This is a robust approach to making controller/{conference_name}/* case insensitive. Richard reported this issue in regards to West2026 flyer.

app/controllers/administration_controller.rb

@@ -9,7 +9,7 @@ class AdministrationController < ApplicationController
 
   def edit
     return do_404 unless logged_in? && current_user.administrator?
-    @this_conference = Conference.find_by!(slug: params[:slug])
+    @this_conference = Conference.find_by!("LOWER(slug) = LOWER(?)", params[:slug])
     @page_title = 'articles.conferences.headings.edit'
     @main_title_vars = { vars: { title: @this_conference.title } }
     render 'new'

app/controllers/application_controller.rb

@@ -123,7 +123,7 @@ class ApplicationController < BaseController
     @page_title ||= 'page_titles.403.Please_Check_Email'
 
     if (request.present? && request.referrer.present? && conference = /^\/conferences\/(\w+)\/register\/?$/.match(request.referrer.gsub(/^https?:\/\/.*?\//, '/')))
-      @this_conference = Conference.find_by!(slug: conference[1])
+      @this_conference = Conference.find_by!("LOWER(slug) = LOWER(?)", conference[1])
       @banner_image = @this_conference.cover_url
       template = 'conferences/email_confirm'
     end
@@ -283,7 +283,7 @@ class ApplicationController < BaseController
       @page_title ||= 'page_titles.403.Please_Check_Email'
 
       if (request.present? && request.referrer.present? && conference = /^\/conferences\/(\w+)\/register\/?$/.match(request.referrer.gsub(/^https?:\/\/.*?\//, '/')))
-        @this_conference = Conference.find_by!(slug: conference[1])
+        @this_conference = Conference.find_by!("LOWER(slug) = LOWER(?)", conference[1])
         @banner_image = @this_conference.cover_url
         template = 'conferences/email_confirm'
       end
@@ -617,7 +617,7 @@ class ApplicationController < BaseController
 
   protected
     def set_conference
-      @this_conference = Conference.find_by!(slug: params[:slug])
+      @this_conference = Conference.find_by!("LOWER(slug) = LOWER(?)", params[:slug])
     end
 
     def set_conference_registration

app/controllers/conference_administration_controller.rb

@@ -76,7 +76,7 @@ class ConferenceAdministrationController < ApplicationController
 
   def previous_stats
     set_conference
-    conference = Conference.find_by_slug(params[:conference_slug])
+    conference = Conference.find_by("LOWER(slug) = LOWER(?)", params[:conference_slug])
     return do_403 unless conference.is_public
     get_stats(false, nil, conference)
     logger.info "Generating #{conference.slug}.xls"

config/initializers/slug_constraint.rb

@@ -0,0 +1,6 @@
+class SlugConstraint
+  def matches?(request)
+    request.params[:slug] = request.params[:slug].downcase if request.params[:slug]
+    true
+  end
+end

config/routes.rb

@@ -3,6 +3,10 @@ Sidekiq::Web.set :sessions, false
 
 BikeBike::Application.routes.draw do
 
+  # Redirect uppercase CONFERENCES to lowercase conferences
+  get '/CONFERENCES(*anything)', to: redirect { |params, request| "/conferences#{params[:anything]}" }
+  get '/CONFERENCES', to: redirect('/conferences')
+
   # Conferences
   scope :conferences do
     root 'conferences#list', as: :conferences
@@ -10,7 +14,7 @@ BikeBike::Application.routes.draw do
     get 'new' => 'administration#new', as: :new_conference
     post 'save' => 'administration#save', as: :save_conference
 
-    scope ':slug', constraints: { slug: /[^\/]+/ } do
+    scope ':slug', constraints: SlugConstraint.new do
       root 'conferences#view', as: :conference
       
       get 'edit' => 'administration#edit', as: :edit_conference