fix tables unable to sort on nil dates

lib/cannery/comparable_date.ex

@@ -0,0 +1,12 @@
+defmodule Cannery.ComparableDate do
+  @moduledoc """
+  A custom `Date` module that provides a `compare/2` function that is comparable
+  with nil values
+  """
+
+  @spec compare(Date.t() | any(), Date.t() | any()) :: :lt | :gt | :eq
+  def compare(%Date{} = date_1, %Date{} = date_2), do: Date.compare(date_1, date_2)
+  def compare(%Date{}, _date_2), do: :lt
+  def compare(_date_1, %Date{}), do: :gt
+  def compare(_date_1, _date_2), do: :eq
+end

lib/cannery/comparable_datetime.ex

@@ -0,0 +1,15 @@
+defmodule Cannery.ComparableDateTime do
+  @moduledoc """
+  A custom `DateTime` module that provides a `compare/2` function that is
+  comparable with nil values
+  """
+
+  @spec compare(DateTime.t() | any(), DateTime.t() | any()) :: :lt | :gt | :eq
+  def compare(%DateTime{} = datetime_1, %DateTime{} = datetime_2) do
+    DateTime.compare(datetime_1, datetime_2)
+  end
+
+  def compare(%DateTime{}, _datetime_2), do: :lt
+  def compare(_datetime_1, %DateTime{}), do: :gt
+  def compare(_datetime_1, _datetime_2), do: :eq
+end

lib/cannery_web/components/ammo_group_table_component.ex

@@ -3,7 +3,8 @@ defmodule CanneryWeb.Components.AmmoGroupTableComponent do
   A component that displays a list of ammo groups
   """
   use CanneryWeb, :live_component
-  alias Cannery.{Accounts.User, ActivityLog, Ammo, Ammo.AmmoGroup, Containers}
+  alias Cannery.{Accounts.User, Ammo.AmmoGroup, ComparableDate}
+  alias Cannery.{ActivityLog, Ammo, Containers}
   alias Ecto.UUID
   alias Phoenix.LiveView.{Rendered, Socket}
 
@@ -54,8 +55,8 @@ defmodule CanneryWeb.Components.AmmoGroupTableComponent do
       end
 
     columns = [
-      %{label: gettext("Purchased on"), key: :purchased_on, type: Date},
-      %{label: gettext("Last used on"), key: :used_up_on, type: Date} | columns
+      %{label: gettext("Purchased on"), key: :purchased_on, type: ComparableDate},
+      %{label: gettext("Last used on"), key: :used_up_on, type: ComparableDate} | columns
     ]
 
     columns =

lib/cannery_web/components/shot_group_table_component.ex

@@ -3,7 +3,7 @@ defmodule CanneryWeb.Components.ShotGroupTableComponent do
   A component that displays a list of shot groups
   """
   use CanneryWeb, :live_component
-  alias Cannery.{Accounts.User, ActivityLog.ShotGroup, Ammo}
+  alias Cannery.{Accounts.User, ActivityLog.ShotGroup, Ammo, ComparableDate}
   alias Ecto.UUID
   alias Phoenix.LiveView.{Rendered, Socket}
 
@@ -41,7 +41,7 @@ defmodule CanneryWeb.Components.ShotGroupTableComponent do
       %{label: gettext("Ammo"), key: :name},
       %{label: gettext("Rounds shot"), key: :count},
       %{label: gettext("Notes"), key: :notes},
-      %{label: gettext("Date"), key: :date, type: Date},
+      %{label: gettext("Date"), key: :date, type: ComparableDate},
       %{label: nil, key: :actions, sortable: false}
     ]
 

lib/cannery_web/live/ammo_group_live/show.ex

@@ -6,7 +6,7 @@ defmodule CanneryWeb.AmmoGroupLive.Show do
   use CanneryWeb, :live_view
   alias Cannery.{ActivityLog, ActivityLog.ShotGroup}
   alias Cannery.{Ammo, Ammo.AmmoGroup}
-  alias Cannery.Containers
+  alias Cannery.{ComparableDate, Containers}
   alias CanneryWeb.Endpoint
   alias Phoenix.LiveView.Socket
 
@@ -90,7 +90,7 @@ defmodule CanneryWeb.AmmoGroupLive.Show do
     columns = [
       %{label: gettext("Rounds shot"), key: :count},
       %{label: gettext("Notes"), key: :notes},
-      %{label: gettext("Date"), key: :date, type: Date},
+      %{label: gettext("Date"), key: :date, type: ComparableDate},
       %{label: nil, key: :actions, sortable: false}
     ]