wtf.py

def create():
    class Form(IForm):
        name = wtf.TextField(_('Library Name'), [wtf.Required(), wtf.Length(max=80)])

    form = Form()

    if form.validate_on_submit():
        library = m.Library(
            name = form.name.data,
        )
        library.save()

        flask.flash(_("Library created"),category="success")
        return redirect(url_for('.index'))

    return dict(form=form)