47 lines
997 B
Ruby
47 lines
997 B
Ruby
# Copyright (C) 2012-2021 Zammad Foundation, http://zammad-foundation.org/
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module ApplicationModel::CanLatestChange
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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 = object.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 = "#{name}_latest_change"
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updated_at = Cache.read(key)
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return updated_at if updated_at
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# if we do not have it cached, do lookup
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updated_at = order(updated_at: :desc).limit(1).pick(:updated_at)
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return if !updated_at
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latest_change_set(updated_at)
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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 = "#{name}_latest_change"
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expires_in = 86_400 # 1 day
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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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