Ruby on Rails, or simply Rails, is a server-side web application framework written in Ruby under the MIT License. Rails is a model–view–controller (MVC) framework, providing default structures for a database, a web service, and web pages.
• What is Ruby on Rails?
• Overview of Rails Components
• Installing Rails
• A Simple Rails Application
• Starting the Rails Server
• Static Pages Within a Rails Application
• The Structure of a Rails Application
• Generating a Controller
• Rendering the View
• Adding a Static Page
• Dynamic Pages with Embedded Ruby
• Using the render Method
• Using the link_to Method
Rails and HTML Forms
• A Basic HTML Form
• Processing an HTML Form
• Working With Form Data
• Other Form Elements
• Form Tag Helpers
Databases and Rails
• Review of the MVC Architecture
• Entities and Relationships
• Databases and Models
• Rails Database Conventions
• Adding a Model
• Database Migrations
• The Rails Database Console
• Creating a Rails View of a Database Table
• Restful Routes and Resources
Form Helpers and Validation
• Form Helpers and form_for
• Processing Form Helpers
• From Form to Database
• Data Validation
• Validation Helpers
• The presence Validator
• The numericality Validator
• The uniqueness Validator
• The length Validator
• The format Validator
• Custom Validation Methods
• The errors Object
• Displaying Validation Errors in the View
Adding Style to an Application
• Rails and Sass
• Cascading Style Sheets
• Configuring an Application for Sessions
• Registering Users
• The Register Action
• The flash Hash
• Validating the Registration
• Logging in
• Logging Out
• Protected Pages
Putting it All Together
• The Business Application
• Database Terminology
• Linking Two Models
• Adding Tasks
• The Database Tables
• Displaying Employee Tasks
• Deleting a Task
• Listing Employees and Tasks
• Editing a Record
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Ruby: It is an object oriented programming language inspired by PERL and PYTHON.
Rails: It is a framework used for building web application
Explain what is class libraries in Ruby?
Class libraries in Ruby consist of a variety of domains, such as data types, thread programming, various domains, etc.
Explain what is “Yield” in Ruby on Rails?
Ruby method that receives a code block invokes it by calling it with the “Yield”.
Mention what the difference is between false and nil in Ruby?
In Ruby False indicates a Boolean datatype, while Nil is not a data type, it have an object_id 4
Explain what is the role of sub-directory app/controllers and app/helpers?
App/controllers: A web request from the user is handled by the Controller. The controller sub-directory is where Rails looks to find controller classes
App/helpers: The helper’s sub-directory holds any helper classes used to assist the view, model and controller classes.
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Ruby on Rails Demo
Ruby on Rails Modules
Hadoop framework includes following four modules:
Hadoop Common: These are Java libraries and utilities required by other Hadoop modules. These libraries provides filesystem and OS level abstractions and contains the necessary Java files and scripts required to start Hadoop.
Hadoop YARN: This is a framework for job scheduling and cluster resource management.
Hadoop Distributed File System (HDFS™): A distributed file system that provides high-throughput access to application data.
Hadoop MapReduce: This is YARN-based system for parallel processing of large data sets.