Ruby on Rails

I have such action in my controller:

def my

      @user = Ads::User.find current_user.id

      @postings = Rails.cache.fetch("@user.postings.includes(:category)") do

        @postings = @user.postings.includes(:category)

      end

end

I'm trying to cache @postings and get such error:

Marshalling error for key '@user.postings.includes(:category)': can't dump anonymous class #<Module:0x000000048f9040>

You are trying to cache a Ruby object which cannot be serialized to memcached.

If I try to cache @postings without includes there are no errors. Can't figure out what is the problem

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