Create module variables in Ruby
Ruby natively supports class variables in modules, so you can use class variables directly, and not some proxy or pseudo-class-variables:
module Site
@@name = "StackOverflow"
def self.setName(value)
@@name = value
end
def self.name
@@name
end
end
Site.name # => "StackOverflow"
Site.setName("Test")
Site.name # => "Test"
you can set a class instance variable in the module.
module MyModule
class << self; attr_accessor :var; end
end
MyModule.var = 'this is saved at @var'
MyModule.var
=> "this is saved at @var"
If you do not need to call it from within an instance, you can simply use an instance variable within the module body.
module SomeModule
module_function
def param; @param end
def param= v; @param = v end
end
SomeModule.param
# => nil
SomeModule.param = 1
SomeModule.param
# => 1
The instance variable @param
will then belong to the module SomeModule
, which is an instance of the Module
class.