Saturday, January 17, 2015
I am seeing an unusual hiccup related to Active Record Session store that happens intermittently (and I am unable to reproduce locally):
NoMethodError: undefined method `delete' for nil:NilClass
Rails: 3.2.21
(I am running Spree 2.0.13.beta)
I am using active_record_store and the stacktrace does not pass through my app. Interestingly, the stacktrace passes thruogh active_record/session_store.rb code (see full stacktrace https://gist.github.com/jasonfb/817b37e262e8247e85a2)
Some observations:
• I tried logging in as this user and also hijacking the user's session by record id (moving a fake session id into the sessin id & data fields of the session where the symptom is) -- I was unable to reproduce this in dev completely.
• This happening on different users on different places in my app (occurance is 1 in several thousand hits).
• It looks like it happens for the same user a couple of times in a row (makes sense if they load more than 1 page with the same session problem)
• Examining the sessions table for the sessions where the problem is happening I see that the 'data' field is very large for these records, for example: https://gist.github.com/jasonfb/109af1b7f1595c115c85
All of the records with bad sessions have a very large amount of data in them, whereas my other session records look to have just a few lines of data in them.
Any suggestions for a remedy here?
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