Introduce Class Annotation

You have a method whose implementation steps are so common that they can safely be hidden away.

Declare the behavior by calling a class method from the class definition.

class SearchCriteria...

    def initialize(hash)
      @author_id = hash[:author_id]
      @publisher_id = hash[:publisher_id]
      @isbn = hash[:isbn]
    end 
  

class SearchCriteria...
  
  hash_initializer :author_id, :publisher_id, :isbn