Ruby, class attribute with limited range

I have been working with Ruby for three days. I am trying to set a default in the way shown below, for #happiness. i need #happiness to have a range of 0-10, cannot be less than zero or more than ten. Thanks in advance.

class Person
    attr_reader :name
    attr_accessor :bank_account, :happiness={value > 11}
    
    def initialize(name)
        @name = name
        @bank_account = 25
        @happiness = 8
    end
end

If you need a writer method that performs some validation, then you have to write a writer method which performs that validation. For example, something like this:

class Person
  attr_reader :name, :happiness
  attr_accessor :bank_account

  def initialize(name)
    @name = name
    @bank_account = 25
    @happiness = 8
  end

  def happiness=(value)
    raise ArgumentError, "`happiness` needs to be between 0 and 10, but you supplied `#{value}`" unless 0..10 === value
    @happiness = value
  end
end