比较使用套散列值的两个数组在红宝石

Question

在此之后SO我想比较散列值的两个数组：

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}, 
] 

我试图用一个红宝石套装（db_set = Set[db]，csv_set = Set[csv]）使用比较两个（db_set - csv_set）和&（db_set & csv_set），但这些似乎没有执行比较操作。

我误解了Set的使用吗？我如何比较这两个哈希数组？

Answer 1

这里不需要使用套件。似乎你对Array操作符会很好。

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}]