form.validate_on_submit() 缺少 1 个必需的位置参数：'self'

Question

我正在尝试呈现包含表单的模板并验证表单中的信息。我收到以下错误：

app\views.py", line 47, in signup
if form.validate_on_submit():
    TypeError: validate_on_submit() missing 1 required positional argument: 'self'

这是我的代码：

app/views.py:

from .forms import SignUp
from .models import User

@app.route('/signup', methods=["GET", "POST"])
def signup():
    form = SignUp
    if form.validate_on_submit():
        user = User(
            email=form.email.data,
            username=form.username.data,
            first_name=form.first_name.data,
            last_name=form.last_name.data
        )
        db.session.add(user)
        db.session.commit()
        return 'success'
    return render_template('signup.html', form=form)

app/forms.py

from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.fields.html5 import EmailField
from wtforms.validators import DataRequired, Email

class SignUp(FlaskForm):
    email = EmailField('Email', validators=[DataRequired(), Email()])
    username = StringField('Username', validators=[DataRequired()])
    first_name = StringField('First Name', validators=[DataRequired()])
    last_name = StringField('Last Name', validators=[DataRequired()])
    submit = SubmitField('Sign Up')

app/models.py:

from app import db

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(60), index=True, unique=True)
    username = db.Column(db.String(60), index=True, unique=True)
    first_name = db.Column(db.String(60), index=True)
    last_name = db.Column(db.String(60), index=True)

错误来自 views.py 文件，位于：validate_on_submit()。我也包含了我的模型和表单代码。我已按照此中的建议进行操作，但仍然出现相同的错误。

Answer 1

更改此行

    form = SignUp

进入这个：

    form = SignUp()

Answer 2

您需要像这样实例化 SignUp 表单：

# app/views.py

from .forms import SignUp
from .models import User

@app.route('/signup', methods=["GET", "POST"])
def signup():
    form = SignUp() # HERE
    if form.validate_on_submit():
    ...

form.validate_on_submit() 缺少 1 个必需的位置参数：'self'

form.validate_on_submit() missing 1 required positional argument: 'self'

flask

python-3.x

flask-wtforms