本页内容：https://rubymonk.com/learning/books/4-ruby-primer-ascent/chapters/45-more-classes/lessons/105-equality_of_objects
我正试图纠正这段代码，使它通过测试。我的尝试相当糟糕，因为我才刚刚开始学习软件逻辑是如何工作的。

class Item
    attr_reader :item_name, :qty

    def initialize(item_name, qty)
        @item_name = item_name
        @qty = qty
    end
    def to_s
        "Item (#{@item_name}, #{@qty})"
    end

    def ==(other_item)
    end
end

p Item.new("abcd",1)  == Item.new("abcd",1)
p Item.new("abcd",2)  == Item.new("abcd",1)

这是我的解决方案，但它是不正确的：

class Item
    attr_reader :item_name, :qty

    def initialize(item_name, qty)
        @item_name = item_name
        @qty = qty
    end
    def to_s
        "Item (#{@item_name}, #{@qty})"
    end

    def ==(other_item)
       if self == other_item
         return true
       else
         return false
       end
    end
end

p Item.new("abcd",1)  == Item.new("abcd",1)
p Item.new("abcd",2)  == Item.new("abcd",1)

我希望有一个RubyMaven能帮我解决这个问题。我不知道如何解决它。
谢谢你的帮忙
下面是测试的输出：

STDOUT:
nil
nil
Items with same item name and quantity should be equal
RSpec::Expectations::ExpectationNotMetError
expected Item (abcd, 1) got Item (abcd, 1) (compared using ==) Diff:
Items with same item name but different quantity should not be equal ✔
Items with same same quantity but different item name should not be equal ✔