CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-5marshallingruby-on-rails-6
techalicious
techalicious

Reputation: 441

Marshal Conflict between Rails/ActiveRecord versions

I'm trying to run Rails 5 and Rails 6 simultaneously and have encountered a caching issue when the Rails 5 & 6 versions of the project share the same external cache. After the Rails 5 version of the project caches an ActiveRecord object, when the Rails 6 version reads from the cache and tries to read cached_object.id, it returns nil. Interestingly enough, cached_object[:id] returns the correct value.

Our caching implementation uses Marshal under the hood to serialize/deserialize, so I was able to reproduce this without the cache dependency, as follows:

Given a project running Rails 5:

usr = User.find_by_id(1)
puts Marshal.dump(usr)

Copy and paste the result of Marshal.dump to another console running Rails 6:

usr = Marshal.load(<COPY_PASTE_STRING>)
usr.id // returns nil
usr[:id] // returns 1

The opposite doesn't seem to be true (ie. Marshal.dump in Rails 6 and Marshal.load in Rails 5 doesn't reproduce this)

Is anybody familiar with the Rails internals that might know what's going on here?

Upvotes: 4

Views: 681

Answers (1)

techalicious
techalicious

Reputation: 441

It turns out this behavior isn't an issue with Marshal, but rather a change in ActiveRecord in Rails 6.

Upvotes: 2

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