It won’t make any difference. That line is only used to validate that you’re running the project in at least Elixir 1.4, it doesn’t choose the elixir version.
benwilson512
Author of Craft GraphQL APIs in Elixir with Absinthe
pillaiindu
benwilson512
Author of Craft GraphQL APIs in Elixir with Absinthe
idi527
So what versions of Erlang and Elixir should I use?
I’ve reread the book recently and worked through the examples with elixir 1.8.1 and latest absinthe, dataloader, phoenix, ecto, etc. Don’t remember encountering any major problems, so I’d say the latest versions of everything should work.
2
benwilson512
Author of Craft GraphQL APIs in Elixir with Absinthe
This is also correct. The main thing that has tripped people up in the past is that they have tried to use the latest Elixir / Erlang without upgrading Absinthe. This leads to compilation errors. If however you upgrade Absinthe and other dependencies, it should all be smooth sailing.
5
kokolegorille
sb8244
Author of Real-Time Phoenix
slouchpie
Has anyone found a nice way of doing the challenge at the end of chapter 7 (Resolution Middleware)?
I’ve been trying to do it today and I’m getting nowhere. I think I don’t understand where the time taken is meant to be stored? Should it be on the response?
JFYI the challenge is to “Build some middleware that can be used to measure how long it takes to resolve a field”.
I know I’m showing lack of effort here but I can only do Elixir in my spare time (Python/JS dev by day) so any guidance or hints would be greatly appreciated.
0
slouchpie
To answer my own question, today I started chapter 9 and it does exactly this thing with a “bookended” middleware using :start and :finish calls. So anyone else doing this, keep reading and all will become clear.
To elaborate, I just expanded the Debug middleware from chapter 9 like this:
defmodule PlateSlateWeb.Schema.Middleware.Debug do
@behaviour Absinthe.Middleware
def call(resolution, :start) do
path = resolution |> Absinthe.Resolution.path |> Enum.join(".")
time1 = :erlang.timestamp
IO.puts """
========START==========
started: #{path}
with source: #{inspect resolution.source}
"""
%{resolution | middleware: resolution.middleware ++ [{__MODULE__, {:finish, path, time1}}]}
end
def call(resolution, {:finish, path, time1}) do
time2 = :erlang.timestamp
time_taken = :timer.now_diff(time2, time1)
IO.puts """
completed: #{path}
time taken: #{time_taken} microseconds (#{:erlang.float_to_binary(time_taken * 1.0e-6, [{:decimals, 6}])} seconds )
value: #{inspect resolution.value}
========END==========\
"""
resolution
end
end
It’s probably not the best solution but it works for me!
1
dustin
It’s 2024 and it appears that the downloadable code resources are out of date. I just bought the book a few days ago. I get a number of warnings, and the a compilation failure in lib/plate_slate_web/views/layout_view.ex.
Is there a version I might be missing, or any intention on updating the code?
1