October: Override ImportExportController Behavior give an exception

[chrisvidal]

• OctoberCMS Build: latest
• PHP Version: 7.3
• Database Engine: MySQL 5.5

Description:

When creating a new Controller Behavior class by overriding the ImportExportController behavior, and navigating to the export URL,, this exception shows up:

The partial '_container_export.htm' is not found.

[2020-07-08 05:24:09] development.ERROR: October\Rain\Exception\SystemException: The partial '_container_export.htm' is not found. in /Users/christophevidal/Sites/oc-sttelemedia/modules/system/Traits/ViewMaker.php:91
Stack trace:
#0 /Users/christophevidal/Sites/oc-sttelemedia/modules/backend/Behaviors/ImportExportController.php(688): Backend\Classes\ControllerBehavior->makePartial('_container_expo...', Array)
#1 /Users/christophevidal/Sites/oc-sttelemedia/modules/backend/Behaviors/ImportExportController.php(492): Backend\Behaviors\ImportExportController->importExportMakePartial('container_expor...')
#2 [internal function]: Backend\Behaviors\ImportExportController->exportRender()
#3 /Users/christophevidal/Sites/oc-sttelemedia/vendor/october/rain/src/Extension/ExtendableTrait.php(411): call_user_func_array(Array, Array)

Steps To Reproduce:

[chrisvidal]

my new controller looks like

Class ExportSelected extends ImportExportController
{

    /**
     * Behavior constructor
     * @param Backend\Classes\Controller $controller
     */
    public function __construct($controller)
    {
        parent::__construct($controller);
    }

    public function index_onExportSelected()
    {
    }
}

[LukeTowers]

@chrisvidal why are you extending the behavior instead of just overriding the methods?

[chrisvidal]

not sure to understand the question.
I want to make this behavior class available in my other projects.

[Rike-cz]

When I had the same challenge, I used this constructor for change partials path:

public function __construct($controller)
{
    parent::__construct($controller);

    $this->viewPath = $this->guessViewPathFrom(\Backend\Behaviors\ImportExportController::class, '/partials');
    $this->assetPath = $this->guessViewPathFrom(\Backend\Behaviors\ImportExportController::class, '/assets', true);
}

[LukeTowers]

@chrisvidal I still don't understand your use case, but @Rike-cz has the correct fix for your current issue.

[chrisvidal]

@LukeTowers
I am creating a new behavior inheriting from the existing ImportExporController because I want to add a missing functionality which is the ability to export selected rows from a backend list, instead of using the export form.

@Rike-cz thanks a lot. Let me try this.