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

Question

I'm new to flask web development, I'm trying to render a template containing a form, and validate information from the form. I'm getting the following error

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

here's my code:

# 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)

forms

#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')

models:

#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)

error is from the views file at: validate_on_submit(), i have included my models and forms code as well. I have done as recommended in this post TypeError validate on submit missing required positional argument but i still get the same error

Answer 1

更改此行

public ThirdPartyResponse load(ThirdPartyRequestContext context) {

    ThirdPartyResponse thirdPartyResponse = new ThirdPartyResponse();
    try
    {
        thirdPartyResponse.setData(getData(context));
    }catch (Exception e)
    {
        LOGGER.error("Error executing {}", context.getEndpoint(), e);
        thirdPartyResponse.setData(Collections.emptyList());
        thirdPartyResponse.setErrorMessage(e.getMessage());
    }
    return thirdPartyResponse;
}

对此：

    form = SignUp

Answer 2

您需要实例化 form = SignUp() 表单

SignUp