Re-allow appearances.description_html to be NULLrevert-appearances-description-html-not-null

This column isn't always set (e.g. when upgrading from older instances)
and technically it could be NULL (e.g. when flushing the cache).

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/36919

1 files changed, 18 insertions, 0 deletions

diff --git a/db/migrate/20170824162758_allow_appearances_description_html_null.rb b/db/migrate/20170824162758_allow_appearances_description_html_null.rb
new file mode 100644
index 00000000000..d7f481ee894
--- /dev/null
+++ b/db/migrate/20170824162758_allow_appearances_description_html_null.rb
@@ -0,0 +1,18 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AllowAppearancesDescriptionHtmlNull < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  def up
+    change_column_null :appearances, :description_html, true
+  end
+
+  def down
+    # This column should not have a `NOT NULL` class, so we don't want to revert
+    # back to re-adding it.
+  end
+end