add a simple leaderboard

app/controllers/leaderboard_controller.rb

@@ -0,0 +1,17 @@
+class LeaderboardController < ApplicationController
+  skip_before_action :authenticate_user!, only: %i[index]
+
+  def index
+    @filter = params[:filter] || "all_time"
+    @ranked_speakers = Speaker.left_joins(:talks)
+      .group(:id)
+      .order("COUNT(talks.id) DESC")
+      .select("speakers.*, COUNT(talks.id) as talk_count")
+
+    if @filter == "last_12_months"
+      @ranked_speakers = @ranked_speakers.where("talks.date >= ?", 12.months.ago.to_date)
+    end
+
+    @ranked_speakers = @ranked_speakers.limit(100)
+  end
+end

app/views/leaderboard/index.html.erb

@@ -0,0 +1,41 @@
+<div class="container mx-auto px-4 py-8">
+  <h1 class="text-3xl font-bold mb-6">Speaker Leaderboard</h1>
+
+  <div class="mb-6">
+    <%= link_to "All Time", leaderboard_path(filter: "all_time"), class: "btn btn-sm #{(@filter == "all_time") ? "btn-primary" : "btn-outline"} mr-2" %>
+    <%= link_to "Last 12 Months", leaderboard_path(filter: "last_12_months"), class: "btn btn-sm #{(@filter == "last_12_months") ? "btn-primary" : "btn-outline"}" %>
+  </div>
+
+  <div class="overflow-x-auto">
+    <table class="table w-full table-pin-rows">
+      <thead>
+        <tr>
+          <th class="text-left">Rank</th>
+          <th class="text-left">Name</th>
+          <th class="text-left">Talks</th>
+        </tr>
+      </thead>
+      <tbody>
+        <% @ranked_speakers.each_with_index do |speaker, index| %>
+          <tr>
+            <td class="font-bold"><%= index + 1 %></td>
+            <td>
+              <%= link_to speaker_path(speaker), class: "link link-hover" do %>
+                <div class="flex items-center gap-4">
+                  <% if speaker.github.present? %>
+                    <%= image_tag speaker.github_avatar_url(size: 128), class: "rounded-full w-10 h-10", alt: "GitHub picture profile of #{speaker.name}", loading: :lazy %>
+                  <% else %>
+                    <div class="rounded-full w-10 h-10 bg-gray-200"></div>
+                  <% end %>
+
+                  <%= speaker.name %>
+                </div>
+              <% end %>
+            </td>
+            <td><%= speaker.talk_count %></td>
+          </tr>
+        <% end %>
+      </tbody>
+    </table>
+  </div>
+</div>

app/views/shared/_navbar.html.erb

@@ -8,6 +8,7 @@
         <%= render "shared/navbar/link", link_title: "Talks", path: talks_path %>
         <%= render "shared/navbar/link", link_title: "Speakers", path: speakers_path %>
         <%= render "shared/navbar/link", link_title: "Events", path: events_path %>
+        <%= render "shared/navbar/link", link_title: "Leaderboard", path: leaderboard_path %>
         <% signed_in do %>
           <%= render "shared/navbar/link", link_title: "Watch List", path: watch_lists_path %>
           <% if Current.user&.admin? %>

config/routes.rb

@@ -54,6 +54,8 @@
     resources :enhance, only: [:update], param: :slug
   end
 
+  get "leaderboard", to: "leaderboard#index"
+
   # admin
   namespace :admin, if: -> { Current.user & admin? } do
     resources :suggestions, only: %i[index update destroy]