1 files changed, 32 insertions, 0 deletions
diff --git a/lib/gitlab/background_migration/add_projects_emails_enabled_column_data.rb b/lib/gitlab/background_migration/add_projects_emails_enabled_column_data.rb
new file mode 100644
index 00000000000..a0ce5d22597
--- /dev/null
+++ b/lib/gitlab/background_migration/add_projects_emails_enabled_column_data.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module BackgroundMigration
+    # Iterates through the Projects table and attempts to set the
+    # opposite of the value of the column "emails_disabled" to a new
+    # column in project_settings called emails_enabled
+    class AddProjectsEmailsEnabledColumnData < BatchedMigrationJob
+      feature_category :database
+      operation_name :add_projects_emails_enabled_column_data
+
+      # Targeted table
+      class ProjectSetting < ApplicationRecord
+        self.table_name = 'project_settings'
+      end
+
+      def perform
+        each_sub_batch do |sub_batch|
+          plucked_list = sub_batch.where('NOT emails_disabled IS NULL').pluck(:id, :emails_disabled)
+          next if plucked_list.empty?
+
+          ApplicationRecord.connection.execute <<~SQL
+                  UPDATE project_settings
+                  SET emails_enabled=NOT subquery.emails_enabled
+                  FROM (SELECT * FROM (#{Arel::Nodes::ValuesList.new(plucked_list).to_sql}) AS updates(project_id, emails_enabled)) AS subquery
+                  WHERE project_settings.project_id=subquery.project_id
+          SQL
+        end
+      end
+    end
+  end
+end