52 lines
1.7 KiB
Ruby
52 lines
1.7 KiB
Ruby
class CopyStatusStats < ActiveRecord::Migration[5.2]
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disable_ddl_transaction!
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def up
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safety_assured do
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if supports_upsert?
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up_fast
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else
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up_slow
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end
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end
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end
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def down
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# Nothing
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end
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private
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def supports_upsert?
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version = select_one("SELECT current_setting('server_version_num') AS v")['v'].to_i
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version >= 90_500
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end
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def up_fast
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say 'Upsert is available, importing counters using the fast method'
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Status.unscoped.select('id').find_in_batches(batch_size: 5_000) do |statuses|
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execute <<-SQL.squish
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INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at)
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SELECT id, reblogs_count, favourites_count, created_at, updated_at
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FROM statuses
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WHERE id IN (#{statuses.map(&:id).join(', ')})
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ON CONFLICT (status_id) DO UPDATE
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SET reblogs_count = EXCLUDED.reblogs_count, favourites_count = EXCLUDED.favourites_count
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SQL
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end
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end
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def up_slow
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say 'Upsert is not available in PostgreSQL below 9.5, falling back to slow import of counters'
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# We cannot use bulk INSERT or overarching transactions here because of possible
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# uniqueness violations that we need to skip over
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Status.unscoped.select('id, reblogs_count, favourites_count, created_at, updated_at').find_each do |status|
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params = [[nil, status.id], [nil, status.reblogs_count], [nil, status.favourites_count], [nil, status.created_at], [nil, status.updated_at]]
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exec_insert('INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at) VALUES ($1, $2, $3, $4, $5)', nil, params)
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rescue ActiveRecord::RecordNotUnique
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next
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end
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end
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end
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