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How to pre populate field flask wtforms

@decorator_authorized_user  # This decorator should make sure the user is authorized, like @login_required from flask-login
def editprofile(nickname = None):
    # Prepare the form and user
    form = EditProfile()
    form_action = url_for('profile.editprofile')
    my_user = Users.get(...)  # get your user object or whatever you need
    if request.method == 'GET':
        form.username.data = my_user.username
        form.email.data = my_user.email
        # and on
    if form.validate_on_submit():
        # This section needs to be reworked.
        # You'll want to take the user object and set the appropriate attributes
        # to the appropriate values from the form.
        if form.username.data == nickname: 
            query = EditProfile(form.username.data,
                                form.email.data,
                                form.about.data,
                                form.website.data,
                                )
            print query #debug
            db.session.add(query)
            db.session.commit()
            flash('User Updated')
            print "added"
            return(url_for('profile.editprofile'))
    return render_template('profile/add.html', form=form,
                           form_action=form_action, title="Update Profile")

Source: stackoverflow.com

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