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

instance method

OpenStruct#set_ostruct_member_value!

set_ostruct_member_value!(name, value)

Alias of #[]=

Sets the value of an attribute.

Example
require "ostruct"
person = OpenStruct.new("name" => "John Smith", "age" => 70)
person[:age] = 42   # equivalent to person.age = 42
person.age          # => 42
See also #[]= #inspect #to_h #freeze also in 3.4 · 3.3 · 3.2 · 3.1