Sinatra Framework Interview Questions

Sinatra is a lightweight web application framework. It is especially, designed to be simple and flexible, with a small codebase and minimal dependencies. It is often used for building simple web applications and APIs due to its simplicity and ease of use. Compared to other web frameworks like Ruby on Rails, Sinatra is considered to be a lightweight alternative that provides a simpler API and requires less configuration.

The main advantage of using the Sinatra framework is its simplicity and ease of use. Sinatra is a lightweight web framework that has a small codebase and a simple API, which makes it easy for developers to learn and use. Sinatra allows developers to build web applications quickly and easily, without the overhead and complexity of larger frameworks like Ruby on Rails. Sinatra also provides a lot of flexibility, allowing developers to choose their own libraries and tools to build their applications. This simplicity and flexibility make Sinatra well-suited for building small to medium-sized web applications and APIs.

Sinatra Framework may not be suitable for large, complex applications that require more advanced features.

No, but Sinatra can be easily integrated with various database systems like MySQL, PostgreSQL, or MongoDB.

There are many web applications that have been built using Sinatra. Here are a few examples:

• GitHub's Gist
• Heroku Dashboard
• Ruby Toolbox
• Basecamp
• Groupon, etc.

The purpose of the Sinatra framework is to provide a simple and flexible way to build web applications and APIs. Sinatra is a lightweight web framework that is designed to be easy to learn and use. It provides a minimalistic API that allows developers to quickly build web applications without the overhead and complexity of larger frameworks like Ruby on Rails.

Sinatra is web application framework for rapidly building applications in Ruby.Sinatra is a domain specific language or DSL which means it is designed from the ground up to build applications with minimal efforts.It is written in Ruby and an alternative to Ruby web application frameworks such as Ruby on Rails, Merb, Nitro, and Camping.

By default, Sessions are disabled in Sinatra.You need to enable them and then use the session hash from routes and views. Below code shows how to enable, set or get a session in Sinatra.

//Enabling Session

enable :sessions

get '/foo' do
  // setting session value
  session[:message] = 'Hello World!'
  redirect to('/bar')
end

get '/bar' do
 // getting session value
  session[:message]   # => 'Hello World!'
end

Rack:: Flash is used to flash a message in Sinatra.
Example Usage :

require 'sinatra/base'
require 'rack-flash'

class MyApp < Sinatra::Base enable :sessions use Rack::Flash post '/set-flash' do # Set a flash entry flash[: notice] = "Thanks for signing up!" # Get a flash entry flash[:notice] # => "Thanks for signing up!"
    
    # Set a flash entry for only the current request
    flash.now[: notice] = "Thanks for signing up!"
  end
end

The request object probably has what you’re looking for:

get '/hello-world' do
  request.path_info   # => '/hello-world'
  request.fullpath    # => '/hello-world?foo=bar'
  request.url         # => 'http://example.com/hello-world?foo=bar'
end