Abstract class not loaded properly in Rails

Abstract class not loaded properly in Rails

References

Reference NO 1

http://stackoverflow.com/questions/15187456/abstract-class-not-loaded-properly-in-rails

Reference NO 2

http://stackoverflow.com/questions/17778552/rails-article-all-works-class-method-therein-does-not

Reference NO 3

http://stackoverflow.com/questions/5169372/rails-3-abstract-class-vs-inherited-class

Reference NO 4

http://stackoverflow.com/questions/13912268/opposite-of-includes-in-rails

Reference NO 5

https://www.ruby-forum.com/topic/165221

Reference NO 6

https://github.com/rails/rails/issues/552

Reference NO 7

http://apidock.com/rails/ActiveRecord/Associations/ClassMethods/has_many

Reference NO 8

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