Implement custom Marshal encoder/decoder for StripeObject

lib/stripe/stripe_object.rb

@@ -144,6 +144,28 @@ def dirty!
       end
     end
 
+    # Implements custom encoding for Ruby's Marshal. The data produced by this
+    # method should be comprehendable by #marshal_load.
+    #
+    # This allows us to remove certain features that cannot or should not be
+    # serialized.
+    def marshal_dump
+      # The StripeClient instance in @opts is not serializable and is not
+      # really a property of the StripeObject, so we exclude it when
+      # dumping
+      opts = @opts.clone
+      opts.delete(:client)
+      [@values, opts]
+    end
+
+    # Implements custom decoding for Ruby's Marshal. Consumes data that's
+    # produced by #marshal_dump.
+    def marshal_load(data)
+      values, opts = data
+      initialize(values[:id])
+      initialize_from(values, opts)
+    end
+
     def serialize_params(options = {})
       update_hash = {}
 

test/stripe/stripe_object_test.rb

@@ -410,5 +410,18 @@ class StripeObjectTest < Test::Unit::TestCase
       end
       assert_match(/\(object\).foo = nil/, e.message)
     end
+
+    should "marshal and unmarshal using custom encoder and decoder" do
+      obj = Stripe::StripeObject.construct_from(
+        { id: 1, name: "Stripe" },
+        api_key: "apikey",
+        client: StripeClient.active_client
+      )
+      m = Marshal.load(Marshal.dump(obj))
+      assert_equal 1, m.id
+      assert_equal "Stripe", m.name
+      expected_hash = { api_key: "apikey" }
+      assert_equal expected_hash, m.instance_variable_get("@opts")
+    end
   end
 end