1 files changed, 31 insertions, 0 deletions
diff --git a/db/migrate/20210203092549_restore_has_external_wiki_default_value.rb b/db/migrate/20210203092549_restore_has_external_wiki_default_value.rb
new file mode 100644
index 00000000000..37111b370a5
--- /dev/null
+++ b/db/migrate/20210203092549_restore_has_external_wiki_default_value.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class RestoreHasExternalWikiDefaultValue < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  class TmpProject < ActiveRecord::Base
+    self.table_name = 'projects'
+  end
+
+  # This reverts the following migration: change_column_default(:projects, :has_external_wiki, from: nil, to: false)
+  # We only change the column when the current default value is false
+  def up
+    # Find out the current default value
+    column = TmpProject.columns.find { |c| c.name == 'has_external_wiki' }
+    return unless column
+
+    if column.default == 'false'
+      with_lock_retries do
+        change_column_default(:projects, :has_external_wiki, from: false, to: nil)
+      end
+    end
+  end
+
+  def down
+    # no-op
+  end
+end