Elixir 1.7.4, Absinthe compilation error: The root query type must be implemented and be a of type Object

Hanums

I am receiving below error at mix compile. I tried to downgrade but received error on Mac. Help please…

$ brew switch elixir 1.6.6
Error: elixir does not have a version "1.6.6" in the Cellar.
elixir installed versions: 1.7.4

I am at Elixir 1.7.4 and deps are

      {:absinthe, "~> 1.4.0"},
      {:absinthe_plug, "~> 1.4.0"},
      {:absinthe_ecto, "~> 0.1.3"},

The root query type must be implemented and be a of type Object

  #Example
  defmodule MyApp.Schema do
    use Absinthe.Schema

    query do
      #Fields go here
    end
  end

From the graqhql schema specifiation

A GraphQL schema includes types, indicating where query and mutation
operations start. This provides the initial entry points into the type system.
The query type must always be provided, and is an Object base type. The
mutation type is optional; if it is null, that means the system does not
support mutations. If it is provided, it must be an object base type.

Reference: https://facebook.github.io/graphql/#sec-Initial-types

lib/absinthe/schema.ex:271: 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

23 comments

/phoenix #graphql #absinthe

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2019-01-29 20:35:42 UTC

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Eiji

Please take a look at this post:

Post #1

Hanums

Thank you for quick response. I am new to Elixir world and not used to the terminology yet.

Do you mean Elixir V1.7.0-rc.0 release fixed Absinthe compilation bug? My Elixir is 1.7.4 and believe higher version than V1.7.0-rc.0.

Confused now, appreciate more info.

Post #2

Eiji

@Hanums Looks like that absinthe is not yet ready for Elixir > 1.6.6. Try installing 1.6.6 version of Elixir and let us know if that solves your problem.

If I remember that topic well absinthe used some Elixir private API which have been changed. Also absinthe probably had planned big rework, but I’m not following it and I’m not sure if it’s done now.

If you want to give a try with 1.7.4 then you would need to try special git branch for new version of Elixir. Please see Git options ( :git ) documentation page which describes how to use such options properly.

Post #3

kokolegorille

I have been using Absinthe 1.4 with Elixir > 1.7

Here is my dependencies (Do not use 1.4.0, prefer 1.4)

      {:ecto, "~> 3.0", override: true},
      #
      {:absinthe, "~> 1.4"},
      {:absinthe_plug, "~> 1.4"},
      {:absinthe_ecto, "~> 0.1.3"},
      {:absinthe_relay, "~> 1.4"},
      {:absinthe_phoenix, "~> 1.4"},

I am overriding ecto because absinthe_relay requires ecto 2, but that is not required if You don’t use relay.

At least You need one query inside the query block. For example, You can try this…

  query do
    field :hello, :string do
      resolve fn _, _ -> {:ok, "world!"} end
    end
  end

In graphiql, You can query

{
  hello
}

And this would be the result.

{
  "data": {
    "hello": "world!"
  }
}

Do not forget to specify the json encoder in your router…

  scope "/" do
    pipe_through :api

    # Note: downloaded from CDN!
    forward "/graphiql",
      Absinthe.Plug.GraphiQL,
      schema: GraphqlWeb.Schema,
      json_codec: Jason
  end

Post #4

benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

Absinthe absolutely supports Elixir 1.7. However, you need one of the latest versions. @Hanums you should mix deps.update absinthe.

Post #5

Eiji

My bad - this question just reminded me this old issue and I just checked if 1.7-issue branch is still there and it is. I had just took a look at branches details and found:

1.7-issue Updated 6 months ago by benwilson512

Post #6

Hanums

Thank you Benwilson512 and code compiled successfully, but Error Absinthe.Schema.Error still persists. Now I am in the process of testing GraphQL and will post updates.

Post #7

benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

If you do mix deps|grep absinthe what version do you show?

Post #8

Hanums

warning: found quoted keyword “test” but the quotes are not required. Note that keywords are always atoms, even when quoted, and quotes should only be used to introduce keywords with foreign characters in them
mix.exs:76

absinthe 1.4.13 (Hex package) (mix)
locked at 1.4.13 (absinthe) 81eb2ff4
absinthe_plug 1.4.5 (Hex package) (mix)
locked at 1.4.5 (absinthe_plug) f63d52a7
absinthe_ecto 0.1.3 (Hex package) (mix)
locked at 0.1.3 (absinthe_ecto) 420b6812

Post #9