Add nested groups support on data leveldz-nested-groups

* add parent_id field to namespaces table to store relation with nested groups
* create routes table to keep information about full path of every group and project
* project/group lookup by full path from routes table

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/db/migrate/20161130095245_fill_routes_table.rb b/db/migrate/20161130095245_fill_routes_table.rb
new file mode 100644
index 00000000000..6754e583000
--- /dev/null
+++ b/db/migrate/20161130095245_fill_routes_table.rb
@@ -0,0 +1,21 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class FillRoutesTable < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = true
+  DOWNTIME_REASON = 'No new namespaces should be created during data copy'
+
+  def up
+    execute <<-EOF
+      INSERT INTO routes
+      (source_id, source_type, path)
+      (SELECT id, 'Namespace', path FROM namespaces)
+    EOF
+  end
+
+  def down
+    Route.delete_all(source_type: 'Namespace')
+  end
+end