Encode arrays as hashes when needed

lib/stripe/invoice.rb

@@ -7,6 +7,7 @@ class Invoice < APIResource
     OBJECT_NAME = "invoice".freeze
 
     def self.upcoming(params, opts = {})
+      params[:subscription_items] = Util.array_to_hash(params[:subscription_items]) if params[:subscription_items]
       resp, opts = request(:get, upcoming_url, params, opts)
       Util.convert_to_stripe_object(resp.data, opts)
     end

lib/stripe/order.rb

@@ -12,10 +12,16 @@ def pay(params, opts = {})
     end
 
     def return_order(params, opts = {})
+      params[:items] = Util.array_to_hash(params[:items]) if params[:items]
       resp, opts = request(:post, returns_url, params, opts)
       Util.convert_to_stripe_object(resp.data, opts)
     end
 
+    def self.create(params = {}, opts = {})
+      params[:items] = Util.array_to_hash(params[:items]) if params[:items]
+      super(params, opts)
+    end
+
     private
 
     def pay_url

lib/stripe/subscription.rb

@@ -24,6 +24,16 @@ def self.create(params = {}, opts = {})
       super(params, opts)
     end
 
+    def serialize_params(options = {})
+      update_hash = super
+      if @unsaved_values.include?(:items)
+        value = Util.array_to_hash(@values[:items])
+        update_hash[:items] =
+          serialize_params_value(value, nil, true, options[:force], key: :items)
+      end
+      update_hash
+    end
+
     private
 
     def discount_url

test/stripe/subscription_test.rb

@@ -54,5 +54,51 @@ class SubscriptionTest < Test::Unit::TestCase
         assert subscription.is_a?(Stripe::Subscription)
       end
     end
+
+    context "#serialize_params" do
+      should "serialize when items is set to an Array" do
+        obj = Stripe::Util.convert_to_stripe_object({
+          object: "subscription",
+          items: Stripe::Util.convert_to_stripe_object(
+            object: "list",
+            data: []
+          ),
+        }, {})
+        obj.items = [
+          { id: "si_foo", deleted: true },
+          { plan: "plan_bar" },
+        ]
+
+        expected = {
+          items: {
+            :"0" => { id: "si_foo", deleted: true },
+            :"1" => { plan: "plan_bar" },
+          },
+        }
+        assert_equal(expected, obj.serialize_params)
+      end
+
+      should "serialize when items is set to a Hash" do
+        obj = Stripe::Util.convert_to_stripe_object({
+          object: "subscription",
+          items: Stripe::Util.convert_to_stripe_object(
+            object: "list",
+            data: []
+          ),
+        }, {})
+        obj.items = {
+          "0" => { id: "si_foo", deleted: true },
+          "1" => { plan: "plan_bar" },
+        }
+
+        expected = {
+          items: {
+            :"0" => { id: "si_foo", deleted: true },
+            :"1" => { plan: "plan_bar" },
+          },
+        }
+        assert_equal(expected, obj.serialize_params)
+      end
+    end
   end
 end