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diff --git a/db/migrate/20160616084004_change_project_of_environment.rb b/db/migrate/20160616084004_change_project_of_environment.rb
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+++ b/db/migrate/20160616084004_change_project_of_environment.rb
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+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class ChangeProjectOfEnvironment < ActiveRecord::Migration
+ include Gitlab::Database::MigrationHelpers
+
+ # When using the methods "add_concurrent_index" or "add_column_with_default"
+ # you must disable the use of transactions as these methods can not run in an
+ # existing transaction. When using "add_concurrent_index" make sure that this
+ # method is the _only_ method called in the migration, any other changes
+ # should go in a separate migration. This ensures that upon failure _only_ the
+ # index creation fails and can be retried or reverted easily.
+ #
+ # To disable transactions uncomment the following line and remove these
+ # comments:
+ # disable_ddl_transaction!
+
+ def change
+ change_column_null :environments, :project_id, true
+ end
+end