比較使用套散列值的兩個數組在紅寶石

Question

在此之後SO我想比較散列值的兩個數組：

db = [ 
{:foo => "bar", :stack => "overflow", :num => 0.5}, 
{:foo => "bar", :stack => "underlow", :num => 0.5}, 
{:foo => "bar", :stack => "overflow", :num => 0.1} 
] 

csv = [ 
{:foo => "bar", :stack => "overflow", :num => 0.5}, 
{:foo => "bar", :stack => "underlow", :num => 0.1}, 
] 

我試圖用一個紅寶石套裝（db_set = Set[db]，csv_set = Set[csv]）使用比較兩個（db_set - csv_set）和&（db_set & csv_set），但這些似乎沒有執行比較操作。

我誤解了Set的使用嗎？我如何比較這兩個哈希數組？

Answer 1

這裏不需要使用套件。似乎你對Array操作符會很好。

db = [ 
    {:foo => "bar", :stack => "overflow", :num => 0.5}, 
    {:foo => "bar", :stack => "underlow", :num => 0.5}, 
    {:foo => "bar", :stack => "overflow", :num => 0.1} 
] 

csv = [ 
    {:foo => "bar", :stack => "overflow", :num => 0.5}, 
    {:foo => "bar", :stack => "underlow", :num => 0.1}, 
] 

db - csv # => [{:foo=>"bar", :stack=>"underlow", :num=>0.5}, {:foo=>"bar", :stack=>"overflow", :num=>0.1}] 
db & csv # => [{:foo=>"bar", :stack=>"overflow", :num=>0.5}]