End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Module#attr_accessor

attr_accessor(symbol, ...) → array

attr_accessor(string, ...) → array

static VALUE
rb_mod_attr_accessor(int argc, VALUE *argv, VALUE klass)
{
    int i;
    VALUE names = rb_ary_new2(argc * 2);

    for (i=0; i<argc; i++) {
        ID id = id_for_attr(klass, argv[i]);

        rb_attr(klass, id, TRUE, TRUE, TRUE);
        rb_ary_push(names, ID2SYM(id));
        rb_ary_push(names, ID2SYM(rb_id_attrset(id)));
    }
    return names;
}

Defines a named attribute for this module, where the name is symbol.id2name, creating an instance variable (@name) and a corresponding access method to read it. Also creates a method called name= to set the attribute. String arguments are converted to symbols. Returns an array of defined method names as symbols.

Example

module Mod
  attr_accessor(:one, :two) #=> [:one, :one=, :two, :two=]
end
Mod.instance_methods.sort   #=> [:one, :one=, :two, :two=]

Ruby version changes

3.0
- Module#attr_accessor, Module#attr_reader, Module#attr_writer and Module#attr methods now return an array of defined method names as symbols. [Feature #17314]

See also #attr #attr_reader #append_features #attr_writer also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1

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