Important - very important questions in rails

 what is ruby on rails 

ruby :  it is object oriented programming language inspired by PERL and Python. 

rails : it is a framework used for building web application 

what is class libraries in ruby

mention what is the naming convention in rails

variables :for declaring variables .all letters are lowercase and words are seperated by underscroes.

class and module : modules and classes uses mixed case and have no underscore , each words starts with a uppercase letter.

database table : the database table name 

model :

controller :

what is yield in rails 

what is object relationship model in rails

ORM or object relationship model in rails indicate that your classes are mapped to the table in the database , and objects are directly mapped to the rows in the table .

what the difference is between false and nil in ruby

in ruby false indicates a boolean datatype  ,  while nil is not a datatype,it have an object_id 4

mention what are the positive aspects in rails 

what is the role of sub-directory app/controllers and app/helpers

what is the difference between string and symbol

what is rails active record in rubyonrails ::

rails active record is the object /relational mapping - orm layer supplied with rails , it follows the standard orm model as :

table map to classes

rows map to objects 

column map to object attributes