feat: sort header for members list

lib/mv_web/live/member_live/index.ex

@@ -5,18 +5,18 @@ defmodule MvWeb.MemberLive.Index do
   import MvWeb.TableComponents
 
   @impl true
-  def mount(_params, _session, socket) do
-    members = Ash.read!(Mv.Membership.Member)
-    sorted = Enum.sort_by(members, & &1.first_name)
-
-    {:ok,
-     socket
-     |> assign(:page_title, gettext("Members"))
+  def mount(params, _session, socket) do
+    socket =
+      socket
+      |> assign(:page_title, gettext("Members"))
      |> assign(:query, "")
-     |> assign(:sort_field, :first_name)
-     |> assign(:sort_order, :asc)
-     |> assign(:members, sorted)
-     |> assign(:selected_members, [])}
+      |> assign_new(:sort_field, fn -> :first_name end)
+      |> assign_new(:sort_order, fn -> :asc end)
+      |> assign(:selected_members, [])
+
+    # We call handle params to use the query from the URL
+    {:noreply, socket} = handle_params(params, nil, socket)
+    {:ok, socket}
   end
 
   # -----------------------------------------------------------------
@@ -45,6 +45,11 @@ defmodule MvWeb.MemberLive.Index do
   # Handle Events
   # -----------------------------------------------------------------
 
+  # -----------------------------------------------------------------
+  # Handle Events
+  # -----------------------------------------------------------------
+
+  # Delete a member
   @impl true
   def handle_event("delete", %{"id" => id}, socket) do
     member = Ash.get!(Mv.Membership.Member, id)
@@ -67,32 +72,7 @@ defmodule MvWeb.MemberLive.Index do
     {:noreply, assign(socket, :selected_members, selected)}
   end
 
-  # Sorts the list of members according to a field, when you click on the column header
-  @impl true
-  def handle_event("sort", %{"field" => field_str}, socket) do
-    members = socket.assigns.members
-    field = String.to_existing_atom(field_str)
-
-    new_order =
-      if socket.assigns.sort_field == field do
-        toggle_order(socket.assigns.sort_order)
-      else
-        :asc
-      end
-
-    sorted_members =
-      members
-      |> Enum.sort_by(&Map.get(&1, field), sort_fun(new_order))
-
-    {:noreply,
-     socket
-     |> assign(:sort_field, field)
-     |> assign(:sort_order, new_order)
-     |> assign(:members, sorted_members)}
-  end
-
-  #     Selects all members in the list of members
-
+  #  Selects all members in the list of members
   @impl true
   def handle_event("select_all", _params, socket) do
     members = socket.assigns.members
@@ -109,8 +89,123 @@ defmodule MvWeb.MemberLive.Index do
     {:noreply, assign(socket, :selected_members, selected)}
   end
 
+  # -----------------------------------------------------------------
+  # Handle Infos from Child Components
+  # -----------------------------------------------------------------
+
+  # Sorts the list of members according to a field, when you click on the column header
+  @impl true
+  def handle_info({:sort, field_str}, socket) do
+    field = String.to_existing_atom(field_str)
+
+    {new_order, new_field} =
+      if socket.assigns.sort_field == field do
+        {toggle_order(socket.assigns.sort_order), field}
+      else
+        {:asc, field}
+      end
+
+    active_id = :"sort_#{new_field}"
+
+    # Update the SortHeader to
+    send_update(MvWeb.Components.SortHeaderComponent,
+      id: active_id,
+      sort_field: new_field,
+      sort_order: new_order
+    )
+
+    # Build the URL with queries
+    query_params = %{
+      "sort_field" => Atom.to_string(new_field),
+      "sort_order" => Atom.to_string(new_order)
+    }
+
+    # "/members" is the path you defined in router.ex
+    new_path = "/members?" <> URI.encode_query(query_params)
+
+    # Push the new URL
+    {:noreply,
+     push_patch(socket,
+       to: new_path,
+       # replace true
+       replace: true
+     )}
+  end
+
+  # -----------------------------------------------------------------
+  # Handle Params from the URL
+  # -----------------------------------------------------------------
+  @impl true
+  def handle_params(params, _url, socket) do
+    socket =
+      socket
+      |> maybe_update_sort(params)
+      |> load_members()
+
+    {:noreply, socket}
+  end
+
+  # -------------------------------------------------------------
+  # FUNCTIONS
+  # -------------------------------------------------------------
+  # Load members eg based on a query for sorting
+  defp load_members(socket) do
+    query =
+      Mv.Membership.Member
+      |> Ash.Query.new()
+      |> Ash.Query.select([
+        :id,
+        :first_name,
+        :last_name,
+        :email,
+        :street,
+        :house_number,
+        :postal_code,
+        :city,
+        :phone_number,
+        :join_date
+      ])
+      |> maybe_sort(socket.assigns.sort_field, socket.assigns.sort_order)
+
+    members = Ash.read!(query)
+    assign(socket, :members, members)
+  end
+
+  defp maybe_update_sort(socket, %{"sort_field" => sf, "sort_order" => so}) do
+    field =
+      try do
+        String.to_existing_atom(sf)
+      rescue
+        ArgumentError -> socket.assigns.sort_field
+      end
+
+    order = if so in ["asc", "desc"], do: String.to_atom(so), else: socket.assigns.sort_order
+
+    IO.inspect(order)
+
+    socket
+    |> assign(:sort_field, field)
+    |> assign(:sort_order, order)
+  end
+
+  # -------------------------------------------------------------
+  # Helper Functions
+  # -------------------------------------------------------------
+
+  # Functions to toggle sorting order
   defp toggle_order(:asc), do: :desc
   defp toggle_order(:desc), do: :asc
-  defp sort_fun(:asc), do: &<=/2
-  defp sort_fun(:desc), do: &>=/2
+  defp toggle_order(nil), do: :asc
+
+  # Function to turn a string into an atom only if it already exists
+  defp maybe_atom(nil), do: nil
+  defp maybe_atom(atom) when is_atom(atom), do: atom
+  defp maybe_atom(str) when is_binary(str), do: String.to_existing_atom(str)
+
+  # Function to sort the column if needed
+  defp maybe_sort(query, nil, _), do: query
+  defp maybe_sort(query, field, :asc), do: Ash.Query.sort(query, [{field, :asc}])
+  defp maybe_sort(query, field, :desc), do: Ash.Query.sort(query, [{field, :desc}])
+  # no changes
+  defp maybe_update_sort(socket, _), do: socket
 end