类变量生命周期的红宝石

Question

I have a class variable named fields which is initiated like this:

@@fields ||= JSON.parse(@client.run_request(@request_path, 'get', params))["data"]

after the first time the method is called, in another rails request, @@fields still holds the

When does this value expire?

Answer 1

class variables do not expire, you can always access them through the class, instance variables can be accessed as long as the object lives, have a read here

http://thoughts.codegram.com/understanding-class-instance-variables-in-ruby/