Umm... maybe don't show all users ☠️

app/controllers/admin/users_controller.rb

@@ -2,7 +2,18 @@ class Admin::UsersController < Admin::BaseController
   before_action :set_user, except: :index
 
   def index
-    @pagy, @users = pagy User.all.order(created_at: :desc)
+    @email_address = params[:email_address]
+
+    if (user = User.find_by_email_address @email_address)
+      redirect_to admin_user_path(user)
+    else
+      flash.now[:notice] = "User not found."
+
+      respond_to do |format|
+        format.turbo_stream { render turbo_stream: turbo_stream.replace("flash", partial: "shared/flash") }
+
+        format.html { render :edit, status: :unprocessable_entity }
+      end
   end
 
   def show
@@ -12,7 +23,7 @@ def update
     if @user.update(user_params)
       redirect_to admin_user_path(@user)
     else
-      flash.now[:notice] = @user.errors.full_messages.to_sentence
+      flash.now[:notice] = @user.errors.full_messages.first
 
       respond_to do |format|
         format.turbo_stream { render turbo_stream: turbo_stream.replace("flash", partial: "shared/flash") }

app/views/admin/users/index.html.erb

@@ -2,6 +2,8 @@
 <% @nav_active_item = admin_users_path %>
 <h1 class="title">Users</h1>
 
-<%= render partial: "snippet", collection: @users, as: :user %>
-
-<%== pagy_nav(@pagy) %>
+<%= form_with method: :get, class: "simple_form mt2" do |form| %> 
+  <div style="display: flex"> 
+    <%= form.email_field :email_address, placeholder: "Email address", value: @email_address, style: "flex: 1" %>
+  </div>
+<% end %>

test/system/admin/users_test.rb

@@ -7,12 +7,14 @@ class Admin::UsersTest < ApplicationSystemTestCase
     @user = User.first
   end
 
-  test "listing users" do
+  test "searching for a user" do
     visit admin_users_path
 
-    User.all.each do |user|
-      assert_text user.email_address
-    end
+    fill_in :email_address, with: "[email protected]\n"
+    assert_text /not found/i
+
+    fill_in :email_address, with: "#{@user.email_address}\n"
+    assert_redirected_to admin_user_path(@user)
   end
 
   test "editing a user's name" do