标签: wtforms

我有一个 SQLAlchemy 模型，其中有一个从 HTML 表单填充的整数列（我正在使用 Flask 和 WTForms-alchemy，并且我试图避免在路由中编写自定义代码）。如果用户没有在表单上输入该整数的值，则从表单填充对象的代码最终会尝试为该列放入一个空字符串，并且 MySQL 会抱怨这不是一个整数值。为了帮助人们搜索：我开始遇到的错误Incorrect integer value: '' for column ...。

我不想使用sql_mode=''hack，人们建议这样做是为了让 MySQL 回到旧的行为，每当你给它不正确的数据时就进行猜测，因为我无法控制最终将使用的 MySQL 服务器。

我想要的是类似于默认列规范的东西，除了在没有任何内容传入时指定默认值，我想拦截尝试放入空字符串并将其替换为 None ，我认为这会被转换为当它进入数据库时​​为 null。

有没有办法在模型定义中做到这一点？我意识到这可能会导致性能下降，但吞吐量在此应用程序中并不是什么大问题。

WTForms已更新为2.3.0具有重大更改。我尝试过调整其他要求，例如werkzeug.1.0.0但还没有成功。有人找到解决办法了吗？

这是堆栈跟踪：

Traceback (most recent call last):
   File "/usr/local/bin/celery", line 8, in <module>
     sys.exit(main())
   File "/usr/local/lib/python3.8/site-packages/celery/__main__.py", line 16, in main
     _main()
   File "/usr/local/lib/python3.8/site-packages/celery/bin/celery.py", line 322, in main
     cmd.execute_from_commandline(argv)
   File "/usr/local/lib/python3.8/site-packages/celery/bin/celery.py", line 495, in execute_from_commandline
     super(CeleryCommand, self).execute_from_commandline(argv)))
   File "/usr/local/lib/python3.8/site-packages/celery/bin/base.py", line 289, in execute_from_commandline
     argv = self.setup_app_from_commandline(argv)
   File "/usr/local/lib/python3.8/site-packages/celery/bin/base.py", line 509, in setup_app_from_commandline
     self.app = self.find_app(app)
   File "/usr/local/lib/python3.8/site-packages/celery/bin/base.py", line 531, in find_app
     return find_app(app, symbol_by_name=self.symbol_by_name)
   File "/usr/local/lib/python3.8/site-packages/celery/app/utils.py", line 373, in find_app
     sym = symbol_by_name(app, imp=imp)
   File "/usr/local/lib/python3.8/site-packages/celery/bin/base.py", …

我想添加一个返回上一页的取消按钮。我的代码是：forms.py：

from flask_wtf import Form
from wtforms import StringField, HiddenField, SubmitField
from wtforms.validators import DataRequired, Length, ValidationError


def _required(form, field):
    if not field.raw_data or not field.raw_data[0]:
        raise ValidationError('Field is required')

class OrganisationForm(Form):
    id = HiddenField('id', default="-1")
    name = StringField('name', validators=[DataRequired()])
    manager_name = StringField('manager_name')
    address = StringField('address', validators=[DataRequired()])
    city = StringField('city', validators=[DataRequired()])
    postal_code = StringField('postal_code', validators=[DataRequired(), Length(max=16)])
    province = StringField('province', validators=[Length(max=2, message="Can't exceed 2 characters")])
    country = StringField('country', validators=[DataRequired()])
    submit = SubmitField('Add')
    cancel = SubmitField('Cancel')

和模板页面：

{% block content %}
<div …

我的输入格式很奇怪,但根据规范:

用户应在4个字段(!)中输入ID,其中id为460 000 005 001,其中46是国家代码,右边部分是用户的appengine ID.现在我想在此字段中添加验证,但我无法使用wtforms进行验证.这是我的表单类:

class RegisterWTForm(Form):
    soc_sec = TextField(_('Soc security number'),  [validators.Regexp('^[0-9]+$',
                      message=_('This is not a social security number, please see the example and try again'
                      )), validators.Required(message=_('Social security number is required')), unique_soc_sec], widget=MyTextInput())
    email = TextField(_('Email'),
                      [validators.Required(message=_('Email is required'
                      )),
                      validators.Email(message=_('Your email is invalid'
                      ))], widget=MyTextInput())

    def validate_soc_sec(form, field):
        if len(field.data) != 10:
            raise ValidationError(_('Soc sec must be 10 characters'
                                  ))
    def validate_email(form, field):
        if len(field.data) > 60:
            raise ValidationError(_('Email must be less than 60 characters'
                                  )) …

我正在使用Flask-WTF表单,我有以下代码:

在forms.py中

class DealForm( Form ):
    country  = SelectField( 'Country' )

在main.py中

if not form.validate_on_submit():
    form = DealForm()
    form.country.choices = [('us','USA'),('gb','Great Britain'),('ru','Russia')]
    return render_template( 'index.html', user = current_user, form = form )
else:
    return render_template( 'index.html', form = form )

我从POST返回时出错,因为country.choices是None我做错了什么？

我正在为代表账单的对象制作一个crud接口,如水费单,电费单等.

