47 lines
1 KiB
Ruby
47 lines
1 KiB
Ruby
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# Copyright (C) 2012-2016 Zammad Foundation, http://zammad-foundation.org/
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module ApplicationModel::HasLatestChangeTimestamp
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extend ActiveSupport::Concern
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# methods defined here are going to extend the class, not the instance of it
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class_methods do
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=begin
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get latest updated_at object timestamp
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latest_change = Ticket.latest_change
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returns
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result = timestamp
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=end
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def latest_change
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key = "#{new.class.name}_latest_change"
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updated_at = Cache.get(key)
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# if we do not have it cached, do lookup
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if !updated_at
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o = select(:updated_at).order(updated_at: :desc).limit(1).first
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if o
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updated_at = o.updated_at
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latest_change_set(updated_at)
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end
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end
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updated_at
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end
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def latest_change_set(updated_at)
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key = "#{new.class.name}_latest_change"
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expires_in = 31_536_000 # 1 year
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if updated_at.nil?
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Cache.delete(key)
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else
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Cache.write(key, updated_at, { expires_in: expires_in })
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end
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end
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end
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end
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