紅寶石：測試多維散列

Question

背景

我有我要執行檢查，以確保查找找到了匹配的多維散列，但它似乎並沒有工作一樣單一維度哈希值。我的代碼適用於找到匹配的情況，但不適用於不匹配。我讀過帖子，在某些情況下，哈希會自動生成一個不匹配的密鑰，我認爲這會導致NIL，因爲我沒有專門設置一個值。該錯誤消息我得到一個不匹配的情況是：

can't convert Hash into String (TypeError) 

鏈接到我的項目背景：代碼和超鏈接https://github.com/elvisimprsntr/siriproxy-redeye

摘錄來源：

redeyeconfig.rb

# Channel number and command syntax to actual RedEye device commandIds 
# Note: Must all be lower case. Use multiple entries for variability in Siri response. 
@cmdId = Hash.new(&(p=lambda{|h,k| h[k] = Hash.new(&p)})) 
@cmdId["all"]["cable box"]["0"]   = "/commands/send?commandId=3" 
@cmdId["all"]["cable box"]["zero"]  = "/commands/send?commandId=3" 
@cmdId["all"]["cable box"]["1"]   = "/commands/send?commandId=4" 

siriproxy-redeye.rb

def send_command(command) 
    commandid = @cmdId[@reRoom][@reDevice][command.downcase.strip] 
    unless commandid.nil? 
     say "OK. Sending command #{command}." 
# FIXIT: Does not properly handle no match. Results in "can't convert Hash into String (TypeError)" 
# This may be due to the fact that dynamically created multidimensional hash will create new keys if a match is not found which will pass the NIL check. 
     Rest.get(@reIp[@reSel] + @roomId[@reRoom] + @deviceId[@reRoom][@reDevice] + commandid) 
    else 
     say "Sorry, I am not programmed for command #{command}." 
    end 
    request_completed 
    end 

問題

如何定義/不同和/或測試初始化​​我的哈希值不匹配？

Answer 1

如果查找失敗，則不會得到nil或String - 而是獲得空的Hash。

檢查commandid.is_a?(Hash)和commandid.empty?是否知道查找失敗。