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krisleech/notes.rb

Created April 25, 2019 09:09
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ActiveRecord locking
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notes.rb
# Prevent other processes/threads from updating rows, uses "FOR UPDATE" lock by default:
Recruitment::CpmsTotal.transaction do
totals = Recruitment::CpmsTotal.not_sent.lock.each # [1]
sleep(40)
end
# [1] each forces query to happen, #all on its own does not.
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