28 lines
1.1 KiB
Ruby
28 lines
1.1 KiB
Ruby
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class StatsStorePolymorphicAssociation < ActiveRecord::Migration[5.2]
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def change
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return if !Setting.exists?(name: 'system_init_done')
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# create ObjectLookup ID -> Model map
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object_lookup_map = ObjectLookup.all.pluck(:id, :name)
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# create empty, indexed polymorphic association columns
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add_reference :stats_stores, :stats_storable, polymorphic: true, index: true
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# migrate column data in the most performance way
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object_lookup_map.each do |id, model|
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StatsStore.where(stats_store_object_id: id)
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.update_all("stats_storable_id = o_id, stats_storable_type = '#{model}'") # rubocop:disable Rails/SkipsModelValidations
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end
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# rubocop:disable Rails/ReversibleMigration
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# remove home made "polymorphic association" columns
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remove_column :stats_stores, :o_id
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remove_column :stats_stores, :stats_store_object_id
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# remove unused/obsolete columns
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remove_column :stats_stores, :related_stats_store_object_id
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remove_column(:stats_stores, :related_o_id) if StatsStore.column_names.include?('related_o_id')
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# rubocop:enable Rails/ReversibleMigration
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end
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end
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