让我们有这个哈希:
hash = {"a" => 1, "b" => {"c" => 3}}
hash.get_all_keys
=> ["a", "b", "c"]
我怎么能得到所有的钥匙,因为hash.keys返回["a", "b"]
如何在同一个键中添加多个值？像这样的东西:
x = {}
x["k1"] = nil
x["k1"] << {"a" => "a"}
x["k1"] << {"b" => "b"}
好吧,这不像数组一样工作.
我尝试显示图像,但日志中的响应代码为404:
0:0:0:0:0:0:0:1 - - [02/Nov/2013 11:23:55] "GET /public/images/gtk_refresh.png HTTP/1.1" 404 466 0.0030
0:0:0:0:0:0:0:1 - - [02/Nov/2013:11:23:55 MEZ] "GET /public/images/gtk_refresh.png HTTP/1.1" 404 466
http://localhost:4567/main-> /public/images/gtk_refresh.png
rb文件:
get '/main' do
erb: main
end
erb文件:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1
/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<title>hello world</title>
</head>
<body>
<img src="public/images/gtk_refresh.png" />
</body>
</html>
我尝试了相对和绝对的图像路径,它不起作用.