nopaque/app/admin/forms.py

from app.models import Role, User
from flask_wtf import FlaskForm
from wtforms import (BooleanField, SelectField, StringField, SubmitField,
                     ValidationError)
from wtforms.validators import DataRequired, Email, Length, Regexp


class EditUserForm(FlaskForm):
    email = StringField('Email',
                        validators=[DataRequired(), Length(1, 64), Email()])
    username = StringField('Username',
                           validators=[DataRequired(), Length(1, 64),
                                       Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0,
                                              'Usernames must have only '
                                              'letters, numbers, dots or '
                                              'underscores')])
    confirmed = BooleanField('Confirmed')
    role = SelectField('Role', coerce=int)
    name = StringField('Real name', validators=[Length(0, 64)])
    submit = SubmitField('Update Profile')

    def __init__(self, user, *args, **kwargs):
        super(EditUserForm, self).__init__(*args, **kwargs)
        self.role.choices = [(role.id, role.name)
                             for role in Role.query.order_by(Role.name).all()]
        self.user = user

    def validate_email(self, field):
        if field.data != self.user.email and \
                User.query.filter_by(email=field.data).first():
            raise ValidationError('Email already registered.')

    def validate_username(self, field):
        if field.data != self.user.username and \
                User.query.filter_by(username=field.data).first():
            raise ValidationError('Username already in use.')