Adding migration to explicitly grant VO permission where it is currently implicitly granted via managers/owners

In preparation for removing implicitly granted permissions

db/migrate/20160224034034_grant_explicit_variant_override_permissions.rb

@@ -0,0 +1,24 @@
+class GrantExplicitVariantOverridePermissions < ActiveRecord::Migration
+  def up
+    hubs = Enterprise.is_distributor
+
+    hubs.each do |hub|
+      next if hub.owner.admin?
+      explicitly_granting_producer_ids = hub.relationships_as_child
+        .with_permission(:create_variant_overrides).map(&:parent_id)
+
+      managed_producer_ids = Enterprise.managed_by(hub.owner).is_primary_producer.pluck(:id)
+      implicitly_granting_producer_ids = managed_producer_ids - explicitly_granting_producer_ids - [hub.id]
+
+      # create explicit VO permissions for producers currently granting implicit permission
+      Enterprise.where(id: implicitly_granting_producer_ids).each do |producer|
+        relationship = producer.relationships_as_parent.find_or_initialize_by_child_id(hub.id)
+        permission = relationship.permissions.find_or_initialize_by_name(:create_variant_overrides)
+        relationship.save! unless permission.persisted?
+      end
+    end
+  end
+
+  def down
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20160218235221) do
+ActiveRecord::Schema.define(:version => 20160224034034) do
 
   create_table "account_invoices", :force => true do |t|
     t.integer  "user_id",    :null => false