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Protect the latest event from automatic deletion when using MySQL

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This is a workaround for #1940.
This commit is contained in:
Akinori MUSHA 2017-04-19 19:25:14 +09:00
parent 37a70f62a7
commit cabc7156d1
1 changed files with 14 additions and 3 deletions
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17
app/models/event.rb
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@ -28,6 +28,15 @@ class Event < ActiveRecord::Base
where("expires_at IS NOT NULL AND expires_at < ?", Time.now)
}
case ActiveRecord::Base.connection
when ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter
# Protect the Event table from InnoDB's AUTO_INCREMENT Counter
# Initialization by always keeping the latest event.
scope :to_expire, -> { expired.where.not(id: maximum(:id)) }
else
scope :to_expire, -> { expired }
end
scope :with_location, -> {
where.not(lat: nil).where.not(lng: nil)
}
@ -72,9 +81,11 @@ class Event < ActiveRecord::Base
# Look for Events whose `expires_at` is present and in the past. Remove those events and then update affected Agents'
# `events_counts` cache columns. This method is called by bin/schedule.rb periodically.
def self.cleanup_expired!
affected_agents = Event.expired.group("agent_id").pluck(:agent_id)
Event.expired.delete_all
Agent.where(:id => affected_agents).update_all "events_count = (select count(*) from events where agent_id = agents.id)"
transaction do
affected_agents = Event.to_expire.group("agent_id").pluck(:agent_id)
Event.to_expire.delete_all
Agent.where(id: affected_agents).update_all "events_count = (select count(*) from events where agent_id = agents.id)"
end
end
protected