Using WTForms' populate_obj( ) method with Flask micro framework

Question

I have a template which allows the user to edit their user information.

<form method="post">
    <table>
        <tr>
            <td>Username:</td>
            <td>{{user['username']}}</td>
        </tr>
        <tr>
            <td>New Password:</td>
            <td> <input type="password" name="password"></td>
            <td>{% if form.password.errors %} {{form.password.errors}} {% endif %}<td>
        </tr>
        <tr>
            <td>Re-enter Password:</td>
            <td> <input type="password" name="confirm_password">
            </td>
        </tr>
        <input type='hidden' name='username' value="{{user['username']}}">
        <tr>
            <td><input type="submit" value="Submit"></td>
        </tr>
    </table>
</form>

I also have a view function for handling such edits by the user. The database I am currently using is MongoDB with the MongoKit module. I have only been able to do up to this so far in the view function, yet with no luck.

def edit():
    username = request.args.get('user')
    user = User.find_one({'username':username}) # Is this a correct way of doing it?
    form = UserForm(**what should be placed here?**, obj=user)

    if request.method == 'POST' and form.validate():
        form.populate_obj(user)
        user.save()
        return 'updated'
    return render_template('edituser.html', form=form, user=user)

I am going through populate_obj(obj) for this purpose. I couldn't find much help in this matter. What should I do in order to get populate_obj() working?

Answer 1

UserForm should have request.form passed into it to populate it with the values available in the POST request (if any).

form = UserForm(request.form, obj=user)