How to fix Callback info about the 'Elixir.Ecto.Repo' behaviour is not available

Questions / Help
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1

Hi, I have an error in my project that says fix Callback info about the 'Elixir.Ecto.Repo' behaviour is not available in my Repo file.

Screenshot 2020-04-01 at 12.25.02 pm
Screenshot 2020-04-01 at 12.25.02 pm1010×324 30.5 KB

I couldn’t find anything to fix it in Ecto doc
https://hexdocs.pm/ecto/Ecto.Repo.html

and I saw this post:

Thanks

2

If you run dialyzer manually does the error occur as well?

If yes, can you please show relevant sections of your mix.exs?

1 Like
3

Hi, I haven’t installed dialyzer yet in my project, I just see this problem in Vscode

do I install this and test ?

my mix file without dialyzer:

defmodule AuthService.MixProject do
  use Mix.Project

  def project do
    [
      app: :auth_service,
      version: "0.1.0",
      build_path: "../../_build",
      config_path: "../../config/config.exs",
      deps_path: "../../deps",
      lockfile: "../../mix.lock",
      elixir: "~> 1.10.2",
      start_permanent: Mix.env() == :prod,
      deps: deps()
    ]
  end

  # Run "mix help compile.app" to learn about applications.
  def application do
    [
      extra_applications: [:logger],
      mod: {AuthService.Application, []}
    ]
  end

  # Run "mix help deps" to learn about dependencies.
  defp deps do
    [
      {:ecto, "~> 3.3"},
      {:ecto_sql, "~> 3.3"},
      {:postgrex, "~> 0.15.3"},
      {:guardian, "~> 2.0"},
      {:oauth2, "~> 2.0", override: true},
      {:ueberauth, "~> 0.6.2"},
      {:ueberauth_google, "~> 0.9.0"},
      {:ueberauth_github, "~> 0.8.0"},
      {:jose, "~> 1.10"},
      {:comeonin, "~> 5.2"},
      {:bcrypt_elixir, "~> 2.1"}
      # {:sibling_app_in_umbrella, in_umbrella: true}
    ]
  end
end
4

Yes, add it as a dependency (only: :dev). Then run mix dialyzer.

If you see errors in your editor, always try to reproduce them on the terminal as well. Sometimes editors get a somewhat weird view on your project that is not in a consistent state.

Also, is this an umbrella? I think I remember there have been problems in umbrellas with some features of the LS.

1 Like
5

yes it is, I installed it in my main mix.exs file and ran mix dialyzer

it shows me errors

lib/phoenix/router.ex:2:no_return
Function call/2 has no local return.
________________________________________________________________________________
lib/phoenix/router.ex:2:no_return
Function call/2 has no local return.
________________________________________________________________________________
lib/phoenix/router.ex:331:pattern_match_cov
The pattern
variable_

can never match, because previous clauses completely cover the type
:error.

________________________________________________________________________________
lib/phoenix/router.ex:331:pattern_match_cov
The pattern
variable_

can never match, because previous clauses completely cover the type
:error.

________________________________________________________________________________
done (warnings were emitted)
Halting VM with exit status 2

That file has no error but my router lib file has errors :frowning:

I searched this error, and they suggested to skip this error

6

Depending on your exact versions used, you might hit some bug in the phoenix router…

Maybe related list of dialyzer/router issues

1 Like
7

all of the Phoenix projects under of my umbrella project are phoenix 1.4.16

8

Is lib/phoenix/router.ex your file? Or from phoenix? Feels weird to see warnings from dependencies…

9

I’d also consider using the dialyxir project, it seems to handle things like umbrella projects better in my experience.

1 Like
10

I think it is phoenix file because I don’t have 331 lines in my project, :frowning:

11