categories.rb in picky-4.12.7

- old
+ new

@@ -5,10 +5,12 @@
     attr_reader :categories, :category_hash
 
     forward :each,
             :first,
             :map,
+            :map!,
+            :include?,
             :to => :categories
 
     each_forward :cache,
                  :dump,
                  :empty,
@@ -49,10 +51,10 @@
 
     # Add the given category to the list of categories.
     #
     def << category
       reset_qualifier_mapper # TODO Have an add method on QualifierMapper?
-      categories << category
+      categories << category unless categories.include? category # This is wrong, and needs to be handled in index.rb
       category_hash[category.name] = category
     end
 
     # Find a given category in the categories.
     #
\ No newline at end of file