How to use Elixir

[WLPhoenix]

http://gogogarrett.sexy/programming-in-elixir-with-the-phoenix-framework-building-a-basic-CRUD-app/

[jbunting]

Here's how I do a post request:

 13     body = "code=#{code}&grant_type=authorization_code&client_secret=CDRPVW63YBXLHSPGL4Q25AFJKTXC7EYWOJ6LOQEE3UDIOABT6N&client_id=7EBFEB24BRVOV6J5KG"
 14     case HTTPoison.post("https://www.eventbrite.com/oauth/token", body, [{<<"Content-Type">>, <<"application/x-www-form-urlencoded">>}]) do
 15       {:ok, %HTTPoison.Response{status_code: 200, body: body}} ->
 16         IO.puts "BODY :: [[#{body}]]"
 17       {:ok, %HTTPoison.Response{status_code: 404, body: body}} ->
 18         IO.puts "Not found :-( #{body}"
 19       {:ok, %HTTPoison.Response{status_code: status_code, body: body}} ->
 20         IO.puts "I got a different code #{status_code} -- what the hell? #{body}"
 21       {:error, %HTTPoison.Error{reason: reason}} ->
 22         IO.inspect reason
 23     end

[jbunting]

Added a new route like this:

  9     get "/auth", CodeForConduct.PageController, :auth, as: :pages

[jbunting]

When I want different handling based on query params, I can do it like this:

  # when there is a "code" query param
  def auth(conn, %{"code" => code}) do
    ...
  end
  # otherwise
  def auth(conn, _params) do
    ...
  end

Both of these are the same method, and they pattern match on the incoming parameters to select which body to execute.

[jbunting]

How to do a redirect from a controller function:

 29     redirect conn, "https://www.eventbrite.com/oauth/authorize?response_type=code&client_id=7EBFEB24BRVOV6J5KG"

[WLPhoenix]

# Where body is a map
case Poison.encode body do                                            
  {:ok, json} -> HTTPoison.post('http://localhost:3300', json) 
  {:error, r} -> IO.puts r
end

[WLPhoenix]

# How to get environment variable, and default if not found
[port: System.get_env("PORT") || 4000]

[jbunting]

ERLANG NOT HAVE MUTABLE STATE.

To be more specific:

put_session(conn, "key", "value")

is NOT the same as:

conn = put_session(conn, "key", "value")

Use the second one, otherwise you just threw away your session value.