ruby - 如何从 ruby​​ 中的数组中选择一个随机项（不是 rails）

Question

我有一系列国家：

@countries = ["Canada", "Denmark", "Germany", "Isle of Man", "Namibia", "Qatar", "South Africa",  "United Kingdom","United States"]

并且正在构建一些随机数据进行测试，如下所示：

@test = [{ :name   => "AAA -"+Faker::Name.name,  :country => @countries.???? ....}]

如何从@countries哈希中获取随机值？

@countries.rand(mlen)

不起作用并返回NoMethodError: private methodrand' 要求 #`。

Answer 1

使用Array#sample：

@countries = ["Canada", "Denmark", "Germany", "Isle of Man", "Namibia", "Qatar", "South Africa",  "United Kingdom","United States"]

random_country = @countries.sample
# => "Canada"

random_country = @countries.sample
# => "United Kingdom"

Answer 2

你也可以使用random_country = @countries.shuffle.first.