When we first moved excel generation off to a delayed job on survey-web, we had code that looked like this:
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responses = Response.where(:foo => bar)
Delayed::Job.enqueue(MyCustomJob.new(responses))
And this would bomb with an error like Can't dump anonymous Module.
After some time getting nowhere, we solved it like this:
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response_ids = Response.where(:foo => bar).map(&:id)
Delayed::Job.enqueue(MyCustomJob.new(response_ids))
And in the job:
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responses = Response.where('id in (?)', response_ids)
While refactoring a lot of that code over the last few days, we ran into the same issue. But with one difference. A controller spec was failing, but a test for the job which also passed a bunch of responses into it passed.
We wondered if maybe it was because we were passing a relation into the job instead of an array.
So we tried:
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responses = Response.where(:foo => bar).all
Delayed::Job.enqueue(MyCustomJob.new(responses))
And that worked great.
(The files in question are here and here).
Original post by Timothy Andrew - check out Timothy's Blog