Ruby on Rails Technology & Digital Applications 2

Question 1

Which Rails API endpoint format is recommended for building a JSON API consumed by a React frontend?

Accepted Answer

JSON:API specification with ActiveModel::Serializer or jsonapi-serializer

Answer

Rails commonly uses JSON:API spec with serializers like jsonapi-serializer to provide structured, consistent JSON responses for frontend clients.

Question 2

When integrating Stripe payments in a Rails app, which gem is the standard Ruby client?

Accepted Answer

stripe

Answer

The `stripe` gem is Stripe's official Ruby library used directly in Rails apps for payment processing.

Question 3

In a Rails 7 app using Hotwire, which component handles partial page updates without a full page reload?

Accepted Answer

Turbo Frames and Turbo Streams

Answer

Turbo Frames enable scoped partial updates and Turbo Streams push real-time changes, both part of Rails 7's Hotwire stack.

Question 4

Which Rails concern is used to add file attachment functionality to ActiveRecord models?

Accepted Answer

ActiveStorage::Attachment via has_one_attached or has_many_attached

Answer

Active Storage ships with Rails and uses `has_one_attached` / `has_many_attached` macros to associate files with models.

Question 5

How does Rails handle background job processing for sending emails asynchronously?

Accepted Answer

Via ActionMailer#deliver_later which enqueues an ActiveJob

Answer

`deliver_later` queues the email as an ActiveJob, allowing adapters like Sidekiq or Resque to process it outside the request cycle.

Ruby on Rails Practice Test