Change WikiPage#directory

app/models/wiki_page.rb

@@ -25,10 +25,10 @@ class WikiPage
     pages.sort_by { |page| [page.directory, page.slug] }.
       group_by { |page| page.directory }.
       map do |dir, pages|
-        if dir == '/'
-          pages
-        else
+        if dir.present?
           WikiDirectory.new(dir, pages)
+        else
+          pages
         end
       end.
       flatten
@@ -98,8 +98,7 @@ class WikiPage
 
   # The hierarchy of the directory this page is contained in.
   def directory
-    dir = wiki.page_title_and_dir(slug).last
-    "/#{dir}"
+    wiki.page_title_and_dir(slug).last
   end
 
   # The processed/formatted content of this page.

spec/models/wiki_page_spec.rb

@@ -252,11 +252,11 @@ describe WikiPage, models: true do
 
   describe '#directory' do
     context 'when the page is at the root directory' do
-      it 'returns /' do
+      it 'returns an empty string' do
         create_page('file', 'content')
         page = wiki.find_page('file')
 
-        expect(page.directory).to eq('/')
+        expect(page.directory).to eq('')
       end
     end
 
@@ -265,7 +265,7 @@ describe WikiPage, models: true do
         create_page('dir_1/dir_1_1/file', 'content')
         page = wiki.find_page('dir_1/dir_1_1/file')
 
-        expect(page.directory).to eq('/dir_1/dir_1_1')
+        expect(page.directory).to eq('dir_1/dir_1_1')
       end
     end
   end