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Fix Postgres UPDATE ... LIMIT bug #169

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Fix Postgres UPDATE ... LIMIT bug #169

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2 changes: 1 addition & 1 deletion lib/delayed/backend/active_record.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -126,7 +126,7 @@ def self.reserve_with_scope_using_optimized_postgres(ready_scope, worker, now)
# use 'FOR UPDATE' and we would have many locking conflicts
quoted_name = connection.quote_table_name(table_name)
subquery = ready_scope.limit(1).lock(true).select("id").to_sql
sql = "UPDATE #{quoted_name} SET locked_at = ?, locked_by = ? WHERE id IN (#{subquery}) RETURNING *"
sql = "UPDATE #{quoted_name} SET locked_at = ?, locked_by = ? WHERE id = (#{subquery}) RETURNING *"
reserved = find_by_sql([sql, now, worker.name])
reserved[0]
end
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