class RuboCop::Cop::Style::ClassVars
Checks for uses of class variables. Offenses are signaled only on assignment to class variables to reduce the number of offenses that would be reported.
You have to be careful when setting a value for a class variable; if a class has been inherited, changing the value of a class variable also affects the inheriting classes. This means that it’s almost always better to use a class instance variable instead.
@example
# bad class A @@test = 10 end class A def self.test(name, value) class_variable_set("@@#{name}", value) end end class A; end A.class_variable_set(:@@test, 10) # good class A @test = 10 end class A def test @@test # you can access class variable without offense end end class A def self.test(name) class_variable_get("@@#{name}") # you can access without offense end end
Constants
- MSG
- RESTRICT_ON_SEND
Public Instance Methods
on_cvasgn(node)
click to toggle source
# File lib/rubocop/cop/style/class_vars.rb, line 52 def on_cvasgn(node) add_offense(node.loc.name, message: format(MSG, class_var: node.children.first)) end
on_send(node)
click to toggle source
# File lib/rubocop/cop/style/class_vars.rb, line 56 def on_send(node) add_offense( node.first_argument, message: format(MSG, class_var: node.first_argument.source) ) end