The Rails Way

The previous implementation, in Revision
541, was ugly. This is better.

app/models/page.rb

@@ -72,6 +72,10 @@ class Page < ActiveRecord::Base
     wiki_references.select { |ref| ref.wiki_word? }.map { |ref| ref.referenced_name }
   end
 
+  def categories
+    wiki_references.select { |ref| ref.category? }.map { |ref| ref.referenced_name }
+  end
+
   def linked_from
     web.select.pages_that_link_to(name)
   end

app/models/wiki_reference.rb

@@ -81,16 +81,6 @@ class WikiReference < ActiveRecord::Base
     row['name'].as_utf8 if row
   end
 
-  def self.page_categories(web, page_name)
-    query =
-      "SELECT referenced_name FROM wiki_references JOIN pages " +
-      "ON wiki_references.page_id = pages.id " +
-      "WHERE pages.name = ? " +
-      "AND wiki_references.link_type = '#{CATEGORY}' " +
-      "AND pages.web_id = '#{web.id}'"
-    names = connection.select_all(sanitize_sql([query, page_name])).map { |row| row['referenced_name'].as_utf8 }
-  end
-
   def self.pages_in_category(web, category)
     query = 
       "SELECT name FROM pages JOIN wiki_references " +
@@ -142,4 +132,8 @@ class WikiReference < ActiveRecord::Base
     link_type == WANTED_FILE
   end
 
+  def category?
+    link_type == CATEGORY
+  end
+
 end

app/views/wiki/edit.rhtml

@@ -69,8 +69,7 @@ function cleanAuthorName() {
 }
 
 document.forms["editForm"].elements["content"].focus();
-<%- if [:markdownMML, :markdownPNG, :markdown].include?(@web.markup) and 
+<%- if [:markdownMML, :markdownPNG, :markdown].include?(@web.markup) and !@page.categories.include?('S5-slideshow') -%>
-    !WikiReference.page_categories(@web, @page.name).include?('S5-slideshow') -%>
 addS5button('<%= CGI.escapeHTML(@page.name) %>');
 <%- end -%>
 //--><!]]>