Skip to main content

Ruby on Rails Interview Questions

What is Rails?
Ruby on Rails is an open source web application framework for the Ruby programming language............
Describe class libraries in Ruby.
The Ruby standard library extends the foundation of the Ruby built-in library with classes and abstractions for a variety of programming needs, including network programming, operating system services, threads, and more............
Explain the concepts and capabilities of garbage collection feature of Ruby.
Ruby is an object oriented language and every object oriented language tends to allocate many objects during execution of the program.............
Describe the environment variables present in Ruby.
RUBYOPT, RUBYLIB, RUBYPATH, RUBYSHELL,RUBYLIB_PREFIX...................
Interpolation is a very important process in Ruby, comment.
Interpolation is the process of inserting a string into a literal..............
What is the use of super in Ruby Rails? 
Ruby uses the super keyword to call the superclass implementation of the current method.............
What is the use of load and require in ruby? 
Reuire() loads and processes the Ruby code from a separate file, including whatever classes, modules, methods, and constants are in that file into the current scope..............
Explain the use of global variable $ in Ruby.
If you declare one variable as global we can access any where, where as class variable.............
Explain the difference between nil and false in ruby.  
False is a boolean datatype
Nil is not a data type..............

Comments

Post a Comment

Popular posts from this blog

Rails Migration Difference between Text and String

Rails Migration Difference between Text and String ? While working with Rails Migration Difference between Text and String is important to be known to every developer. Columns and their data types are finalized while deciding Table structure. This tutorial will help understand difference between String and Text column type and illustrate how to write Rails Migration implementing the same. You might want to read about database.yml files for specifying database configuration for Rails Application. 1. Concepts When String or Text data type is required?     Whenever you require your column to store information which is lengthy in size (Many characters), you need to consider String or Text data type for the column.     Both of them let you store Many(How Many - will see later) characters Difference between String and Text Considering MySQL database Feature     String     Text Length     1 to 255     ...
Post a Comment
Read more

Error malloc(): memory corruption nginx with passenger?

Error malloc(): memory corruption nginx with passenger Passenger issue resolving steps :  sudo gem uninstall passenger(uninstall all passenger) sudo gem install passenger sudo passenger-install-nginx-module --auto --auto-download --prefix=/opt/nginx --extra-configure-flags=none Update nginx config file with new passenger version and restart the nginx
1 comment
Read more

rake db migrate with down, up, redo, rollback options in rails

rake db migrate with down, up, redo, rollback options ? rake db migrate - This can be used to migrate your production/test database using various options like up, down, step, redo, version etc. In this tutorial we will learn how all these options can be used with rake tool to migrate the database. What is rake? rake is basically ruby make. i.e. make tool for ruby It has similar functionality to the make tool that you may have used on unix based systems for comopiling running some kind of script. rake allows you to ruby particular task in the environment that you specify. How to Install rake? You can install rake by installing gem 'rake' as, gem install rake Above command will install the latest version of rake tool avaialable. Various rake db migrate commands Operation     Command     Description General     rake db:migrate     This will migrate your database by running migrations that are not run yet Running specific Migra...
Post a Comment
Read more