Split GraphQL as separate context

lib/graphql/helpers/error.ex

@@ -0,0 +1,25 @@
+defmodule Mobilizon.GraphQL.Helpers.Error do
+  @moduledoc """
+  Helper functions for Mobilizon.GraphQL
+  """
+
+  def handle_errors(fun) do
+    fn source, args, info ->
+      case Absinthe.Resolution.call(fun, source, args, info) do
+        {:error, %Ecto.Changeset{} = changeset} -> format_changeset(changeset)
+        val -> val
+      end
+    end
+  end
+
+  def format_changeset(changeset) do
+    # {:error, [email: {"has already been taken", []}]}
+    errors =
+      changeset.errors
+      |> Enum.map(fn {key, {value, _context}} ->
+        [message: "#{value}", details: key]
+      end)
+
+    {:error, errors}
+  end
+end