elixir - 如何转换 POST 正文响应以获取元素？

Question

我正在HTTPoisonElixir 中使用 Web 请求：

HTTPpoison.post "http://localhost:3000/mymodels"," {\"param1\": \"#{value1}\" ,  \"param2\":\"#{value2}\"} ", [{"Content-Type", "application/json"}] 

这是我得到的回应：

{:ok,
 %HTTPoison.Response{body: "{\"id\":46,\"result\":18,\"param1\":\"liqueur\",\"param2\":\"quif\"}",
  headers: [{"X-Frame-Options", "SAMEORIGIN"},
   {"X-XSS-Protection", "1; mode=block"}, {"X-Content-Type-Options", "nosniff"},
   {"Location", "http://localhost:3000/mymodels/46"},
   {"Content-Type", "application/json; charset=utf-8"},
   {"ETag", "W/\"05b8c75e0a5288c835651f48d4b8a80a\""},
   {"Cache-Control", "max-age=0, private, must-revalidate"},
   {"X-Request-Id", "1e8ae2d3-073a-4779-916a-edffc38f8b5a"},
   {"X-Runtime", "0.530440"}, {"Transfer-Encoding", "chunked"}],
  status_code: 201}}

我是 Elixir 的新手，我的问题是我想results从response.body

iex(3)> response.body           
"{\"id\":46,\"results\":18,\"param1\":\"liqueur\",\"param2\":\"quif\"}"

我不确定如何在 Elixir 中将此字符串转换为数组/散列或 stuple。我在 Enum 有，但它似乎不起作用

Answer 1

response.body是一个 JSON 编码的字符串。您需要先使用 JSON 解析器将其解析为适当的 Elixir 数据结构。使用Poison，您将使用Poison.decode!/1：

iex(1)> body = "{\"id\":46,\"results\":18,\"param1\":\"liqueur\",\"param2\":\"quif\"}"
"{\"id\":46,\"results\":18,\"param1\":\"liqueur\",\"param2\":\"quif\"}"
iex(2)> json = Poison.decode!(body)
%{"id" => 46, "param1" => "liqueur", "param2" => "quif", "results" => 18}
iex(3)> json["results"]
18