Quiz about Certification Exam, Magento, Magento 2 Certified Associate Developer Exam

Question 1

The module MyCompany_MyModule provides custom admin interface pages.
Access to these pages should only be granted to specific users.
You add the required configuration to the module's acl.xml file, but the setting does not seem to
work as expected.
How do you visually check if Magento evaluates your ACL resource as expected?

Accepted Answer

Inspect the response of a GET request to the webapi endpoint

Answer

Write a plugin for the class \Magento\Framework\Acl\LoaderInterface::populateAcl() and echo
out the loaded roles

Answer

Inspect the output of the CLI command bin/magento admin:role:resources - all

Answer

In the browser, open the admin User Roles page. Choose a role and inspect the tree of available
resources

Question 2

How do you add a foreign key to an existing table created by another module?

Accepted Answer

Run the command bin/magento setup:db-schema:upgrade

Answer

Create etc/db_schema.xml file with the table node and constraint child node

Answer

This can only be done with raw SQL in a Schema Patch file

Answer

Create the etc/db_constraints.xml file and specify foreign key there in the constraint node

Question 3

What order operation is available in the My Account section in the storefront?

Accepted Answer

Reorder

Answer

Edit order

Answer

Refund

Answer

Invoice

Question 4

You are working on a new entity called vendor. You implemented the model, resource model and
collection. You want to ensure that standard model events will be fired for your model, so an
observer can be created for the events vendor_save_after, vendor_save_commit_after and others.
How do you do that?

Accepted Answer

Declare the $_eventPrefix property in your vendor model and set it to vendor

Answer

Create an entry in etc/di.xml and add the argument eventPrefix with the value of vendor

Answer

You must implement all appropriate methods and fire the events manually

Answer

Ensure that the primary key in the corresponding table is named vendor_id

Question 5

You are writing a customization for the customer module. You need to make sure the
configuration files from your module are loaded after the customer module's configuration.
Where should the dependency be declared?

Accepted Answer

composer.json

Answer

etc/module.xml

Answer

etc/config.xml

Answer

etc/di.xml

Question 6

You got a notification about error that occurred on a production environment. The merchant gave
you the error identifier.
How do you find the error message based on the identifier?

Accepted Answer

The error is sent to the pre-configured error email with the identifier in the subject

Answer

An error is written to the var/log/exception.log file including the identifier

Answer

A file with a name matching the identifier is written to the var/report folder

Answer

An error message is written to the database table error_log with an error_id field matching the
identifier

Question 7

How can you access the select query of a collection?

Accepted Answer

You can get it by using public method getSelect() which returns an instance of
Magento\Framework\DB\Select

Answer

You can only access the select query after the collection has been loaded by calling the public
method query()

Answer

It is stored in a protected variable $query and can only be accessed from the inside of a collection
class

Answer

The select query is not available in the collection class, it will be generated by the MySQL adapter
right before executing a query

Question 8

You are implementing a custom module MyModule, which provides an implementation of
\Psr\Log\LoggerInterface called \MyCompany\MyModule\Logger.
The LoggerInterface has the default preference declared in app/etc/di.xml.
Keeping upgradability in mind, how do you make \MyCompany\MyModule\Logger the default
implementation of the LoggerInterface globally?

Accepted Answer

Declare a new preference for the LoggerInterface in MyCompany/MyModule/etc/di.xml

Answer

Declare a new preference for the LoggerInterface in
app/code/myCompany/MyModule/etc/frontend/di.xml

Answer

Overwrite the existing preference for the LoggerInterface in app/etc/di.xml

Answer

Declare a new preference for the LoggerInterface in
app/code/MyCompany/MyModule/etc/global/di.xml

Question 9

In a code review of a merchant's site you have discovered that there are multiple observers for
the checkout_submit_all_after event. After closer inspection, you notice one of these observers is
relying on the others being executed before it is called.
What risk does this pose, and how can it be mitigated?

Accepted Answer

Event observers are fired in alphabetical order of the observer name. There is no risk here.

Answer

There is no risk posed as long as each event observer specifies a correct sortOrder. Nothing needs
to be changed.

Answer

Magento only supports one observer per event. These observers will need to be combined into a
single point of customization.

Answer

Order of listener execution cannot be guaranteed, resulting in a fragile implementation. This code
should be re-worked using plugins

Question 10

You are developing a module and need to add another column to a table introduced by another
module MyCompany_MyModule via db schema.
How do you do that?

Accepted Answer

Create a etc/db_schema.xml file in your module, add the column and run bin/magento
setup:upgrade

Answer

Create a etc/db.xml file in your module, add the column and run bin/magento setup:db-
schema:upgrade

Answer

Run a command: bin/magento setup:db-schema:upgrade

Answer

Create a etc/db_schema_whitelist.json file in your module, add the column and run bin/magento
setup:upgrade

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