Sinatra Framework Interview Questions for Beginners

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