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    db_adapters.cr state_machine.cr value_object.cr visitor.cr db_adapters.rb log_decorator.rb validation.rb value_object.rb visitor.rb

  • db_adapters.rb

  • ¶

    This is a classic metaprogramming use case: Avoid repeating yourself when you need to initialize a class based on it’s name

    module Adapters
  class MysqlAdapter; end

  class PostgresAdapter; end

  class SqlserverAdapter; end

  class OracleAdapter; end
end
  • ¶

    Using const_get we can resolve a class name (a string), into a real reference to the class.

    def adapter(db_name)
  adapter_class_name = "#{db_name.capitalize}Adapter"

  Adapters.const_get(adapter_class_name)
end

p adapter(:sqlserver).new