Add SubscriptionLineItems

The LineItem class is responsible for associating Line items to subscriptions.
It tracks the following values:

[Spree::LineItem] :spree_line_item The spree object which created this instance

[SolidusSubscription::Subscription] :subscription The object responsible for
  grouping all information needed to create new subscription orders together

[Integer] :subscribable_id The id of the object to be added to new subscription
  orders when they are placed

[Integer] :quantity How many units of the subscribable should be included in
  future orders

[Integer] :interval How often subscription orders should be placed

[Integer] :installments How many subscription orders should be placed

1 files changed, 17 insertions, 0 deletions

diff --git a/db/migrate/20160825173548_create_solidus_subscriptions_line_items.rb b/db/migrate/20160825173548_create_solidus_subscriptions_line_items.rb
new file mode 100644
index 0000000..d79408e
--- /dev/null
+++ b/db/migrate/20160825173548_create_solidus_subscriptions_line_items.rb
@@ -0,0 +1,17 @@
+class CreateSolidusSubscriptionsLineItems < ActiveRecord::Migration
+  def change
+    create_table :solidus_subscriptions_line_items do |t|
+      t.references :spree_line_item, index: true, foreign_key: true, null: false
+      t.references :subscription, index: true
+      t.integer :quantity, null: false
+      t.integer :interval, null: false
+      t.integer :installments
+      t.integer :subscribable_id, index: true, null: false
+
+      t.timestamps null: false
+    end
+
+    add_index :solidus_subscriptions_line_items, :subscription_id, name: :index_line_items_on_subscription_id
+    add_foreign_key :solidus_subscriptions_line_items, :solidus_subscriptions_subscriptions, column: :subscription_id
+  end
+end