我如何查詢返回的列

我在ruby中創建了這個腳本來計算mfe mae。但它返回一個活動記錄，我不能查詢它的列。如果我做了puts["mini"]我得到我如何查詢返回的列

D:/TradingTools/torontotrader/app/helpers/rb1A5.tmp:28:in '[]': can't convert String into Integer (TypeError) 
    from D:/TradingTools/torontotrader/app/helpers/rb1A5.tmp:28 
    from D:/TradingTools/torontotrader/app/helpers/rb1A5.tmp:24:in `each' 
    from D:/TradingTools/torontotrader/app/helpers/rb1A5.tmp:24 
Complete(1)

我做了細節的輸出，這是一個TickData型的，我是被返回集合型的columsn的。我怎樣才能得到的值

class TickData < ActiveRecord::Base 
    set_table_name "tickdata" 
end 
class Trades < ActiveRecord::Base 
    set_table_name "trades" 
end 
class TradesReport < ActiveRecord::Base 
    set_table_name "tradesreport" 
end 

sql="select * from tradesreport where entry>=(select min(time) from tickdata) and exitt <=(select max(time) from tickdata)" 

tradestocalculate= Trades.find_by_sql(sql) 
tradestocalculate.each {|item| 
    sql="select MIN(LASTPRICE) as mini,MAX(LASTPRICE) as maxi,COUNT(*) as no from tickdata where time >='#{item['entry']}' AND time <= '#{item['exitt']}' and 
symbol like '%#{item['symbol_alias'][0,3]}%'" 
    details= TickData.find_by_sql(sql) 
    puts details["mini"]

來源

2012-02-25 junkone

我覺得你這樣做是錯誤的。活動記錄是一個orm不是一個sql庫。爲此你會使用續集 – three 2012-02-25 21:06:28

你的結果是details[0]['mini']，details[0]['maxi']和details[0]['no']

來源

2012-02-25 21:15:46 Baldrick

我如何查詢返回的列

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