如果我在 Ruby on Rails 中有一个哈希值，有没有办法让它无差别访问？
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If I have a hash in Ruby on Rails, is there a way to make it indifferent access?
提问by Sarah W
If I already have a hash, can I make it so that
如果我已经有一个散列，我可以这样做吗
h[:foo]
h['foo']
are the same? (is this called indifferent access?)
是相同的？（这叫冷漠访问吗？）
The details: I loaded this hash using the following in initializersbut probably shouldn't make a difference:
详细信息：我使用以下内容加载了这个哈希，initializers但可能不会有什么不同：
SETTINGS = YAML.load_file("#{RAILS_ROOT}/config/settings.yml")
回答by Austin Taylor
You can just use with_indifferent_access.
你可以只使用with_indifferent_access.
SETTINGS = YAML.load_file("#{RAILS_ROOT}/config/settings.yml").with_indifferent_access
回答by moritz
If you have a hash already, you can do:
如果你已经有一个哈希，你可以这样做：
HashWithIndifferentAccess.new({'a' => 12})[:a]
回答by Psylone
You can also write the YAML file that way:
您也可以这样编写 YAML 文件：
--- !map:HashWithIndifferentAccess
one: 1
two: 2
after that:
在那之后：
SETTINGS = YAML.load_file("path/to/yaml_file")
SETTINGS[:one] # => 1
SETTINGS['one'] # => 1
回答by nathanvda
Use HashWithIndifferentAccessinstead of normal Hash.
使用HashWithIndifferentAccess而不是普通的 Hash。
For completeness, write:
为了完整起见，写：
SETTINGS = HashWithIndifferentAccess.new(YAML.load_file("#{RAILS_ROOT}/config/settings.yml"-))
回答by TheVinspro
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
