ruby冒泡算法删除店铺下的重复评论

Shop.each do |shop|
    if !shop.comments.blank?
    n = shop.comments.length
    for i in 0..n-1
        for j in i+1..n-1
            if shop.comments[i].content == shop.comments[j].content
                shop.comments[j].destroy
            end 
        end
    end
    end
end     

以上为ruby冒泡算法删除店铺下的重复评论代码