Free Adobe AD0-E716 Practice Exam with Questions & Answers

The developer can resolve this issue by creating a plugin for the Magento\Catalog\Model\Indexer\Product\Price::executeRow() method. This method is responsible for updating the product price index.

The plugin can be used to add the pricing adjustment from the database to the product price index. Once the product price index is updated, the layered navigation will display the correct price.

Here is an example of a plugin for the executeRow() method:

PHP

class MyPlugin

{

public function executeRow(

\Magento\Catalog\Model\Indexer\Product\Price $subject,

\Magento\Catalog\Model\Product $product,

array $data

) {

$adjustment = $this->getAdjustment($product);

$product->setPrice($product->getPrice() + $adjustment);

}

private function getAdjustment(Product $product)

{

$adjustment = $product->getData('adjustment');

if (!is_numeric($adjustment)) {

return 0;

}

return $adjustment;

}

}

This plugin will add the adjustment data from the product to the product price index. Once the product price index is updated, the layered navigation will display the correct price.

The variable env: composer_auth is located in the Project variables section in the Project Web Interface. This variable is used to store the authentication credentials for Composer repositories that require access keys or tokens. The developer can set this variable at the project level to apply it to all environments, or override it at the environment level if needed. Verified References: [Magento 2.4 DevDocs] 2

To display a "file upload" field in the Adobe Commerce (Magento) admin configuration and process the uploaded CSV file, two key requirements must be met:

Backend Model to Handle File Upload Processing (Option B):The backend model (\My\Module\Model\Config\Backend\ImportFees) is required to extend \Magento\Framework\App\Config\Value and override the afterSave method. This method will contain the logic needed to process the uploaded CSV file after it has been saved. The backend model is the key component that allows you to handle custom processing, like reading the CSV file and executing the required operations.

Explanation: The backend model is used in Magento to add logic for saving configuration values in a custom way. Here, it’s essential because you need to process the CSV file and potentially save additional data in the database or perform other operations.

References: Magento DevDocs and core modules show that the backend model is utilized whenever a custom save action is required for admin configuration values.

File Type Configuration in system.xml (Option C):Defining the field in etc/adminhtml/system.xml with the type="file" attribute ensures that Magento renders this field as a file upload input in the admin configuration. The tag should have the appropriate id, label, type="file", and other attributes necessary to define it in the backend configuration. The field’s type attribute set to file enables the file upload feature within the configuration.

Explanation: The file type within system.xml instructs Magento to render a file input field. This is crucial for allowing users to upload a file in the admin configuration, which then can be processed by the backend model.

References: The Magento official documentation outlines how system.xml configuration files can be used to add custom fields to the system configuration in the Magento backend.

Options A and D are incorrect because they do not specifically address the requirements of setting up a file upload field and processing a CSV import. Option A configures a backend model but lacks the necessary file type definition. Option D defines a custom type for the file field but does not directly address the file upload or CSV processing requirements.

In Magento 2, to add a new action to a pre-existing route without interfering with the existing functionality, the new action should be placed in the same directory structure under the new module’s controller namespace. Magento's autoloading mechanism will automatically detect and include it alongside the original module's actions.

Here's how you can achieve this:

Directory Structure: Ensure that your new module's controller directory structure mirrors that of the original module.

Controller Action: Define the new action within the appropriate directory.

For example, if you want to add a new action to the catalog route in Magento_Catalog:

Create a directory structure app/code/My/Module/Controller/Catalog/.

Add your new action class in this directory, for example:

namespace My\Module\Controller\Catalog;

use Magento\Framework\App\Action\Action;

use Magento\Framework\App\Action\Context;

class NewAction extends Action

{

public function __construct(Context $context)

{

parent::__construct($context);

}

public function execute()

{

// Your custom logic here

}

}

Router Configuration: Magento automatically includes this action when the route matches.

By following this method, you ensure that your new action is added seamlessly without modifying the original module or causing conflicts. Magento's router will include and recognize your action based on the directory and namespace conventions.

Sources:

Fundamentals of Magento 2 Development documents​​ .

Magento 2 official developer documentation.

To prevent the media_gallery attribute from being exported as part of the custom entity's data, the developer should add this attribute to the $_disabledAttrs class property array. This effectively excludes the attribute from the export process, ensuring that it does not appear in the exported file and thus will not be modified or re-imported inadvertently.

Option C is correct for the following reasons:

Preventing Export with $_disabledAttrs:Adding media_gallery to the $_disabledAttrs array tells the system to skip this attribute during export. This prevents the attribute from being included in the export file, thus removing the risk of it being altered by external software that handles the file. Since the attribute will not be present in the exported data, it will remain unchanged in the database when re-importing.

Explanation: The $_disabledAttrs property is specifically designed to exclude certain attributes from the export process. By using this property, you ensure that attributes not intended for editing or visibility in exports are safely omitted, maintaining data integrity.

References: The Adobe Commerce documentation on import/export processes outlines how $_disabledAttrs can be used to filter out sensitive or unnecessary attributes from export files.