我正在使用sqlalchemy处理数据,使用wtforms来处理表单,并使用flask来处理它.

以下是我的路线看起来像是用来编辑现有账单的表格:

@app.route('/edit_bill/<int:bill_id>', methods = ['GET'])
def edit_bill(bill_id):
    s = Session()
    bill = s.query(Bill).filter_by(id=bill_id).first()
    form = BillForm(obj=Bill)
    return render_template('edit_bill.html', form = form)

使用wtforms,我将bill对象传递给BillForm构造函数,确保表示要编辑的帐单的数据填充到表单中.

这就是它窒息的地方.这是例外:

AttributeError: Neither 'InstrumentedAttribute' object nor 'Comparator' object associated with Bill.date_due has an attribute 'strftime'

现在,我已经深入了解python shell并查询了一个帐单,以确保date_due上有一个datetime.date对象,就是这样.我使用Jinja来构建我的前端,所以我考虑创建一个模板过滤器,但我不知道如何使用wtforms,看起来sqlalchemy无论如何都是窒息.

那么它做什么？我非常有信心我只需要弄清楚如何将该datetime.date对象转换为字符串,但我不知道该怎么做.

HALP.谢谢!

编辑:这是BillForm类:

class BillForm(Form):
    id                  = HiddenField()
    name                = TextField(u'Name:', [validators.required()])
    pay_to              = TextField(u'Pay To:',[validators.required()])
    date_due            = DateField(u'Date Due:',[validators.required()])
    amount_due          = IntegerField(u'Amount Due:', [validators.required()])
    date_late           = DateField(u'Late After:',[validators.required()])
    amount_late         = IntegerField(u'Late Amount:', [validators.required()])
    date_termination …

这可能非常简单.但我正在使用WTForms,并希望将字段的值设置为我从数据库中提取的变量.但它不是显示动态变量,而是显示变量名称.

{{ form.question.label }}
{{ form.question(value="{{ q.question }}") }}

{{ form.slug.label }}
{{ form.slug(value="{{ q.slug }}") }}

所以在现场它说"{{q.question}}"而不是"生命的意义是什么？"之类的东西.

有没有办法在Jinja中显示嵌套变量？或者我还有其他方法可以解决这个问题吗？任何帮助表示赞赏!

我有一个带有多个链接的页面,可以将用户重定向到不同的页面.我认为使用表单会更好,所以我定义了一个Form具有多个的WTForms SubmitFields.如何确定单击了哪个按钮并根据该按钮进行重定向？

class MainForm(Form):
    user_stats = SubmitField('User Stats')
    room_stats = SubmitField('Room Stats')

@main.route('/')
@login_required
def index():
    form = MainForm()    
    return render_template('index.html', form=form)

<form action="#" method="post">
    {{ wtf.quick_form(form) }}
</form>

我正在使用Flask-WTForms创建一个表单.

我正在使用BooleanField,以便用户可以表明他们同意条款.

我无法在提交时验证BooleanField以确保它已被检查.我尝试使用Required(),DataRequired()和自定义验证,但在每种情况下我都没有收到验证错误.

以下是该应用程序的细节:

from flask import Flask, render_template, session, redirect, url_for, flash
from flask_wtf import Form
from wtforms import BooleanField, SubmitField
from wtforms.validators import Required, DataRequired
from flask_bootstrap import Bootstrap

app = Flask(__name__)
app.config['SECRET_KEY'] = 'impossibletoknow'

bootstrap = Bootstrap(app)

class AgreeForm(Form):
    agreement = BooleanField('I agree.', validators=[DataRequired()])
    submit = SubmitField('Submit')


@app.route('/', methods=['GET', 'POST'])
def index():
    form = AgreeForm()
    if form.validate_on_submit():
        agreement = form.agreement.data
        if agreement is True:
            flash('You agreed!')
        return redirect(url_for('index', form=form))
    form.agreement.data = None
    agreement = False
    return render_template('index.html', …

我在表单验证方面遇到了麻烦.国家/地区列表生成正确,以前的表单工作正常.它只会在POST请求中中断.

这是我的forms.py:

from wtforms import Form, BooleanField, SelectField, \
                    StringField, PasswordField, SubmitField, validators, \
                    RadioField
from ..models import User
from pycountry import countries
...
## Account settings
# We get all COUNTRIES
COUNTRIES = [(c.name, c.name) for c in countries]
# edit profile
class ProfileForm(Form):
    username = StringField('name',[validators.Length(min=1, max=120), validators.InputRequired])
    email = StringField('email', [validators.Length(min=6, max=120), validators.Email()])
    company = StringField('name',[validators.Length(min=1, max=120)])
    country = SelectField('country', choices=COUNTRIES)
    news = BooleanField('news')

这是观点:

@user.route('/profile/', methods=['GET', 'POST'])
@login_required
def profile():
    userid = current_user.get_id()
    user = User.query.filter_by(id=userid).first_or_404() …