Is it possible to use pattern match on Plug.router

Questions / Help
,
1

Hey guys!

I’d like to know if it is possible to use pattern match on Plug.router to retrieve the params.

I’ve the following code:

post "/person" do
   %w{"name" => name} = conn.params
   send_resp(conn, 201, "")
end

I was trying to do something like this but it didn’t work:

post "/person", _,  %w{"name" => name} do
   send_resp(conn, 201, "")
end

Also, is this the correctly way to retrieve the params from request?

Thanks!!!

2

You can pattern match only on URLs and use guards but not on all params altogether. So this would work:

post "/person/:name" when byte_size(name) >= 3 do
  ...
end

Yours can’t be done in the route match. You will need case or another function for that.

2 Likes
3

Thanks Valim!

4

It was the full power of elixir pattern matching that led me to experiment creating an alternative to plug. Raxx would allow you to do the following.

def handle_request(%{method: "POST", path: ["person"], query: %{name: name}, _) do
  created("")
end

Maybe of interest but the project is definitely just an experiment.

3 Likes
5

Really cool project Peter!! Learn a lot digging into your code!

1 Like