1 files changed, 39 insertions, 0 deletions
diff --git a/db/migrate/20201005092709_remove_compliance_frameworks_group_id_fk.rb b/db/migrate/20201005092709_remove_compliance_frameworks_group_id_fk.rb
new file mode 100644
index 00000000000..88c019c849e
--- /dev/null
+++ b/db/migrate/20201005092709_remove_compliance_frameworks_group_id_fk.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+class RemoveComplianceFrameworksGroupIdFk < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_compliance_management_frameworks_on_group_id_and_name'.freeze
+
+  class TmpComplianceFramework < ActiveRecord::Base
+    self.table_name = 'compliance_management_frameworks'
+
+    include EachBatch
+  end
+
+  disable_ddl_transaction!
+
+  def up
+    TmpComplianceFramework.each_batch(of: 100) do |query|
+      query.update_all('namespace_id = group_id') # Copy data in case we rolled back before...
+    end
+
+    change_column_null(:compliance_management_frameworks, :group_id, true)
+
+    remove_foreign_key_if_exists(:compliance_management_frameworks, :namespaces, column: :group_id)
+    remove_concurrent_index_by_name(:compliance_management_frameworks, INDEX_NAME)
+  end
+
+  def down
+    # This is just to make the rollback possible
+    TmpComplianceFramework.each_batch(of: 100) do |query|
+      query.update_all('group_id = namespace_id') # The group_id column is not in used at all
+    end
+
+    change_column_null(:compliance_management_frameworks, :group_id, false)
+
+    add_concurrent_foreign_key(:compliance_management_frameworks, :namespaces, column: :group_id, on_delete: :cascade)
+    add_concurrent_index(:compliance_management_frameworks, [:group_id, :name], unique: true, name: INDEX_NAME)
+  end
+end