如果我在Ruby on Rails中有一个哈希值，有没有办法让它无关紧要？

Question

如果我已经有哈希，我可以这样做吗

h[:foo]
h['foo']

是一样的吗？ （这被称为无关紧要的访问吗？）

详细信息：我在initializers中使用以下内容加载此哈希值，但可能不会产生任何影响：

SETTINGS = YAML.load_file("#{RAILS_ROOT}/config/settings.yml")

Answer 1

您可以使用with_indifferent_access。

SETTINGS = YAML.load_file("#{RAILS_ROOT}/config/settings.yml").with_indifferent_access

Answer 2

如果你已经有哈希，你可以这样做：

HashWithIndifferentAccess.new({'a' => 12})[:a]

Answer 3

你也可以这样编写YAML文件：

--- !map:HashWithIndifferentAccess
one: 1
two: 2

之后：

SETTINGS = YAML.load_file("path/to/yaml_file")
SETTINGS[:one] # => 1
SETTINGS['one'] # => 1

Answer 4

使用HashWithIndifferentAccess代替普通哈希。

为完整起见，请写：

SETTINGS = HashWithIndifferentAccess.new(YAML.load_file("#{RAILS_ROOT}/config/settings.yml"­))

Answer 5

You can just make a new hash of HashWithIndifferentAccess type from your hash.

hash = { "one" => 1, "two" => 2, "three" => 3 }
=> {"one"=>1, "two"=>2, "three"=>3}

hash[:one]
=> nil 
hash['one']
=> 1 


make Hash obj to obj of HashWithIndifferentAccess Class.

hash =  HashWithIndifferentAccess.new(hash)
hash[:one]
 => 1 
hash['one']
 => 1