Simply use OpenStruct#to_h to receive an OpenStruct's hash representation.
In older Rubies you need OpenStruct#marshal_dump instead.

Ruby 2.0+

>> OpenStruct.new(foo: 23, bar: 42).to_h
=> { :foo => 23, :bar => 42 }

Ruby 1.9.3 and 1.8.7

>> OpenStruct.new(:foo => 23, :bar => 42).marshal_dump
=> { :foo => 23, :bar => 42 }

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Both approaches will return the underlying hash table (a clone of it in Ruby 2.0+).