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This tutorial can be applied to ThirtyBees as well!

Part of the functionality we need is in PrestaShop already, all we have to do is add some place where we can submit the change of department type.
Open up AdminCustomerThreadsController.php located in controllers/admin or use an override instead (recommended). We are interested in the renderView method, specifically where it assigns $this->tpl_vars, around line 700 in PrestaShop 1.6.1.7.

        $this->tpl_view_vars = array(
            'id_customer_thread' => $id_customer_thread,
            'thread' => $thread,
            'actions' => $actions,
            'employees' => $employees,
            'current_employee' => $this->context->employee,
            'messages' => $messages,
            'first_message' => $first_message,
            'contact' => $contact,
            'contacts' => $contacts, // <-- This is what we added!
            'next_thread' => $next_thread,
            'orders' => isset($orders) ? $orders : false,
            'customer' => isset($customer) ? $customer : false,
            'products' => isset($products) ? $products : false,
            'total_ok' => isset($total_ok) ?  Tools::displayPrice($total_ok, $this->context->currency) : false,
            'orders_ok' => isset($orders_ok) ? $orders_ok : false,
            'count_ok' => isset($orders_ok) ? count($orders_ok) : false,
            'PS_CUSTOMER_SERVICE_SIGNATURE' => str_replace('\r\n', "\n", Configuration::get('PS_CUSTOMER_SERVICE_SIGNATURE', (int)$thread->id_lang)),
            'timeline_items' => $timeline_items,
        );

Please note: if you use an override, copy the whole method, add the variable as described above, and make sure you change return parent::renderView() to return AdminController::renderView() at the very end! Failing to do so will make it impossible for our new variable to be used in the template, as the parent class would simply override the tpl_vars.

Now that we have the variable containing all contacts, let’s add a form to submit it, in the view.tpl template of that controller. The file we want is located in the theme folder themes\default\template\controllers\customer_threads\helpers\view. Once more, it’s named view.tpl.
You can find any spot you like for the new button, I added it at the very beginning, before the div with class “well”

	<div class="well">
		<form action="{$link->getAdminLink('AdminCustomerThreads')|escape:'html':'UTF-8'}&amp;viewcustomer_thread&amp;id_customer_thread={$id_customer_thread|intval}" method="post" class="form-horizontal">
			<div class="row">
				<div class="col-sm-3">
					<select name="id_contact">
						{foreach from=$contacts item=dept}
							<option value="{$dept.id_contact}" {if $dept.name == $contact}selected="selected"{/if}>
								{$dept.name}
							</option>
						{/foreach}
					</select>
				</div>
				<div class="col-sm-3">
					<button class="btn btn-default" type="submit">
						{l s='Change Department'}
					</button>
				</div>
			</div>
		</form>
	</div>

Save and refresh, we should be done! We didn’t have to add any post processing code, simply because it’s already present, at the very beginning of the postProcess method of the AdminCustomerThreadsController.

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