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Sometimes it's useful to have a field in your ActiveRecord implentation that isn't actually selected in your query or present in your table. One way to acheive this is by simply adding a new accessor to your Model class.

Let's say we have a table named Customers that has a firstname and lastname column but we would like to also have a fullname column available to us when doing things like iterating through Customer objects in our view. One way is to add it directly to our Customers class ( app/model/customer.rb in your rails app).

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