"""PUT /admin/settings/setting_id: Update an existing item"""

        # Forms posted to this method should contain a hidden field:

        #    <input type="hidden" name="_method" value="PUT" />

        # Or using helpers:

        #    h.form(url('admin_setting', setting_id=ID),

        #           method='put')

        # url('admin_setting', setting_id=ID)

        if setting_id == 'mapping':

            rm_obsolete = request.POST.get('destroy', False)

            log.debug('Rescanning directories with destroy=%s', rm_obsolete)

            initial = ScmModel().repo_scan()

            log.debug('invalidating all repositories')

            for repo_name in initial.keys():

                invalidate_cache('get_repo_cached_%s' % repo_name)

            added, removed = repo2db_mapper(initial, rm_obsolete)

            h.flash(_('Repositories successfully'

                      ' rescanned added: %s,removed: %s') % (added, removed)

                      , category='success')

        if setting_id == 'whoosh':

            repo_location = self.get_hg_ui_settings()['paths_root_path']

            full_index = request.POST.get('full_index', False)

            h.flash(_('Whoosh reindex task scheduled'), category='success')

        if setting_id == 'global':

            application_form = ApplicationSettingsForm()()

            try:

                form_result = application_form.to_python(dict(request.POST))

                settings_model = SettingsModel()

                try:

                    hgsettings1 = settings_model.get('title')

                    hgsettings1.app_settings_value = form_result['rhodecode_title']

                    hgsettings2 = settings_model.get('realm')

                    hgsettings2.app_settings_value = form_result['rhodecode_realm']

                    hgsettings3 = settings_model.get('ga_code')

                    hgsettings3.app_settings_value = form_result['rhodecode_ga_code']

                    self.sa.add(hgsettings1)

                    self.sa.add(hgsettings2)

                    self.sa.add(hgsettings3)

                    self.sa.commit()

                    set_rhodecode_config(config)

                    h.flash(_('Updated application settings'),

                            category='success')

                    log.error(traceback.format_exc())

                    h.flash(_('error occurred during updating application settings'),

                            category='error')

                    self.sa.rollback()

            except formencode.Invalid, errors:

                return htmlfill.render(

                     render('admin/settings/settings.html'),

                     defaults=errors.value,

                     errors=errors.error_dict or {},

                     prefix_error=False,

                     encoding="UTF-8")

        if setting_id == 'mercurial':

            application_form = ApplicationUiSettingsForm()()

            try:

                form_result = application_form.to_python(dict(request.POST))

                try:

                    hgsettings1 = self.sa.query(RhodeCodeUi)\

                    .filter(RhodeCodeUi.ui_key == 'push_ssl').one()