FIX: Bad page title for categories view by google crawler

app/controllers/application_controller.rb

@@ -212,6 +212,10 @@ class ApplicationController < ActionController::Base
     @guardian ||= Guardian.new(current_user)
   end
 
+  def current_homepage
+    current_user ? SiteSetting.homepage : SiteSetting.anonymous_homepage
+  end
+
   def serialize_data(obj, serializer, opts=nil)
     # If it's an array, apply the serializer as an each_serializer to the elements
     serializer_opts = {scope: guardian}.merge!(opts || {})

app/controllers/categories_controller.rb

@@ -24,6 +24,10 @@ class CategoriesController < ApplicationController
 
     discourse_expires_in 1.minute
 
+    unless current_homepage == 'categories'
+      @title = I18n.t('js.filters.categories.title')
+    end
+
     store_preloaded("categories_list", MultiJson.dump(CategoryListSerializer.new(@list, scope: guardian)))
     respond_to do |format|
       format.html { render }

app/controllers/list_controller.rb

@@ -60,7 +60,6 @@ class ListController < ApplicationController
         list_opts[:no_definitions] = true
       end
 
-
       list = TopicQuery.new(user, list_opts).public_send("list_#{filter}")
       list.more_topics_url = construct_url_with(:next, list_opts)
       list.prev_topics_url = construct_url_with(:prev, list_opts)
@@ -69,7 +68,7 @@ class ListController < ApplicationController
         @rss = filter
 
         # Note the first is the default and we don't add a title
-        if idx > 0 && use_crawler_layout?
+        if (filter.to_s != current_homepage) && use_crawler_layout?
           filter_title = I18n.t("js.filters.#{filter.to_s}.title")
           if list_opts[:category]
             @title = I18n.t('js.filters.with_category', filter: filter_title, category: Category.find(list_opts[:category]).name)

app/views/categories/index.html.erb

@@ -23,4 +23,4 @@
   <% end %>
 </div>
 
-<% content_for :title do %><%= I18n.t('js.filters.categories.title') %><% end %>
+<% content_for :title do %><%= @title %><% end %>