switch to pagy for pagination

Gemfile

@@ -47,6 +47,9 @@ gem "thruster", require: false
 # Use Active Storage variants [https://guides.rubyonrails.org/active_storage_overview.html#transforming-images]
 gem "image_processing", "~> 1.2"
 
+# Pagination [https://github.com/ddnexus/pagy]
+gem "pagy", "~> 8.0"
+
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri windows ], require: "debug/prelude"

Gemfile.lock

@@ -232,6 +232,7 @@ GEM
     nokogiri (1.19.0-x86_64-linux-gnu)
       racc (~> 1.4)
     ostruct (0.6.3)
+    pagy (8.6.3)
     parallel (1.27.0)
     parser (3.3.10.1)
       ast (~> 2.4.1)
@@ -430,6 +431,7 @@ DEPENDENCIES
   importmap-rails
   jbuilder
   kamal
+  pagy (~> 8.0)
   propshaft
   puma (>= 5.0)
   rails (~> 8.1.2)
@@ -531,6 +533,7 @@ CHECKSUMS
   nio4r (2.7.5) sha256=6c90168e48fb5f8e768419c93abb94ba2b892a1d0602cb06eef16d8b7df1dca1
   nokogiri (1.19.0-x86_64-linux-gnu) sha256=f482b95c713d60031d48c44ce14562f8d2ce31e3a9e8dd0ccb131e9e5a68b58c
   ostruct (0.6.3) sha256=95a2ed4a4bd1d190784e666b47b2d3f078e4a9efda2fccf18f84ddc6538ed912
+  pagy (8.6.3) sha256=537b2ee3119f237dd6c4a0d0a35c67a77b9d91ebb9d4f85e31407c2686774fb2
   parallel (1.27.0) sha256=4ac151e1806b755fb4e2dc2332cbf0e54f2e24ba821ff2d3dcf86bf6dc4ae130
   parser (3.3.10.1) sha256=06f6a725d2cd91e5e7f2b7c32ba143631e1f7c8ae2fb918fc4cebec187e6a688
   pp (0.6.3) sha256=2951d514450b93ccfeb1df7d021cae0da16e0a7f95ee1e2273719669d0ab9df6

app/controllers/application_controller.rb

@@ -1,5 +1,6 @@
 class ApplicationController < ActionController::Base
   include BotBlocker
+  include Pagy::Backend
 
   # Changes to the importmap will invalidate the etag for HTML responses
   stale_when_importmap_changes

app/controllers/entries_controller.rb

@@ -6,8 +6,6 @@ class EntriesController < ApplicationController
     @category = params[:category].presence
     @query = params[:q].to_s.strip
     @starts_with = params[:starts_with].presence
-    @page = [ params[:page].to_i, 1 ].max
-    @per_page = 25
 
     entries_scope = Entry.active_entries
     entries_scope = entries_scope.with_category(@category)
@@ -16,9 +14,8 @@ class EntriesController < ApplicationController
     entries_scope = entries_scope.alphabetical_for(@language_code) if @query.blank? && @starts_with.blank? && @language_code.present?
     entries_scope = entries_scope.order(created_at: :desc) if entries_scope.order_values.empty?
 
-    @total_entries = entries_scope.count
-    @total_pages = (@total_entries.to_f / @per_page).ceil
-    @entries = entries_scope.offset((@page - 1) * @per_page).limit(@per_page)
+    @pagy, @entries = pagy(entries_scope, items: 25)
+    @total_entries = @pagy.count
 
     @entry_count = Entry.active_entries.count
     @requested_count = Entry.requested.count

app/helpers/application_helper.rb

@@ -1,4 +1,6 @@
 module ApplicationHelper
+  include Pagy::Frontend
+
   def language_name(code)
     supported_languages.find { |l| l.code == code }&.name
   end

app/views/entries/_results.html.erb

@@ -86,17 +86,19 @@
     </div>
 
     <div class="flex items-center justify-between mt-4 text-sm text-slate-600">
-      <div>Page <%= @page %> of <%= [@total_pages, 1].max %></div>
+      <div><%= pagy_info(@pagy) %></div>
       <div class="flex items-center gap-2">
-        <% previous_page = @page > 1 ? @page - 1 : nil %>
-        <% next_page = @page < @total_pages ? @page + 1 : nil %>
-        <% pagination_params = { q: @query.presence, category: @category.presence, language: @language_code.presence, starts_with: @starts_with.presence }.compact %>
-        <%= link_to "Previous", previous_page ? entries_path(pagination_params.merge(page: previous_page)) : "#",
-                    class: "px-3 py-1.5 rounded-md border border-slate-200 #{previous_page ? 'hover:border-indigo-300' : 'text-slate-300 cursor-not-allowed'}",
-                    data: { turbo_stream: true } %>
-        <%= link_to "Next", next_page ? entries_path(pagination_params.merge(page: next_page)) : "#",
-                    class: "px-3 py-1.5 rounded-md border border-slate-200 #{next_page ? 'hover:border-indigo-300' : 'text-slate-300 cursor-not-allowed'}",
-                    data: { turbo_stream: true } %>
+        <%
+          pagination_params = { q: @query.presence, category: @category.presence, language: @language_code.presence, starts_with: @starts_with.presence }.compact
+          prev_url = @pagy.prev ? entries_path(pagination_params.merge(page: @pagy.prev)) : nil
+          next_url = @pagy.next ? entries_path(pagination_params.merge(page: @pagy.next)) : nil
+        %>
+        <%= link_to "Previous", prev_url || "#",
+              class: "px-3 py-1.5 rounded-md border border-slate-200 #{'opacity-50 pointer-events-none' unless prev_url}",
+              data: (prev_url ? { turbo_stream: true } : {}) %>
+        <%= link_to "Next", next_url || "#",
+              class: "px-3 py-1.5 rounded-md border border-slate-200 #{'opacity-50 pointer-events-none' unless next_url}",
+              data: (next_url ? { turbo_stream: true } : {}) %>
       </div>
     </div>
   </div>

config/initializers/pagy.rb

@@ -0,0 +1,6 @@
+# Pagy Configuration
+require "pagy/extras/overflow"
+
+Pagy::DEFAULT[:items] = 25  # Match current 25 items per page
+Pagy::DEFAULT[:page_param] = :page
+Pagy::DEFAULT[:overflow] = :last_page

test/controllers/entries_controller_test.rb

@@ -41,7 +41,8 @@ class EntriesControllerTest < ActionDispatch::IntegrationTest
   test "should paginate results" do
     get entries_url, params: { page: 2 }
     assert_response :success
-    assert_select "div", text: /Page 2 of/i
+    assert_not_nil assigns(:pagy)
+    assert_select "div", text: /Displaying/i
   end
 
   test "should handle invalid language code" do

test/system/public_browsing_test.rb

@@ -102,7 +102,7 @@ class PublicBrowsingTest < ApplicationSystemTestCase
     visit root_path
 
     assert_selector ".entry-row", count: 25
-    assert_link "2"
+    assert_link "Next"
   end
 
   test "visitor sees entry statistics" do