Programming Elixir ≥ 1.6

Transformation: Convert Response

We’ll need a JSON library to convert the response into a data structure. Searching hex.pm, I found the poison library (no relation to HTTPoison), so let’s add its dependency to our mix.exs file.^[23]

project/2/issues/mix.exs

defp deps do
  [
    { :httpoison, "~> 1.0.0" },
    { :poison,    "~> 3.1"    },
  ]
end

Run mix deps.get, and you’ll end up with poison installed.

To convert the body from a string, we call the Poison.Parser.parse! function when we return the message from the GitHub API:

project/3/issues/lib/issues/github_issues.ex

def handle_response({ _, %{status_code: status_code, body: body}}) do
  {
    status_code |> check_for_error(),
    body        |> Poison.Parser.parse!()
  }
end