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Ruby On Rails Interview Questions and Answers

1
What does ruby name refers to?
  • Ruby names refer to the classes, variables, methods, constants and modules that help in the creation of the program.
  • These are the names that distinguish other names with the specified ruby names that are being mentioned above.
  • Ruby names are useful and used to be written as it is shown. They are useful in the context of writing the programs and while generating the module.
  • Ruby names refer to the classes that has to be built and through which the objects will be declared, and methods that will perform on the data that is given.
  • The names are reserved such that they can’t be used anywhere else and for any other purpose. The name that is used can be in lower or upper case, letter, number or an underscore.
2
The Purpose of Ruby Find

In order to retrieve or pull data from the Ruby on Rails database that’s built up as the Rails web application is first created and then utilized one or several methods of retrieving such data can be used. The collective name the Rails programming community, including its original creator David Hansson, has given to the methods for finding and then retrieving information from Rails is “Active Record.”
Information contained within Ruby on Rails is bundled in records. The beauty of Rails is that it allows the individual user, quite often before the programming language is even fully learned, to begin setting up various “find” or active record retrieval methods. Though on the surface, Ruby on Rails and its Ruby Find or active record database retrieval application sounds technically complicated, it’s actually relatively easy to learn

3
Explain what is Ruby on Rail?
  • Ruby: It is an object oriented programming language inspired by PERL and PYTHON.
  • Rail: It is a framework used for building web application
4
What is the difference between Symbol and String?

The symbol in Ruby on rails act the same way as the string but the difference is in their behaviors that are opposite to each other.

  • The difference remains in the object_id, memory and process time for both of them when used together at one time.
  • Strings are considered as mutable objects. Whereas, symbols, belongs to the category of immutable.
  • Strings objects are mutable so that it takes only the assignments to change the object information. Whereas, information of, immutable objects gets overwritten.
  • String objects are written like
  • p: “string object jack”.object_id #=>2250 or
    p: “string object jack”.to_sym.object_id #=> 2260, and
    p: “string object jack”. to_s_object_id #=> 2270

5
Why Ruby Find is So Useful

Most widely used computer programming languages use a method of database record retrieval called Structured Query Language, or SQL. SQL communicates with a computer database, basically, and tells the database to send records to the user making a request or query for the records. SQL is a standard language for most database management systems, though there are actually better, more efficient and more streamlined ways of managing database retrieval of information packets and records, especially when Ruby on Rails and its Ruby Find, or active record retrieval is used.

In the majority of active record retrieval cases when you use Ruby on Rails as your programming language you won’t even need to resort to SQL. If you’d like to create a web or blog application, for example, but don’t want to delve deeply into SQL, there are fewer betters ways of avoiding doing so than Rails and its active record or finder methods. Udemy.com offers an A to Z Rails and Ruby Find series of training courses, especially for beginners.

In fact, Ruby on Rails and its various Ruby Find or active record methods will do most of the queries or database retrieval requests for you and the Rails active finder is compatible, meaning it will easily blend in or interface with most popular database systems, including MySQL, PostgreSQL and SQLite, to name just a few. And no matter the particular database record storage and retrieval system you’re using, the Rails active record (Ruby Find) formal, or mode of usage, will always be the same. Active Record, or Ruby Find, in the Rails programming language allows use to easily perform many queries without having to pause to write or program anything using SQL, a bonus if you’re new to computer programming, at least as it applies to Rails and how it interfaces or melds with other programming and database management operations.

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