Rails 3 validates numericality throws argument error when blank/nil

Rails 3 validates numericality throws argument error when blank/nil

References

Reference NO 1

http://stackoverflow.com/questions/13635399/rails-3-validates-numericality-throws-argument-error-when-blank-nil

Reference NO 2

http://stackoverflow.com/questions/5208895/numericality-validations-catching-nil-values-on-comparisons

Reference NO 3

http://apidock.com/rails/ActiveModel/Validations/ClassMethods/validates

Reference NO 4

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

Reference NO 5

http://livevalidation.com/documentation

Reference NO 6

http://anilpunjabi.tumblr.com/post/25948339235

Reference NO 7

http://www.iprophesy.net/web-development/24-i-dont-like-rails.html

Reference NO 8

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