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实际上，我有来自 MrJoshi 的搜索查询，这是相关的问题： Search query for (name or forename) and (name forname) and (forname name)

def self.search(query)
  return where('FALSE') if query.blank?

  conditions = []
  search_columns = [ :forname, :name ]

  query.split(' ').each do |word|
    search_columns.each do |column|
      conditions << " lower(#{column}) LIKE lower(#{sanitize("%#{word}%")}) "
    end
  end

  conditions = conditions.join('OR')    
  self.where(conditions)
end

这个搜索查询的问题在于它返回的记录很多。例如，如果有人正在搜索John Smith此搜索查询返回所有记录forename John和所有记录name Smith虽然只有一个人与搜索查询完全匹配name is Smith and forename is John 所以我稍微更改了代码：

def self.search(query)
  return where('FALSE') if query.blank?

  conditions = []

  query2 = query.split(' ')

  if query2.length == 2
      conditions << " lower(:forname) AND lower(:name) LIKE ?', lower(#{sanitize("%#{query2.first}%")}) , lower(#{sanitize("%#{query2.last}%")})"
      conditions << " lower(:forname) AND lower(:name) LIKE ?', lower(#{sanitize("%#{query2.last}%")}) , lower(#{sanitize("%#{query2.first}%")})"
  else
    search_columns = [ :forname, :name ]
       query2.each do |word|
        search_columns.each do |column|
         conditions << " lower(#{column}) LIKE lower(#{sanitize("%#{word}%")}) "
        end
       end
  end

  conditions = conditions.join('OR')    
  self.where(conditions)
end

但现在我得到这个错误：

SQLite3::SQLException: near "', lower('": syntax error: SELECT  "patients".* FROM "patients"  WHERE ( lower(:forname) AND lower(:name) LIKE ?', lower('%John%') , lower('%Smith%')OR lower(:forname) AND lower(:name) LIKE ?', lower('%Smith%') , lower('%John%')) LIMIT 12 OFFSET 0

我做错了什么？谢谢！

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