Alternative Options and Their Limitations:

Option A: Using $_transformAttrs with a serializer is useful for encoding or decoding attribute data during export/import, but it does not prevent the attribute from being included in the export. This would only help if the media_gallery data needed transformation, not exclusion.

Option B: $_strippedAttrs is applicable for filtering attributes from the imported file, not the exported file. It would not stop the attribute from being included in the export and hence does not align with the need to prevent modifications during export.

By configuring $_disabledAttrs, the developer effectively ensures the media_gallery attribute remains unmodified by preventing it from being included in export files altogether.

If the Sodium extension is installed, Argon 2ID13 will be chosen as the Magento default hashing algorithm. Otherwise, SHA256 will be used.

The Sodium extension is a PHP extension that provides cryptographic functions. Argon 2ID13 is a password hashing algorithm that is considered to be more secure than SHA256.

If the Sodium extension is installed, Magento will use Argon 2ID13 as the default hashing algorithm for customer passwords. If the Sodium extension is not installed, Magento will use SHA256 as the default hashing algorithm.

Adobe Commerce uses secure hashing algorithms for customer passwords. As of the more recent updates, Adobe Commerce defaults to using the Argon2ID13 hashing algorithm, provided that the Sodium PHP extension is available. Argon2ID is considered a secure and modern hashing algorithm designed to protect against brute-force attacks.

If the Sodium extension is not available, Adobe Commerce falls back to using SHA256, which, while secure, is not as robust as Argon2ID13.

This functionality ensures that customer data is safeguarded with the highest level of security available based on the server configuration.

Additional Resources:

Adobe Commerce Developer Guide: Hashing Algorithms

PHP Documentation: Argon2 and Sodium

The developer can add a custom filter to the virtual type Magento\Catalog\Model\Api\SearchCriteria\CollectionProcessor\ProductFilterProce5sor for supplier_id field. In the custom filter, the developer can apply the needed join and filter to the passed $collection. This is the recommended way to extend the search criteria for products using dependency injection and plugins. Verified References: [Magento 2.4 DevDocs] [Magento Stack Exchange]

In Adobe Commerce, when you need to add a custom filter for a non-EAV attribute stored in a standalone table, the most maintainable approach is to create a custom filter for ProductFilterProcessor. This processor allows for customized search criteria handling, which can be extended to include custom joins and filters without altering core functionality or relying on plugins and observers.

Why Custom Filter in ProductFilterProcessor is Preferred:

The ProductFilterProcessor within SearchCriteria\CollectionProcessor is specifically designed to handle filtering of product collections. By extending this with a custom filter, the developer can implement joins and filters on standalone tables.

This approach is modular and reusable, allowing any code that utilizes ProductRepositoryInterface to apply the supplier_id filter seamlessly.

Implementation of Custom Filter:

Define a custom filter class that implements the required logic to join the standalone table and apply the supplier_id filter.

Register this custom filter with a virtual type in di.xml for ProductFilterProcessor, so it can process the supplier_id as part of the search criteria.

Why Options A and C are Less Suitable:

Option A relies on an event observer, which is less modular and may have performance implications since it requires listening to every product collection load event.

Option C, while functional, involves modifying CollectionProcessorInterface::process(), which is more generic and not specifically tailored for product collection filtering.

References:

Magento Developer Documentation on Using Custom Filters in CollectionProcessor

Magento DevDocs on Dependency Injection and Virtual Types

The reason why there are records remaining in the inventory_reservation table is that only reservations no longer needed are removed by the cron job. The inventory_reservation table tracks the quantity of each product in each order and creates a reservation for each product when an order is placed, shipped, cancelled or refunded. The initial reservation has a negative quantity value and the subsequent reservations have positive values. When the order is complete, the sum of all reservations for the product is zero. The cron job removes only those reservations that have a zero sum from the table, leaving behind any reservations that are still needed for incomplete orders. Verified References: [Magento 2.4 DevDocs] [Magento Stack Exchange]

In Adobe Commerce, when a consumer process needs to restart, the PoisonPillPutInterface can be used. The put() method of this interface triggers a "poison pill," which signals running consumers to restart. This is particularly useful when updated data needs to be reloaded into memory, as in this scenario with the \Magento\Variable\Model\Variable.

Poison Pill Mechanism:

The poison pill method tells the message queue consumer to stop its current process and restart, allowing it to pick up any configuration or data changes that occurred since the last start.

Why Option A is Correct:

By calling PoisonPillPutInterface::put(), the consumer will receive a restart signal, which is ideal for cases where data loaded at the beginning of the consumer’s lifecycle must be updated.

Option B is incorrect because TriggerRestartInterface::trigger() does not exist in the Magento framework. Option C is also incorrect as setting a cache key alone does not trigger a consumer restart.

Implementation:

Use an after plugin on the save() method to trigger PoisonPillPutInterface::put() after the variable is saved.

References:

Magento DevDocs on Message Queues and Poison Pill