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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class RemoveDuplicateMrEvents < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
class Event < ActiveRecord::Base
self.table_name = 'events'
end
def up
base_condition = "action = 1 AND target_type = 'MergeRequest' AND created_at > '2017-08-13'"
Event.select('target_id, count(*)')
.where(base_condition)
.group('target_id').having('count(*) > 1').each do |event|
duplicates = Event.where("#{base_condition} AND target_id = #{event.target_id}").pluck(:id)
duplicates.shift
Event.where(id: duplicates).delete_all
end
end
def down
end
end
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