Avoid ActiveRecord::RecordNotFound

Rails4_ Avoid_ActiveRecord::RecordNotFound

#author = Author.find(id) throws ActiveRecord::RecordNotFound error.

#for one record
author = Author.find_by_id(id)

if !author.nil?
  #do something
else
  #do something
end


#for multiple record (find_all_by_id is deprecated in Rails 4)
authors = Author.where(:id => [id])
if !authors.empty?
  #do something
else
  #do something
end