Refactor user relationships to use a Turbo Stream-backed pagination

app/controllers/user_controller.rb

@@ -26,11 +26,11 @@ class UserController < ApplicationController
     @relationships_last_id = @relationships.map(&:id).min
     @more_data_available = !@user.cursored_follower_relationships(last_id: @relationships_last_id, size: 1).count.zero?
     @users = @relationships.map(&:source)
-    @type = :friend
+    @type = :follower
 
     respond_to do |format|
       format.html { render "show_follow" }
-      format.js { render "show_follow", layout: false }
+      format.turbo_stream { render "show_follow" }
     end
   end
 
@@ -46,7 +46,7 @@ class UserController < ApplicationController
 
     respond_to do |format|
       format.html { render "show_follow" }
-      format.js { render "show_follow", layout: false }
+      format.turbo_stream { render "show_follow" }
     end
   end
   # rubocop:enable Metrics/AbcSize

app/views/user/show_follow.haml

@@ -1,14 +1,17 @@
-.row.row-cols-1.row-cols-sm-2.row-cols-md-3#users
-  - @users.each do |user|
-    .col.pb-3
-      = render 'shared/userbox', user: user, type: @type
+= turbo_frame_tag "user_#{@type}" do
+  .row.row-cols-1.row-cols-sm-2.row-cols-md-3#users
+    - @users.each do |user|
+      .col.pb-3
+        = render 'shared/userbox', user: user, type: @type
 
-= render 'shared/cursored_pagination_dummy', more_data_available: @more_data_available, last_id: @relationships_last_id
-
-- if @more_data_available
-  .d-flex.justify-content-center.justify-content-sm-start
-    %button.btn.btn-light#load-more-btn{ type: :button, data: { last_id: @relationships_last_id } }
-      = t("voc.load")
+  - if @more_data_available
+    .d-flex.justify-content-center.justify-content-sm-start#paginator
+      - if @type === :follower
+        = button_to show_user_followers_path(@user, last_id: @relationships_last_id), class: "btn btn-light" do
+          = t("voc.load")
+      - else
+        = button_to show_user_followings_path(@user, last_id: @relationships_last_id), class: "btn btn-light" do
+          = t("voc.load")
 
 - provide(:title, user_title(@user, 'friends and followers'))
 - parent_layout 'user/profile'

app/views/user/show_follow.js.erb

@@ -1,8 +0,0 @@
-$('#users').append('<% @users.each do |user|
-  %><div class="col pb-3"><%= j render 'shared/userbox', user: user, type: @type
-%></div><% end %>');
-<% if @more_data_available %>
-  $('#pagination').html('<%= j render 'shared/cursored_pagination_dummy', more_data_available: @more_data_available, last_id: @relationships_last_id %>');
-<% else %>
-  $('#pagination, #load-more-btn').remove();
-<% end %>

app/views/user/show_follow.turbo_stream.haml

@@ -0,0 +1,13 @@
+= turbo_stream.append "users" do
+  - @users.each do |user|
+    .col.pb-3
+      = render 'shared/userbox', user: user, type: @type
+
+= turbo_stream.update "paginator" do
+  - if @more_data_available
+    - if @type === :follower
+      = button_to show_user_followers_path(@user, last_id: @relationships_last_id), class: "btn btn-light" do
+        = t("voc.load")
+    - else
+      = button_to show_user_followings_path(@user, last_id: @relationships_last_id), class: "btn btn-light" do
+        = t("voc.load")

config/routes.rb

@@ -149,9 +149,9 @@ Rails.application.routes.draw do
   match "/@:username(/p/:page)", to: "user#show", via: [:get, :post], as: :user, defaults: { page: 1 }
   get "/@:username/a/:id", to: "answer#show", via: "get", as: :answer
   get "/@:username/q/:id", to: "question#show", via: "get", as: :question
-  get "/@:username/followers(/p/:page)", to: "user#followers", as: :show_user_followers, defaults: { page: 1 }
-  get "/@:username/followings(/p/:page)", to: "user#followings", as: :show_user_followings, defaults: { page: 1 }
-  get "/@:username/friends(/p/:page)", to: redirect("/@%{username}/followings/p/%{page}"), defaults: { page: 1 }
+  match "/@:username/followers(/p/:page)", to: "user#followers", via: [:get, :post], as: :show_user_followers, defaults: { page: 1 }
+  match "/@:username/followings(/p/:page)", to: "user#followings", via: [:get, :post], as: :show_user_followings, defaults: { page: 1 }
+  match "/@:username/friends(/p/:page)", to: redirect("/@%{username}/followings/p/%{page}"), via: [:get, :post], defaults: { page: 1 }
   match "/@:username/questions(/p/:page)", to: "user#questions", via: [:get, :post], as: :show_user_questions, defaults: { page: 1 }
   get "/:username(/p/:page)", to: "user#show", as: :user_alt, defaults: { page: 1 }
   get "/:username/a/:id", to: "answer#show", as: :answer_alt