1 files changed, 31 insertions, 0 deletions
diff --git a/db/post_migrate/20200608205813_set_lock_version_to_not_null.rb b/db/post_migrate/20200608205813_set_lock_version_to_not_null.rb
new file mode 100644
index 00000000000..69f43a8decf
--- /dev/null
+++ b/db/post_migrate/20200608205813_set_lock_version_to_not_null.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class SetLockVersionToNotNull < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  TABLES = %w(epics merge_requests issues ci_stages ci_builds ci_pipelines).freeze
+  BATCH_SIZE = 10_000
+
+  disable_ddl_transaction!
+
+  def declare_class(table)
+    Class.new(ActiveRecord::Base) do
+      include EachBatch
+
+      self.table_name = table
+      self.inheritance_column = :_type_disabled # Disable STI
+    end
+  end
+
+  def up
+    TABLES.each do |table|
+      declare_class(table).where(lock_version: nil).each_batch(of: BATCH_SIZE) do |batch|
+        batch.update_all(lock_version: 0)
+      end
+    end
+  end
+
+  def down
+    # Nothing to do...
+  end
+end