Ruby on Rails Professional Standards & Competencies 2

Question 1

A Rails developer discovers a critical security vulnerability in a gem used by a client's production app. What is the professional best practice?

Accepted Answer

Notify the client immediately and provide a remediation plan

Answer

Professional responsibility requires immediate disclosure to the client with a clear remediation plan so they can make informed risk decisions.

Question 2

Which Rails convention promotes the 'Convention over Configuration' principle to reduce cognitive overhead for team members?

Accepted Answer

Placing models in app/models, controllers in app/controllers, and views in app/views

Answer

Rails' standard directory layout (app/models, app/controllers, app/views) is the canonical expression of Convention over Configuration, enabling any Rails developer to navigate any Rails project.

Question 3

When writing Rails migrations on a team, why should you never edit a migration that has already been committed and run in production?

Accepted Answer

Because other developers' schema versions will diverge and rollback becomes unreliable

Answer

Editing a previously-run migration breaks the shared schema history, making rollbacks and recreating databases from scratch unreliable for all team members.

Question 4

A colleague submits a PR with 2,000-line controller actions containing business logic. What is the professional Rails standard response?

Accepted Answer

Request a refactor extracting logic into service objects or models per the Skinny Controller principle

Answer

The Rails community standard 'Skinny Controller, Fat Model' calls for business logic to live in models or service objects, and a code review is the right venue for this feedback.

Question 5

What does it mean professionally to 'own' a Rails feature end-to-end?

Accepted Answer

Taking responsibility for design, implementation, testing, deployment, and monitoring of the feature

Answer

Professional feature ownership means a developer is accountable for the entire lifecycle, from implementation through production health, not just writing the initial code.

Ruby on Rails Practice Test

Ruby on Rails Practice Test

Ruby on Rails Professional Standards & Competencies 2