Prepare Interview

Exams Attended

Mock Exams

Make Homepage

Bookmark this page

Subscribe Email Address

Ruby On Rails Interview Questions and Answers

Intermediate / 1 to 5 years experienced level questions & answers

Ques 1. Explain the difference between a has_one and belongs_to association in Ruby on Rails.

has_one: Indicates a direct 1:1 relationship between objects where each instance of a model contains one instance of another model.
A product has_one provider, a customer has_one order.


Is it helpful? Add Comment View Comments
 

Ques 2. What is a Proc?

Procs, short for procedures, act similar to blocks, but can be saved as variables and reused. Think of them as blocks you can call over and over again on multiple arrays.

Is it helpful? Add Comment View Comments
 

Ques 3. What are the three levels of method access control for classes and what do they signify? What do they imply about the method?

  • Public, protected, and private.

  • Public methods can be called by all objects and subclasses of the class in which they are defined in.

  • Protected methods are only accessible to objects within the same class.

  • Private methods are only accessible within the same instance.

  • Be able to explain why this does (or doesn’t matter), and when you would want to set a method as private.

Is it helpful? Add Comment View Comments
 

Ques 4. What is the convention using ‘!’ at the end of method name?

The ! indicates that the method is about to change the object itself.

Here’s an example:

foo = "A TEST STRING"  # a string called foo

foo.downcase!     # modifies foo permanently
a test string

puts foo          # prints modified foo
a test string

Similarly if you did not want the object to be changed you could have something simple like:

foo2 = "A 2nd Test String"  # a string called foo 

foo2.downcase     # modifies foo temporarily
a 2nd test string 

puts foo2 nbsp;    # prints original foo 
A 2nd Test String

Is it helpful? Add Comment View Comments
 

Most helpful rated by users:

Related interview subjects

REST API interview questions and answers - Total 52 questions
Unix interview questions and answers - Total 105 questions
SDLC interview questions and answers - Total 75 questions
Apache Kafka interview questions and answers - Total 38 questions
Language in C interview questions and answers - Total 80 questions
ANT interview questions and answers - Total 10 questions
Nature interview questions and answers - Total 20 questions
Ruby On Rails interview questions and answers - Total 74 questions
Business Analyst interview questions and answers - Total 40 questions
HTML interview questions and answers - Total 27 questions
Hadoop interview questions and answers - Total 40 questions
iOS interview questions and answers - Total 52 questions
HR Questions interview questions and answers - Total 49 questions
C++ interview questions and answers - Total 142 questions
Cryptography interview questions and answers - Total 40 questions
JSON interview questions and answers - Total 16 questions
CSS interview questions and answers - Total 74 questions
XML interview questions and answers - Total 25 questions
Ethical Hacking interview questions and answers - Total 40 questions
Android interview questions and answers - Total 14 questions
ChatGPT interview questions and answers - Total 20 questions
Data Structures interview questions and answers - Total 49 questions
Zend Framework interview questions and answers - Total 24 questions
Fashion Designer interview questions and answers - Total 20 questions
©2023 WithoutBook