rails cache unexpected side effects.rb

rails_cache_effects.rb

def get_data_no_marshal
    cache_key = 'Some random cache key'
    result = Rails.cache.fetch(cache_key, race_condition_ttl: 10) do
      # Load resource and pre-load associations
      Survey.includes(:survey_meta,
        :q_groups=>[
            :q_questions=>[
                :q_answers,
                :q_attributes
            ]
         ]).where(:sid=>sid.to_i).first
    end
end

result_1 = get_data_no_marshal()
result_2 = get_data_no_marshal()

puts result1.object_id
puts result2.object_id

# And there you have it. When I run this my objects will have the same object_id, 
# which is unfortunate, because the plan is to alter them and have them return 
# different results. The solution I came up with was Marshal!

def get_data_and_marshal
    cache_key = 'Some random cache key'
    result = Rails.cache.fetch(cache_key, race_condition_ttl: 10) do
      # Load resource and pre-load associations
      Survey.includes(:survey_meta,
        :q_groups=>[
            :q_questions=>[
                :q_answers,
                :q_attributes
            ]
         ]).where(:sid=>sid.to_i).first
    end
    result = Marshal.load(Marshal.dump(result))
end

result_1 = get_data_and_marshal()
result_2 = get_data_and_marshal()

puts result1.object_id
puts result2.object_id

#It adds a little bit of overhead, but it fixed the problem for me.