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37 interview questions on Ruby on Railsfor developers (2025)

Test your technical skills before an interview of Ruby on Rails with 37 corrected questions. Beginner, Intermediate or Expert level.

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37 questions
Medium
2 votes130 runs0 comment

Create a Rails controller with a bar action and a value parameter.

Back-end developer
rails
routes
views
Olivier Millaat Nov 11, 2021
Hard
2 votes85 runs0 comment

Create a user in Rails with a validation error

Back-end developer
rails
validations
Inconnuat Jan 5, 2022
Hard
1 vote132 runs0 comment

Rails: The #create action raises an exception if the request parameters do not contain a :foo key.

Back-end developer
rails
action
parameters
Olivier Millaat Dec 2, 2021
Hard
1 vote125 runs0 comment

Use the I18n gem to translate a string, a date and a pluralized string in Rails

Back-end developer
rails
i18n
Olivier Millaat Nov 11, 2021
Medium
1 vote118 runs0 comment

What is the effect of setting config.eager_load = true in Rails?

Back-end developer
rails
config
Olivier Millaat Dec 2, 2021
Hard
1 vote117 runs0 comment

How to call a method in a Rails class

Back-end developer
rails
class
method
Olivier Millaat Dec 2, 2021
Hard
1 vote97 runs0 comment

This query is already protected against SQL injection.

Back-end developer
rails
sql
Inconnuat Jan 5, 2022
Hard
1 vote91 runs0 comment

Translate the string 'hello_world' to French in Rails

Back-end developer
rails
i18n
Inconnuat Jan 5, 2022
Medium
1 vote86 runs0 comment

What are the columns of the users table in Rails?

Back-end developer
rails
models
Inconnuat Jan 5, 2022
Medium
1 vote84 runs0 comment

How to execute Ruby code without displaying it.

Back-end developer
rails
ruby
Inconnuat Jan 5, 2022
Expert
0 vote135 runs0 comment

Write a Rails controller and view that renders a list of foos.

Back-end developer
rails
layout
partial
Olivier Millaat Dec 2, 2021
Hard
0 vote135 runs0 comment

Rails validations: :state, :inclusion, :valid?

Back-end developer
rails
validations
Olivier Millaat Nov 11, 2021
Easy
0 vote127 runs0 comment

How to call a method before every action in a Rails controller

Back-end developer
rails
before_action
Clément Devos (W3D Team)at Nov 28, 2022
Medium
0 vote126 runs0 comment

Add subfolders of app/models to the list of paths to load at application startup

Back-end developer
rails
models
Olivier Millaat Dec 2, 2021
Medium
0 vote125 runs0 comment

How to make a method available in all views in Rails

Back-end developer
rails
views
Olivier Millaat Dec 2, 2021
Medium
0 vote124 runs1 comment

Return all Bar objects whose foos have data set to true.

Back-end developer
rails
joins
where
Olivier Millaat Nov 11, 2021
Hard
0 vote122 runs0 comment

Explain the difference between bundle install and bundle exec in Rails

Back-end developer
bundler
gems
Olivier Millaat Dec 2, 2021
Medium
0 vote121 runs0 comment

foo = Foo.create calls the callbacks :init, :after and :before,If :before returns false, the execution chain is stopped and the object is not created in the database.

Back-end developer
rails
callbacks
Olivier Millaat Dec 2, 2021
Hard
0 vote121 runs0 comment

If a request to the FooController#index action is made, :check_request is called, @index is available from the controller's index.html.erb view, @var is available from the controller's index.html.erb view

Back-end developer
rails
controller
action
Olivier Millaat Nov 26, 2021
Easy
0 vote120 runs0 comment

Calling user.foos executes a single database query

Back-end developer
rails
associations
Olivier Millaat Nov 11, 2021