基于Ruby中postgresql的SELECT查询获取嵌套良好且分组良好的哈希

我有一个来自Postgresql的SELECT查询，返回如下结果：

 brand | model| firmware | direction | mbps 
-------+------+----------+-----------+------
 Cisco | 7602 | 7.2      | up        | 283
 Cisco | 7602 | 7.3      | up        | 192
 Cisco | 7602 | 7.2      | down      | 200  
 Cisco | 7602 | 7.3      | down      | 107 
 Cisco | 7602 | 7.2      | bi        | 249  
 Cisco | 7602 | 7.3      | bi        | 151  

{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.2", "direction"=>"up", "mbps"=>"283"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.3", "direction"=>"up", "mbps"=>"192"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.2", "direction"=>"down", "mbps"=>"200"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.3", "direction"=>"down", "mbps"=>"107"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.2", "direction"=>"bi", "mbps"=>"249"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.3", "direction"=>"bi", "mbps"=>"151"}

我希望得到一个嵌套良好的散列结果，将品牌、型号、固件分组，然后显示每个方向的mbps值。 我想展示嵌套散列的示例，但我现在有点不知所措，甚至不知道如何正确构造它

当前，我从运行该查询中得到的哈希如下所示：

 brand | model| firmware | direction | mbps 
-------+------+----------+-----------+------
 Cisco | 7602 | 7.2      | up        | 283
 Cisco | 7602 | 7.3      | up        | 192
 Cisco | 7602 | 7.2      | down      | 200  
 Cisco | 7602 | 7.3      | down      | 107 
 Cisco | 7602 | 7.2      | bi        | 249  
 Cisco | 7602 | 7.3      | bi        | 151  

{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.2", "direction"=>"up", "mbps"=>"283"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.3", "direction"=>"up", "mbps"=>"192"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.2", "direction"=>"down", "mbps"=>"200"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.3", "direction"=>"down", "mbps"=>"107"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.2", "direction"=>"bi", "mbps"=>"249"}
{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.3", "direction"=>"bi", "mbps"=>"151"}

---

我希望我的问题有意义。

你可以像这样建立分组

rows = [{"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.2", "direction"=>"up", "mbps"=>"283"},
        {"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.3", "direction"=>"up", "mbps"=>"192"},
        {"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.2", "direction"=>"down", "mbps"=>"200"},
        {"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.3", "direction"=>"down", "mbps"=>"107"},
        {"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.2", "direction"=>"bi", "mbps"=>"249"},
        {"brand"=>"Cisco", "model"=>"7602", "firmware"=>"7.3", "direction"=>"bi", "mbps"=>"151"}]
data = {}
rows.each do |row|
  data[row['brand']] ||= {}
  data[row['brand']][row['model']] ||= {}
  data[row['brand']][row['model']][row['firmware']] ||= {} 
  data[row['brand']][row['model']][row['firmware']][row['direction']] = row['mbps']
end

puts data

产出：

{"Cisco"=>{"7602"=>{"7.2"=>{"up"=>"283", "down"=>"200", "bi"=>"249"}, "7.3"=>{"up"=>"192", "down"=>"107", "bi"=>"151"}}}}

---

哇，天才们在stackoverflow中游荡，非常感谢，这正是我想要的！你需要展示你是如何向Postgres发出请求的。看起来您是从命令行执行的，而不是使用驱动程序，或者最好是类似ORM的驱动程序。使用Sequel可以很容易地以散列的形式获取数据，因为散列是用于表示行的自然对象。