fix n+1 queries with invite card

lib/memex_web/components/core_components.ex

@@ -4,7 +4,7 @@ defmodule MemexWeb.CoreComponents do
   """
   use Phoenix.Component
   import MemexWeb.{Gettext, ViewHelpers}
-  alias Memex.{Accounts, Accounts.Invite, Accounts.Invites, Accounts.User}
+  alias Memex.{Accounts, Accounts.Invite, Accounts.User}
   alias Memex.Contexts.Context
   alias Memex.Notes.Note
   alias Memex.Pipelines.Steps.Step
@@ -77,64 +77,12 @@ defmodule MemexWeb.CoreComponents do
   def user_card(assigns)
 
   attr :invite, Invite, required: true
+  attr :use_count, :integer, default: nil
   attr :current_user, User, required: true
   slot(:inner_block)
   slot(:code_actions)
 
-  def invite_card(%{invite: invite, current_user: current_user} = assigns) do
-    assigns = assigns |> assign(:use_count, Invites.get_use_count(invite, current_user))
-
-    ~H"""
-    <div class="px-8 py-4 flex flex-col justify-center items-center space-y-4
-      bg-primary-900
-      border border-gray-400 rounded-lg shadow-lg hover:shadow-md
-      transition-all duration-300 ease-in-out">
-      <h1 class="title text-xl">
-        <%= @invite.name %>
-      </h1>
-
-      <%= if @invite.disabled_at |> is_nil() do %>
-        <h2 class="title text-md">
-          <%= if @invite.uses_left do %>
-            <%= gettext(
-              "uses left: %{uses_left_count}",
-              uses_left_count: @invite.uses_left
-            ) %>
-          <% else %>
-            <%= gettext("uses left: unlimited") %>
-          <% end %>
-        </h2>
-      <% else %>
-        <h2 class="title text-md">
-          <%= gettext("invite disabled") %>
-        </h2>
-      <% end %>
-
-      <.qr_code
-        content={Routes.user_registration_url(Endpoint, :new, invite: @invite.token)}
-        filename={@invite.name}
-      />
-
-      <h2 :if={@use_count != 0} class="title text-md">
-        <%= gettext("uses: %{uses_count}", uses_count: @use_count) %>
-      </h2>
-
-      <div class="flex flex-row flex-wrap justify-center items-center">
-        <code
-          id={"code-#{@invite.id}"}
-          class="mx-2 my-1 text-xs px-4 py-2 rounded-lg text-center break-all
-            text-primary-400 bg-primary-800"
-          phx-no-format
-        ><%= Routes.user_registration_url(Endpoint, :new, invite: @invite.token) %></code>
-        <%= if @code_actions, do: render_slot(@code_actions) %>
-      </div>
-
-      <div :if={@inner_block} class="flex space-x-4 justify-center items-center">
-        <%= render_slot(@inner_block) %>
-      </div>
-    </div>
-    """
-  end
+  def invite_card(assigns)
 
   attr :id, :string, required: true
   attr :datetime, :any, required: true, doc: "A `DateTime` struct or nil"

lib/memex_web/components/core_components/invite_card.html.heex

@@ -0,0 +1,48 @@
+<div class="px-8 py-4 flex flex-col justify-center items-center space-y-4
+  bg-primary-900
+  border border-gray-400 rounded-lg shadow-lg hover:shadow-md
+  transition-all duration-300 ease-in-out">
+  <h1 class="title text-xl">
+    <%= @invite.name %>
+  </h1>
+
+  <%= if @invite.disabled_at |> is_nil() do %>
+    <h2 class="title text-md">
+      <%= if @invite.uses_left do %>
+        <%= gettext(
+          "uses left: %{uses_left_count}",
+          uses_left_count: @invite.uses_left
+        ) %>
+      <% else %>
+        <%= gettext("uses left: unlimited") %>
+      <% end %>
+    </h2>
+  <% else %>
+    <h2 class="title text-md">
+      <%= gettext("invite disabled") %>
+    </h2>
+  <% end %>
+
+  <.qr_code
+    content={Routes.user_registration_url(Endpoint, :new, invite: @invite.token)}
+    filename={@invite.name}
+  />
+
+  <h2 :if={@use_count && @use_count != 0} class="title text-md">
+    <%= gettext("uses: %{uses_count}", uses_count: @use_count) %>
+  </h2>
+
+  <div class="flex flex-row flex-wrap justify-center items-center">
+    <code
+      id={"code-#{@invite.id}"}
+      class="mx-2 my-1 text-xs px-4 py-2 rounded-lg text-center break-all
+        text-primary-400 bg-primary-800"
+      phx-no-format
+    ><%= Routes.user_registration_url(Endpoint, :new, invite: @invite.token) %></code>
+    <%= if @code_actions, do: render_slot(@code_actions) %>
+  </div>
+
+  <div :if={@inner_block} class="flex space-x-4 justify-center items-center">
+    <%= render_slot(@inner_block) %>
+  </div>
+</div>

lib/memex_web/live/invite_live/index.ex

@@ -148,7 +148,9 @@ defmodule MemexWeb.InviteLive.Index do
       |> Map.get(:admin, [])
       |> Enum.reject(fn %{id: user_id} -> user_id == current_user.id end)
 
+    use_counts = invites |> Invites.get_use_counts(current_user)
     users = all_users |> Map.get(:user, [])
-    socket |> assign(invites: invites, admins: admins, users: users)
+
+    socket |> assign(invites: invites, use_counts: use_counts, admins: admins, users: users)
   end
 end

lib/memex_web/live/invite_live/index.html.heex

@@ -14,7 +14,12 @@
   <% end %>
 
   <div class="flex flex-col justify-center items-stretch space-y-4">
-    <.invite_card :for={invite <- @invites} invite={invite} current_user={@current_user}>
+    <.invite_card
+      :for={invite <- @invites}
+      invite={invite}
+      current_user={@current_user}
+      use_count={Map.get(@use_counts, invite.id)}
+    >
       <:code_actions>
         <form phx-submit="copy_to_clipboard">
           <button