1 files changed, 35 insertions, 0 deletions
diff --git a/db/migrate/20170703102400_add_stage_id_foreign_key_to_builds.rb b/db/migrate/20170703102400_add_stage_id_foreign_key_to_builds.rb
new file mode 100644
index 00000000000..68b947583d3
--- /dev/null
+++ b/db/migrate/20170703102400_add_stage_id_foreign_key_to_builds.rb
@@ -0,0 +1,35 @@
+class AddStageIdForeignKeyToBuilds < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    unless index_exists?(:ci_builds, :stage_id)
+      add_concurrent_index(:ci_builds, :stage_id)
+    end
+
+    unless foreign_key_exists?(:ci_builds, :stage_id)
+      add_concurrent_foreign_key(:ci_builds, :ci_stages, column: :stage_id, on_delete: :cascade)
+    end
+  end
+
+  def down
+    if foreign_key_exists?(:ci_builds, :stage_id)
+      remove_foreign_key(:ci_builds, column: :stage_id)
+    end
+
+    if index_exists?(:ci_builds, :stage_id)
+      remove_concurrent_index(:ci_builds, :stage_id)
+    end
+  end
+
+  private
+
+  def foreign_key_exists?(table, column)
+    foreign_keys(:ci_builds).any? do |key|
+      key.options[:column] == column.to_s
+    end
+  end
+end