Search engine: issue custom fields can now be searched.

Each issue custom field (excepting numeric, date and boolean fields) can be marked as "Searchable" (default to false).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@994 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/custom_field.rb

@@ -43,6 +43,8 @@ class CustomField < ActiveRecord::Base
   def before_validation
     # remove empty values
     self.possible_values = self.possible_values.collect{|v| v unless v.empty?}.compact
+    # make sure these fields are not searchable
+    self.searchable = false if %w(int float date bool).include?(field_format)
   end
   
   def validate