/Desktop/faskMonkey/app/views.py", line 92, in register form.email_unique(form.email.data)
File "/home/maksad/Desktop/faskMonkey/app/forms.py", line 26, in email_unique
 self.email.errors.append('This E-mail address is already in use. Please choose another one.')
 AttributeError: 'tuple' object has no attribute 'append'

原文由 Max 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

tuple 对象 无法追加。相反，使用 list() 转换为列表，然后追加，然后转换回来，如下所示：

 >>> obj1 = (6, 1, 2, 6, 3)
>>> obj2 = list(obj1) #Convert to list
>>> obj2.append(8)
>>> print obj2
[6, 1, 2, 6, 3, 8]
>>> obj1 = tuple(obj2) #Convert back to tuple
>>> print obj1
(6, 1, 2, 6, 3, 8)

希望这可以帮助！

原文由 A.J. Uppal 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

我自己刚刚遇到这个。我认为对您的问题更好的回答是您应该在向元素添加错误之前验证这些元素。验证过程将错误字段设置为一个列表，如果您在验证字段之前更改它，它将在您验证时被覆盖。

因此，覆盖表单的验证方法，调用父验证方法，然后在其中运行 email_unique 方法。

然后您可以从视图中删除 email_unique，因为它将成为您的 validate_on_submit 的一部分

原文由 24HourPhysicist 发布，翻译遵循 CC BY-SA 3.0 许可协议