Rails Model Methods not working well

Rails Model Methods not working well

References

Reference NO 1

http://stackoverflow.com/questions/15193350/rails-model-methods-not-working-well

Reference NO 2

http://stackoverflow.com/questions/9561844/self-find-method-active-model-in-rails-not-working

Reference NO 3

https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/issues/140

Reference NO 4

http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/

Reference NO 5

http://apidock.com/rails/ActiveRecord/Base/exists%3F/class

Reference NO 6

http://blog.steveklabnik.com/posts/2011-12-30-active-record-considered-harmful

Reference NO 7

http://edgeguides.rubyonrails.org/active_record_querying.html

Reference NO 8

https://www.ruby-forum.com/topic/4025611