Consider the following Ruby code:
module MyModule
class << self
def process_item(item)
item.capitalize
end
def foo=(item)
@foo_ref=process_item(item)
end
def foo
@foo_ref
end
self.foo = "initial foo"
end
end
I want to set a default foo_ref variable inside the singleton class definition. However, the Ruby interpreter raises the following error:
singleton class': undefined method `foo=' for #(NoMethodError)
If I change self.foo = "Initial foo" to foo = "Initial foo" then I am creating a local variable within the singleton class, instead of calling the setter method.
Also, I do realize that I may have to put the process_item method in the module definition, outside the singleton class definition, so that it does not become a singleton method, but rather a helper method.
What would be the proper approach to this code (being able to call a singleton method within the singleton class definition, and having helper methods available within the singleton class definition)?
You can define the default value as:
module MyModule
class << self
def process_item(item)
item.capitalize
end
def foo=(item)
@foo_ref=process_item(item)
end
def foo
@foo_ref ||= "initial foo"
end
end
end
What you were trying to do was to set foo to the singleton class, instead of setting foo to the class.
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments