I am getting a dialyzer error about unmatched returns of which I'm not sure how to properly address.
mix dialyzer --quiet
lib/my_app_web/router.ex:1:no_return
Function __checks__/0 has no local return.
________________________________________________________________________________
lib/my_app_web/router.ex:21:unmatched_return
The expression produces a value of type:
%{
:adapter => _,
:before_send => _,
:content_type => _,
:context => _,
:document_providers => _,
:json_codec => _,
:log_level => _,
:no_query_message => _,
:pipeline => _,
:pubsub => _,
:raw_options => Keyword.t(),
:schema_mod => atom(),
:serializer => _
}
but this value is unmatched.
________________________________________________________________________________
lib/my_app_web/router.ex:24:unmatched_return
The expression produces a value of type:
%{
:adapter => _,
:additional_pipeline => _,
:assets => _,
:before_send => _,
:content_type => _,
:context => _,
:default_headers => _,
:default_url => _,
:document_providers => _,
:interface => _,
:json_codec => _,
:log_level => _,
:no_query_message => _,
:pipeline => {Absinthe.Plug.GraphiQL, :pipeline},
:pubsub => _,
:raw_options => [{_, _}],
:schema_mod => atom(),
:serializer => _,
:socket => _,
:socket_url => _
}
but this value is unmatched.
My mix.exs looks like this:
def project do
[
app: :my_app,
version: "0.1.0",
elixir: "1.9.4",
elixirc_paths: elixirc_paths(Mix.env()),
compilers: [:phoenix, :gettext] ++ Mix.compilers(),
start_permanent: Mix.env() == :prod,
dialyzer: [
plt_add_deps: :transitive,
flags: [:error_handling, :race_conditions, :unmatched_returns, :underspecs]
],
aliases: aliases(),
deps: deps()
]
end
my router.ex looks like this:
defmodule MyAppWeb.Router do
use MyAppWeb, :router
pipeline :browser do
plug :accepts, ["html"]
plug :fetch_session
plug :fetch_flash
plug :protect_from_forgery
plug :put_secure_browser_headers
plug MyAppWeb.Auth
end
pipeline :api do
plug :accepts, ["json"]
end
# Other scopes may use custom stacks.
scope "/api" do
pipe_through :api
forward "/graphql", Absinthe.Plug, schema: MyAppWeb.Schema.UserTypes
if Mix.env() == :dev do
forward "/graphiql", Absinthe.Plug.GraphiQL,
schema: MyAppWeb.Schema.UserTypes,
interface: :simple
end
end
scope "/", MyAppWeb do
pipe_through :browser
resources "/users", UserController,
only: [:index, :show, :new, :create, :edit, :delete, :update]
resources "/sessions", SessionController, only: [:new, :create, :delete]
get "/", PageController, :index, as: :home
get "/*path", PageController, :index
end
end
I have tried the _ = trick but it doesn't seem to work. I think using unmatched returns could be helpful but perhaps not in this case. I have read this page (https://github.com/jeremyjh/dialyxir/wiki/Phoenix-Dialyxir-Quickstart) but I don't think it helped fix this issue.
Any feedback or direction would be greatly appreciated.
Thank you
