ruby-on-rails - 检查哈希是否包含任何空值

Question

我有以下散列，我正在寻找一种简单的方法来检查散列中的所有内容是否为空。并非所有值都始终在散列中可见，因此有时散列没有 end_date/start_date 或其他任何内容。

test
=> {"0"=>
  {"_destroy"=>"",
   "START_DATE"=>"",
   "END_DATE"=>"",
   "EMPLOYER"=>"",
   "JOB_TITEL"=>"",
   "FUNCTIONAL_AREA"=>"",
   "INDUSTRY"=>"",
   "DESCRIPTION_TXT"=>"",
   "COUNTRY"=>"",
   "CITY"=>"",
   "REGION"=>"",
   "CONTRACT_TYPE"=>""},
 "1"=>
  {"_destroy"=>"",
   "START_DATE"=>"",
   "END_DATE"=>"",
   "EMPLOYER"=>"",
   "JOB_TITEL"=>"",
   "FUNCTIONAL_AREA"=>"",
   "INDUSTRY"=>"",
   "DESCRIPTION_TXT"=>"",
   "COUNTRY"=>"",
   "CITY"=>"",
   "REGION"=>"",
   "CONTRACT_TYPE"=>""},
 "2"=>
  {"_destroy"=>"",
   "START_DATE"=>"",
   "END_DATE"=>"",
   "EMPLOYER"=>"",
   "JOB_TITEL"=>"",
   "FUNCTIONAL_AREA"=>"",
   "INDUSTRY"=>"",
   "DESCRIPTION_TXT"=>"",
   "COUNTRY"=>"",
   "CITY"=>"",
   "REGION"=>"",
   "CONTRACT_TYPE"=>""}}

在伪代码中它会像这样

Start loop
-> check if current position contains an empties 
=> if all is empty delete position
-> continue
end loop

在这个例子中，这意味着哈希在循环结束时将为空。

亲切的问候

Answer 1

使用Hash#delete_if :

test.delete_if { |i,h| h.all? { |k,v| v.empty? } }