58 lines
2 KiB
Ruby
58 lines
2 KiB
Ruby
# frozen_string_literal: true
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class CopyAccountStats < ActiveRecord::Migration[5.2]
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disable_ddl_transaction!
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class MigrationAccount < ApplicationRecord
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self.table_name = :accounts
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end
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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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MigrationAccount.unscoped.select('id').find_in_batches(batch_size: 5_000) do |accounts|
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execute <<-SQL.squish
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INSERT INTO account_stats (account_id, statuses_count, following_count, followers_count, created_at, updated_at)
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SELECT id, statuses_count, following_count, followers_count, created_at, updated_at
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FROM accounts
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WHERE id IN (#{accounts.map(&:id).join(', ')})
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ON CONFLICT (account_id) DO UPDATE
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SET statuses_count = EXCLUDED.statuses_count, following_count = EXCLUDED.following_count, followers_count = EXCLUDED.followers_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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MigrationAccount.unscoped.select('id, statuses_count, following_count, followers_count, created_at, updated_at').find_each do |account|
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params = [account.id, account[:statuses_count], account[:following_count], account[:followers_count], account.created_at, account.updated_at]
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exec_insert('INSERT INTO account_stats (account_id, statuses_count, following_count, followers_count, created_at, updated_at) VALUES ($1, $2, $3, $4, $5, $6)', 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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