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This fixes #5329, which occurred when using MigrationHelpers on a table that Postgres estimated to be non-empty when it was actually empty.signup-info-prompt
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@ -335,7 +335,10 @@ module Mastodon
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start_arel = table.project(table[:id]).order(table[:id].asc).take(1)
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start_arel = table.project(table[:id]).order(table[:id].asc).take(1)
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start_arel = yield table, start_arel if block_given?
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start_arel = yield table, start_arel if block_given?
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start_id = exec_query(start_arel.to_sql).to_hash.first['id'].to_i
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first_row = exec_query(start_arel.to_sql).to_hash.first
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# In case there are no rows but we didn't catch it in the estimated size:
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return unless first_row
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start_id = first_row['id'].to_i
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say "Migrating #{table_name}.#{column} (~#{total.to_i} rows)"
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say "Migrating #{table_name}.#{column} (~#{total.to_i} rows)"
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