Don't let _ be contained in polymorphic class. Fixes #12

lib/ransack/adapters/active_record/3.0/context.rb

@@ -135,7 +135,7 @@ module Ransack
           found_association = @join_dependency.join_associations.detect do |assoc|
             assoc.reflection.name == name &&
             assoc.parent == parent &&
-            (!klass || assoc.klass == klass)
+            (!klass || assoc.reflection.klass == klass)
           end
           unless found_association
             @join_dependency.send(:build_polymorphic, name.to_sym, parent, Arel::Nodes::OuterJoin, klass)

lib/ransack/adapters/active_record/context.rb

@@ -140,7 +140,7 @@ module Ransack
           found_association = @join_dependency.join_associations.detect do |assoc|
             assoc.reflection.name == name &&
             assoc.parent == parent &&
-            (!klass || assoc.klass == klass)
+            (!klass || assoc.reflection.klass == klass)
           end
           unless found_association
             @join_dependency.send(:build_polymorphic, name.to_sym, parent, Arel::Nodes::OuterJoin, klass)

lib/ransack/context.rb

@@ -95,7 +95,7 @@ module Ransack
     end
 
     def unpolymorphize_association(str)
-      if (match = str.match(/_of_(.+?)_type$/))
+      if (match = str.match(/_of_([^_]+?)_type$/))
         [match.pre_match, Kernel.const_get(match.captures.first)]
       else
         [str, nil]

spec/ransack/search_spec.rb

@@ -31,6 +31,16 @@ module Ransack
         condition.value.should eq 'Ernie'
       end
 
+      it 'creates Conditions for multiple polymorphic belongs_to association attributes' do
+        search = Search.new(Note, :notable_of_Person_type_name_or_notable_of_Article_type_title_eq => 'Ernie')
+        condition = search.base[:notable_of_Person_type_name_or_notable_of_Article_type_title_eq]
+        condition.should be_a Nodes::Condition
+        condition.predicate.name.should eq 'eq'
+        condition.attributes.first.name.should eq 'notable_of_Person_type_name'
+        condition.attributes.last.name.should eq 'notable_of_Article_type_title'
+        condition.value.should eq 'Ernie'
+      end
+
       it 'discards empty conditions' do
         search = Search.new(Person, :children_name_eq => '')
         condition = search.base[:children_name_eq]