Add currency to subscriptions

app/models/solidus_subscriptions/subscription.rb

@@ -26,6 +26,7 @@ class Subscription < ApplicationRecord
     validates :interval_length, numericality: { greater_than: 0 }
     validates :payment_method, presence: true, if: -> { payment_source }
     validates :payment_source, presence: true, if: -> { payment_method&.source_required? }
+    validates :currency, inclusion: { in: ::Money::Currency.all.map(&:iso_code) }
 
     accepts_nested_attributes_for :shipping_address
     accepts_nested_attributes_for :billing_address

config/locales/en.yml

@@ -114,3 +114,5 @@ en:
               exceeded: >
                 This subscription has exceeded the maximum configured skip
                 limit. It can no longer be skipped.
+            currency:
+              inclusion: "is not a valid currency code"

db/migrate/20210205140422_add_currency_to_subscription.rb

@@ -0,0 +1,5 @@
+class AddCurrencyToSubscription < ActiveRecord::Migration[5.2]
+  def change
+    add_column :solidus_subscriptions_subscriptions, :currency, :string
+  end
+end

lib/solidus_subscriptions/checkout.rb

@@ -37,7 +37,8 @@ def create_order
         email: installment.subscription.user.email,
         store: installment.subscription.store || ::Spree::Store.default,
         subscription_order: true,
-        subscription: installment.subscription
+        subscription: installment.subscription,
+        currency: installment.subscription.currency
       )
     end
 

lib/solidus_subscriptions/subscription_generator.rb

@@ -29,6 +29,7 @@ def activate(subscription_line_items)
         billing_address: order.bill_address,
         payment_source: order.payments.valid.last&.payment_source,
         payment_method: order.payments.valid.last&.payment_method,
+        currency: order.currency,
         **configuration.to_h
       }
 

lib/solidus_subscriptions/testing_support/factories/subscription_factory.rb

@@ -5,6 +5,7 @@
     store
     interval_length { 1 }
     interval_units { :month }
+    currency { 'USD' }
 
     user do
       new_user = create(:user, :subscription_user)

spec/lib/solidus_subscriptions/checkout_spec.rb

@@ -22,6 +22,7 @@
       expect(order.bill_address.value_attributes).to eq(subscription.billing_address_to_use.value_attributes)
       expect(order.payments.first.payment_method).to eq(subscription.payment_method_to_use)
       expect(order.payments.first.source).to eq(subscription.payment_source_to_use)
+      expect(order.currency).to eq(subscription.currency)
       expect(order.user).to eq(subscription.user)
       expect(order.email).to eq(subscription.user.email)
     end

spec/lib/solidus_subscriptions/subscription_generator_spec.rb

@@ -25,6 +25,7 @@
         interval_units: subscription_line_item.interval_units,
         end_date: subscription_line_item.end_date,
         store: subscription_line_item.order.store,
+        currency: subscription_line_item.order.currency
       )
     end
 

spec/models/solidus_subscriptions/subscription_spec.rb

@@ -6,9 +6,14 @@
   it { is_expected.to validate_presence_of :successive_skip_count }
   it { is_expected.to validate_numericality_of(:skip_count).is_greater_than_or_equal_to(0) }
   it { is_expected.to validate_numericality_of(:successive_skip_count).is_greater_than_or_equal_to(0) }
-
   it { is_expected.to accept_nested_attributes_for(:line_items) }
 
+  it 'validates currency correctly' do
+    expect(subject).to validate_inclusion_of(:currency).
+      in_array(::Money::Currency.all.map(&:iso_code)).
+      with_message('is not a valid currency code')
+  end
+
   describe 'creating a subscription' do
     it 'tracks the creation' do
       stub_const('Spree::Event', class_spy(Spree::Event))