Add module to get the supplies by expiration date

lib/inmana/supplies/get_by_expiration.ex

@@ -0,0 +1,20 @@
+defmodule Inmana.Supplies.GetByExpiration do
+    import Ecto.Query
+
+    alias Inmana.{Repo, Restaurant, Supply}
+
+    def call do
+        today = Date.utc_today()
+        beginning_of_week = Date.beginning_of_week(today, :sunday)
+        end_of_week = Date.end_of_week(today, :sunday)
+
+        query = from supply in Supply,
+            where:
+                supply.expiration_date >= ^beginning_of_week and supply.expiration_date <= ^end_of_week,
+            preload: [:restaurant]
+
+        query
+        |> Repo.all()
+        |> Enum.group_by(fn %Supply{restaurant: %Restaurant{email: email}} -> email end)
+    end
+end