38 interview questions on Ruby on Rails for developers (2025)

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38 interview questions on Ruby on Railsfor developers (2025)

Test your technical skills before an interview of Ruby on Rails with 38 corrected questions. Beginner, Intermediate or Expert level.

38 interview questions on Ruby on Railsfor developers (2025)

Test your technical skills before an interview of Ruby on Rails with 38 corrected questions. Beginner, Intermediate or Expert level.

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

Create a user in Rails with a validation error

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

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

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

Write a Rails app that has a model, a controller, and a view.

How to call a method in a Rails class

This query is already protected against SQL injection.

Translate the string 'hello_world' to French in Rails

How to execute Ruby code without displaying it.

What are the columns of the users table in Rails?

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

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

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

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

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

How to make a method available in all views in Rails

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

Calling user.foos executes a single database query

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.