trabajo-afectivo/db/migrate/20201006131231_stats_store_polymorphic_association.rb

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# Copyright (C) 2012-2021 Zammad Foundation, http://zammad-foundation.org/
class StatsStorePolymorphicAssociation < ActiveRecord::Migration[5.2]
def change
return if !Setting.exists?(name: 'system_init_done')
# create ObjectLookup ID -> Model map
object_lookup_map = ObjectLookup.all.pluck(:id, :name)
# create empty, indexed polymorphic association columns
add_reference :stats_stores, :stats_storable, polymorphic: true, index: true
# set last run 20 min in future to avoid scheduler errors until restart
Scheduler.find_by(method: 'Stats.generate').update(last_run: 20.minutes.from_now)
# migrate column data in the most performance way
object_lookup_map.each do |id, model|
StatsStore.where(stats_store_object_id: id)
.update_all("stats_storable_id = o_id, stats_storable_type = '#{model}'") # rubocop:disable Rails/SkipsModelValidations
end
remove_unneeded_columns
end
private
def remove_unneeded_columns
# remove home made "polymorphic association" columns
remove_column :stats_stores, :o_id
remove_column :stats_stores, :stats_store_object_id
# remove unused/obsolete columns
remove_column :stats_stores, :related_stats_store_object_id
remove_column(:stats_stores, :related_o_id) if StatsStore.column_names.include?('related_o_id')
end
end