Issue #21555 has been updated by byroot (Jean Boussier).
This feature is only supported for attr_reader and attr, not attr_writer or attr_accessor, since setter methods cannot have question marks.
Using the same logic, `attr_accessor :enabled?` could generate `#enabled?` and `#enabled=` without problem. `attr_writer :enabled?` would be weird though. ---------------------------------------- Feature #21555: Add support for predicate attribute reader names https://bugs.ruby-lang.org/issues/21555#change-114435 * Author: shan (Shannon Skipper) * Status: Open ---------------------------------------- After manually aliasing predicate methods many times, I wanted to propose letting `attr_reader` take predicate method names that correspond to instance variables of the base name without a trailing question mark. https://github.com/ruby/ruby/pull/14391 If the base name method doesn't already exist, a predicate name defines a base name method attribute reader to alias then undefines the base name. For example, this creates an `enabled?` method that reads `@enabled`: ```ruby attr_reader :enabled? ``` This feature is only supported for `attr_reader` and `attr`, not `attr_writer` or `attr_accessor`, since setter methods cannot have question marks. Example: ```ruby class Example attr_reader :valid?, :meaning def initialize @valid = [true, false].sample @meaning = 42 end end Example.new.valid? #=> true ``` -- https://bugs.ruby-lang.org/