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Many thanks to our reviewers, beta-readers, and Absinthe contributors!
benwilson512
Author of Craft GraphQL APIs in Elixir with Absinthe
andre1sk
simon
Is there an updated version of the code which accompanies the book anywhere?
Running the initial mix ecto.setup results in a load of deprecation warnings but fails with this:
== Compilation error in file lib/plate_slate_web/schema.ex ==
** (Absinthe.Schema.Error) Invalid schema:
Elixir.PlateSlateWeb.Schema:0: The root query type must be implemented and be a of type Object
I’m guessing that having installed Phoenix 1.4 isn’t going to help much either however.
Would it be simpler for me to recreate the initial project from an empty one and add in up-to-date deps and bear that in mind as I work through the book?
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benwilson512
Author of Craft GraphQL APIs in Elixir with Absinthe
What version of elixir are you on? Does your schema have a root query object? If so, upgrade Absinthe to the latest version.
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simon
Thanks Ben. I’m on Elixir 1.7.3.
I’m using the code from the PragProg site (in the 02-chp.schema/1-start folder).
I’ve just commented out the contents of the PlateSlateWeb.Schema module and then mix ecto.setup works and generates the database.
Simply uncommenting use Absinthe.Schema causes the error I mentioned earlier.
At the bottom of the error output is:
lib/absinthe/schema.ex:258: Absinthe.Schema.__after_compile__/2
(stdlib) lists.erl:1263: :lists.foldl/3
(stdlib) erl_eval.erl:680: :erl_eval.do_apply/6
(elixir) lib/kernel/parallel_compiler.ex:206: anonymous fn/4 in Kernel.ParallelCompiler.spawn_workers/6
I will have more of a dig into it later but I’ve started a new project and am slowly building it up using a combination of the book, your blog post (https://www.howtographql.com/graphql-elixir/0-introduction/) and the Absinthe documentation.
As I say, I’m pretty sure it’s an Elixir or Phoenix update issue because I did work through the first chapters of the book a while ago without this problem.
I’ll let you know if I get to the bottom of it.
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benwilson512
Author of Craft GraphQL APIs in Elixir with Absinthe
Yeah just upgrade Absinthe, Elixir 1.7 fixed a bug that Absinthe was apparently relying on during schema generation. We fixed it a while ago but the book code still ships with relatively older versions of Absinthe since, well, it’s hard to change print.
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simon
Thanks Ben, that did the trick (as long as I left everything else alone). There are still a lot of deprecation warnings but I completely understand about the book being published at a fixed point in time.
Fingers crossed that one day you and Bruce have the willpower to work on a revised edition. Now that I’ve started tinkering with it, GraphQL and Absinthe are fantastic. Thank you for all of your hard work, it’s very much appreciated, even by those of us who might not have time to contribute to the project (but maybe I will as I get more into using it).
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pillaiindu
This book mentions that we should use the following versions of technologies used,
• Erlang (v20.0+)
• Elixir (v1.5.0+)
• PostgreSQL (v9.4+)
But when I peeked into the code it says,
def project do
[
...
elixir: "~> 1.4",
...
end
which means that it’s using Elixir version 1.4 or above and 1.4 depends on Erlang v18/v19 (Erlang v20 from Elixir v1.4.5).
So what versions of Erlang and Elixir should I use?
A month or two months ago I tried to follow this book and failed because some versions issue, so this time I want to be sure that I’m using the correct versions.
@benwilson512
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benwilson512
Author of Craft GraphQL APIs in Elixir with Absinthe
@pillaiindu Use the versions mentioned in the book. The code was first generated in Elixir 1.4 and we simply forgot to update that one spot.
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pillaiindu
Should I change that line from elixir: "~> 1.4", to elixir: "~> 1.5" after copying the code?
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