The Rails Guides: Other Components Flashcards
What is Action Mailer?
Action Mailer is a component in Ruby on Rails that facilitates sending emails from your application using mailer classes and views.
How are mailers similar to controllers?
Mailers are similar to controllers in several ways:
They have actions and associated views.
Instance variables set in mailers are accessible in views.
They can utilize layouts and partials.
Access to a params hash is available.
How do you create a mailer in Rails?
o create a mailer in Rails, you can use the bin/rails generate mailer command followed by the mailer name.
What method can be used to specify default values for emails sent from a mailer?
The default method is used to specify default values for emails sent from a mailer. For example:
How do you add attachments to an email in Action Mailer?
You can add attachments to an email in Action Mailer by using the attachments method. For example:
What is Active Job, and what is its primary purpose?
Active Job is a framework in Ruby on Rails for declaring and executing background jobs across a variety of queuing backends. Its primary purpose is to provide a unified job infrastructure for Rails applications, allowing developers to perform tasks asynchronously without worrying about the specific queuing implementation.
How can you create a job using Active Job, and what options are available for generating jobs?
Jobs in Active Job can be created using generators provided by Rails, which generate both the job class and its corresponding test case. Additionally, jobs can be manually created by defining a class that inherits from ApplicationJob.
How do you enqueue a job in Active Job, and what are some examples of setting the timing for job execution?
Enqueuing a job in Active Job is done using the perform_later method, with optional parameters for setting the timing of job execution. Examples include immediate execution, delayed execution, and scheduled execution at a specific time.
What is the significance of setting up a queuing backend for job execution in production, and what are some of the built-in adapters for queuing backends in Active Job?
Setting up a queuing backend for Active Job in production is essential for persistent job storage and execution. Built-in adapters for queuing backends include Sidekiq, Resque, Delayed Job, and others.
How can you configure the queuing backend for Active Job, both globally and on a per-job basis?
The queuing backend for Active Job can be configured globally in the Rails application configuration or on a per-job basis by setting the queue_adapter attribute. This allows flexibility in choosing the backend for different types of jobs.
What are hooks in Active Job, and how can you use them to trigger logic during the life cycle of a job?
Hooks in Active Job are methods that can be registered to trigger logic at specific points during the life cycle of a job, such as before or after execution. They provide a way to encapsulate common functionality and perform tasks like logging or error handling.
How does Active Job integrate with Action Mailer, and what are the benefits of using asynchronous email delivery?
Active Job integrates with Action Mailer to support asynchronous email delivery, allowing emails to be sent outside of the request-response cycle using the deliver_later method. This improves application responsiveness by offloading email sending tasks to background processing.
How does Active Job handle internationalization, and how does it affect asynchronous tasks like sending emails?
Active Job handles internationalization by using the I18n.locale set at the time the job is created, ensuring that tasks like sending emails are localized according to the specified locale.
What types of arguments does Active Job support by default, and how can you extend the list of supported argument types?
Active Job supports various types of arguments by default, including basic types, symbols, dates, times, arrays, hashes, and more. The list of supported argument types can be extended by defining custom serializers.
How does Active Job handle exceptions during job execution, and what options are available for retrying or discarding failed jobs?
Active Job handles exceptions during job execution by providing options for retrying or discarding failed jobs. Exceptions can be rescued using rescue_from and retried using retry_on or discarded using discard_on.
