Ruby on rails interview questions and Answers

Ruby on Rails is an open-source web development tool that is built on top of Ruby programming language. Designed around productivity and simplicity, this framework gives developers a structure for writing code for building websites and web applications.

David Heinemeier Hansson

• Integrated application
• Default configuration saves a lot of time and work.
• Great ecosystem helps you find online tools & support.
• Active development status keeps introducing fixes & adding features.
• Testing frameworks are strong.

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Class libraries consist of many domains including thread programming, data types, and various domains.

• In Variables, all letters must be lowercase and words should be separated by underscores.
• Modules and Classes use MixedCase and no underscore is required. Each word must start with uppercase.
• The database table name should have a mix of lowercase and underscore, and all names should be in the plural form.
• Model is represented by MixedCase and has singular table name.
• The names of Controller are in plural form.

ORM indicate that classes are mapped to the table in the database, and objects are mapped to the rows.

False indicates a Boolean datatype, and Nil is not a data type and it have an object_id 4.

App/controllers: A Controller handles the web request from the user. Rails search the controller sub-directory for controller classes.

App/helpers: This sub-directory holds helper classes that are used to assist the controller classes.

Symbol belongs to the immutable objects category whereas Strings are mutable objects. Both symbol and strings act similarly, but they differ in behavior. The difference lies mainly in the memory object_id and process tune when you use them together.