Use parent strategy when building associations in factories

This avoids surprising scenarios where we expect a `create` call to
result in all records being persisted to the DB, while some associated
records are still unsaved.

This was especially problematic when building subscription line items,
because the order is retrieved through a `has_one :through` association
on the `Spree::LineItem` record. If the line item isn't saved, the order
cannot be retrieved, resulting in unexpected errors.

5 files changed, 11 insertions, 16 deletions

diff --git a/lib/solidus_subscriptions/testing_support/factories/installment_factory.rb b/lib/solidus_subscriptions/testing_support/factories/installment_factory.rb
index e8cea70..9914019 100644
--- a/lib/solidus_subscriptions/testing_support/factories/installment_factory.rb
+++ b/lib/solidus_subscriptions/testing_support/factories/installment_factory.rb
@@ -3,11 +3,11 @@ FactoryBot.define do
     transient {
       subscription_traits { [] }
     }
-    subscription { build :subscription, :with_line_item, *subscription_traits }
+    subscription { association(:subscription, :with_line_item, *subscription_traits) }
 
     trait :failed do
       actionable_date { Time.zone.yesterday }
-      details { build_list(:installment_detail, 1, installment: @instance) }
+      details { [association(:installment_detail, installment: @instance)] }
     end
 
     trait :success do
@@ -16,7 +16,7 @@ FactoryBot.define do
       end
 
       details do
-        build_list(:installment_detail, 1, :success, installment: @instance, order: order)
+        [association(:installment_detail, :success, installment: @instance, order: order)]
       end
     end
   end
diff --git a/lib/solidus_subscriptions/testing_support/factories/line_item_factory.rb b/lib/solidus_subscriptions/testing_support/factories/line_item_factory.rb
index 3f67ed0..51926a6 100644
--- a/lib/solidus_subscriptions/testing_support/factories/line_item_factory.rb
+++ b/lib/solidus_subscriptions/testing_support/factories/line_item_factory.rb
@@ -12,7 +12,7 @@ FactoryBot.define do
         subscription_traits { [] }
       end
 
-      subscription { build :subscription, *subscription_traits }
+      subscription { association :subscription, *subscription_traits }
     end
   end
 end
diff --git a/lib/solidus_subscriptions/testing_support/factories/spree/line_item_factory.rb b/lib/solidus_subscriptions/testing_support/factories/spree/line_item_factory.rb
index c40cafa..c9d1012 100644
--- a/lib/solidus_subscriptions/testing_support/factories/spree/line_item_factory.rb
+++ b/lib/solidus_subscriptions/testing_support/factories/spree/line_item_factory.rb
@@ -6,11 +6,9 @@ FactoryBot.modify do
       end
 
       subscription_line_items do
-        build_list(
-          :subscription_line_item,
-          n_subscription_line_items,
-          spree_line_item: @instance
-        )
+        Array.new(n_subscription_line_items) do
+          association :subscription_line_item, spree_line_item: @instance
+        end
       end
     end
   end
diff --git a/lib/solidus_subscriptions/testing_support/factories/spree/order_factory.rb b/lib/solidus_subscriptions/testing_support/factories/spree/order_factory.rb
index 4b373fb..3eca360 100644
--- a/lib/solidus_subscriptions/testing_support/factories/spree/order_factory.rb
+++ b/lib/solidus_subscriptions/testing_support/factories/spree/order_factory.rb
@@ -6,12 +6,9 @@ FactoryBot.modify do
       end
 
       line_items do
-        build_list(
-          :line_item,
-          n_line_items,
-          :with_subscription_line_items,
-          order: @instance
-        )
+        Array.new(n_line_items) do
+          association :line_item, :with_subscription_line_items, order: @instance
+        end
       end
     end
   end
diff --git a/lib/solidus_subscriptions/testing_support/factories/subscription_factory.rb b/lib/solidus_subscriptions/testing_support/factories/subscription_factory.rb
index 87fe75d..8660b13 100644
--- a/lib/solidus_subscriptions/testing_support/factories/subscription_factory.rb
+++ b/lib/solidus_subscriptions/testing_support/factories/subscription_factory.rb
@@ -17,7 +17,7 @@ FactoryBot.define do
         line_item_traits { [] }
       end
 
-      line_items { build_list :subscription_line_item, 1, *line_item_traits }
+      line_items { [association(:subscription_line_item, *line_item_traits)] }
     end
 
     trait :with_shipping_address do