Minor fixes

app/models/course.rb

@@ -87,6 +87,10 @@ class Course < ActiveRecord::Base
     period == App.current_period ? short_name : id.to_s
   end
 
+  def self.pluck_periods
+    Course.uniq.pluck(:period).reject!(&:blank?).sort.reverse
+  end
+
   def self.from_param(param)
     param.is_numeric? ? Course.find(param) : Course.find_by_short_name!(param)
   end

app/models/wiki_page.rb

@@ -44,6 +44,8 @@ class WikiPage < ActiveRecord::Base
   validates_uniqueness_of :title, scope: :course_id
   validates_uniqueness_of :canonical_title, scope: :course_id
   validates_format_of :title, with: /^[^0-9]/
+  validate :check_wiki_syntax
+
 
   before_validation :set_canonical_title
   before_save :set_position
@@ -68,11 +70,10 @@ class WikiPage < ActiveRecord::Base
     end
   end
 
-  def validate
+  def check_wiki_syntax
     content.format_wiki
   rescue
-    errors.add("content", "possui erro de sintaxe: " +
-               $ERROR_INFO.to_s.html_escape)
+    errors.add("content", "possui erro de sintaxe")
   end
 
   def to_param