Fix: error when referencing thread attribute after Rails upgrade #39
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After Rails upgrade, this relies on a class variable. We can't define class variables once a class has been frozen, so we do that before.
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Thread attributes will now declare a class variable on the fly when referenced. This causes a problem if the class is frozen.
The patch is just referencing the attribute so that it gets materialized before having the class frozen.
CC @basecamp/sip