如果值存在,则显示哈希的内容

我有一个哈希:

req = {
  "count" => 50100,
  "results" => [
    {"listing_id" => 615929315, "state" => "active", "user_id" => 140604756, "category_id" => 69150367}, 
    {"listing_id" => 615929311, "state" => "active", "user_id" => 152528025, "category_id" => 69150367}
  ]
}

我想找到并显示整个内部哈希,如果 user_id 存在。我可以找到它:

req["results"][0].select{|key, value| value == 152528025}
# => {"user_id" => 152528025}

然后如何显示整个(嵌套)哈希?

{"listing_id" => 615929311, "state" => "active", "user_id" => 152528025, "category_id" => 69150367}