TCS Drupal Developer Interview Questions and Answers

An abstract class is a class that cannot be instantiated and is used as a base for other classes to inherit from.

• Cannot be instantiated on its own

• May contain abstract methods that must be implemented by child classes

• Can have both abstract and non-abstract methods

Types of Drupal entities include nodes, users, taxonomy terms, and custom entities.

• Nodes: Basic content type in Drupal, can represent articles, pages, etc.

• Users: Represents individuals who can log in and interact with the site.

• Taxonomy terms: Used for categorizing content.

• Custom entities: Entities created by developers for specific needs.

Custom form methods in Drupal allow developers to create and manipulate forms in unique ways.

• Custom form methods can be used to alter form elements, validate form submissions, and process form data.

• Examples include using hook_form_alter to modify existing forms, implementing custom form validation functions, and creating custom submit handlers.

• Custom form methods can also be used to create entirely new forms from scrat...read more

MySQL types of Joins, Delete vs TRUNCATE

• Types of Joins in MySQL: INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN

• DELETE statement removes specific rows from a table based on a condition

• TRUNCATE statement removes all rows from a table without logging individual row deletions

Git commands include add, commit, push, pull, merge, branch, checkout, and clone.

• git add - stages changes for commit

• git commit - records changes to the repository

• git push - uploads local changes to a remote repository

• git pull - downloads changes from a remote repository

• git merge - combines changes from different branches

• git branch - lists, creates, or deletes branches

• git checkout - switches branches or restores files

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T function is used in Drupal to translate text strings into the current language of the website.

• T function is used to translate text strings in Drupal.

• It is used to ensure that text displayed on the website is in the correct language.

• Developers can use the T function in their code to make it multilingual.

• Example: t('Hello world') will translate 'Hello world' into the current language of the website.

Event subscriber example in Drupal development

• Event subscribers allow modules to subscribe to and respond to events triggered by the Drupal core or other modules

• Event subscribers are defined in a module's services.yml file

• Example: Creating an event subscriber to log user login events

To debug errors in production environment, follow these steps

• Check error logs for specific error messages

• Use debugging tools like Xdebug or Drupal's built-in debugging features

• Review recent code changes that may have caused the error

• Test the code on a local environment to replicate the issue

• Consult with team members or online forums for assistance