如果将“＃{keyword}”替换为“？”，则可以执行以下操作。使用问号将自动清除sql。
keywords = input.split(/\s+/)
queries = []
vars = []
keywords.each do |keyword|
queries << "(classifications.species LIKE '%?%' OR
classifications.family LIKE '%?%' OR
classifications.trivial_names LIKE '%?%' OR
place LIKE '%?%')"
vars = vars << keyword << keyword << keyword << keyword
end
options[:conditions] = [queries.join(' AND '), vars].flatten
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