1 files changed, 27 insertions, 0 deletions
diff --git a/lib/gitlab/serializer/ci/variables.rb b/lib/gitlab/serializer/ci/variables.rb
new file mode 100644
index 00000000000..c059c454eac
--- /dev/null
+++ b/lib/gitlab/serializer/ci/variables.rb
@@ -0,0 +1,27 @@
+module Gitlab
+  module Serializer
+    module Ci
+      # This serializer could make sure our YAML variables' keys and values
+      # are always strings. This is more for legacy build data because
+      # from now on we convert them into strings before saving to database.
+      module Variables
+        extend self
+
+        def load(string)
+          return unless string
+
+          object = YAML.safe_load(string, [Symbol])
+
+          object.map do |variable|
+            variable[:key] = variable[:key].to_s
+            variable
+          end
+        end
+
+        def dump(object)
+          YAML.dump(object)
+        end
+      end
+    end
+  end
+end