how to return random sampling of data from hash

Question

I've parsed a json file (which consists of a single array called "items" containing 4 key-value pairs) into an OpenStruct so that I can treat my data as if they were objects. I would now like to display each object at random on a web page.

# read json file and parse into OpenStruct
def read_json(url)
    json_file = File.read(url)
    json_obj = JSON.parse(json_file, object_class: OpenStruct)
    return json_obj
end

# sample array
def random_display(json)
    out = json.items.sample
    return out
end

My json is basically like:

{
    "items": [
        {
            "foo": "bar",
            "foo": "bar"
        },
        {
            "foo": "bar",
            "foo": "bar"
        },
}

And then finally in my Sinatra routes, I've got:

get '/' do
  @data = read_json("public/data.json")
  @random = random_display(@data)
  erb :index
end

In my erb page I'm using <%= @random %> and getting a simple # as the result. Why? I mean, I'm aware that it's because I'm not telling it to show the value of any one particular key. But how do I work around that?

Another thing - I feel like the way I'm going about what I'm trying to do (which is create a little game that asks you to pick the more expensive of two random options) - is fundamentally wrong.