diff --git a/app/assets/javascripts/cocoon.js b/app/assets/javascripts/cocoon.js
index 6ddc7be..dffa378 100644
--- a/app/assets/javascripts/cocoon.js
+++ b/app/assets/javascripts/cocoon.js
@@ -5,7 +5,7 @@
     content.replace(reg_exp, with_str);
   }
 
-  function trigger_befofe_removal_callback(node) {
+  function trigger_before_removal_callback(node) {
     node.trigger('before-remove.cocoon');
   }
 
@@ -78,4 +78,4 @@
     trigger_after_removal_callback(trigger_node);
   });
 
-})(jQuery);
\ No newline at end of file
+})(jQuery);
diff --git a/lib/cocoon/view_helpers.rb b/lib/cocoon/view_helpers.rb
index 7b66e7c..f83a207 100644
--- a/lib/cocoon/view_helpers.rb
+++ b/lib/cocoon/view_helpers.rb
@@ -92,12 +92,28 @@ module Cocoon
     def create_object(f, association)
       assoc = f.object.class.reflect_on_association(association)
 
-      if assoc.class.name == "Mongoid::Relations::Metadata"
-        conditions = assoc.respond_to?(:conditions) ? assoc.conditions.flatten : []
-        assoc.klass.new(*conditions)
+      assoc ? create_object_on_association(f, association, assoc) : create_object_on_non_association(f, association)
+    end
+
+    def get_partial_path(partial, association)
+      partial ? partial : association.to_s.singularize + "_fields"
+    end
+
+    private
+
+    def create_object_on_non_association(f, association)
+      builder_method = %W{build_#{association} build_#{association.to_s.singularize}}.select { |m| f.object.respond_to?(m) }.first
+      return f.object.send(builder_method) if builder_method
+      raise "Association #{association} doesn't exist on #{f.object.class}"
+    end
+
+    def create_object_on_association(f, association, instance)
+      if instance.class.name == "Mongoid::Relations::Metadata"
+        conditions = instance.respond_to?(:conditions) ? instance.conditions.flatten : []
+        instance.klass.new(*conditions)
       else
         # assume ActiveRecord or compatible
-        if assoc.collection?
+        if  instance.collection?
           f.object.send(association).build
         else
           f.object.send("build_#{association}")
@@ -105,9 +121,5 @@ module Cocoon
       end
     end
 
-    def get_partial_path(partial, association)
-      partial ? partial : association.to_s.singularize + "_fields"
-    end
-
   end
 end
diff --git a/spec/cocoon_spec.rb b/spec/cocoon_spec.rb
index 355d650..ec46dca 100644
--- a/spec/cocoon_spec.rb
+++ b/spec/cocoon_spec.rb
@@ -191,6 +191,22 @@ describe Cocoon do
         result = @tester.create_object(stub(:object => Comment.new), :post)
         result.should be_a Post
       end
+
+      it "should raise error if cannot reflect on association" do
+        expect { @tester.create_object(stub(:object => Comment.new), :not_existing) }.to raise_error /association/i
+      end
+
+      it "should create an association if object responds to 'build_association' as singular" do
+        object = Comment.new
+        object.should_receive(:build_custom_item).and_return 'custom'
+        @tester.create_object(stub(:object => object), :custom_item).should == 'custom'
+      end
+
+      it "should create an association if object responds to 'build_association' as plural" do
+        object = Comment.new
+        object.should_receive(:build_custom_item).and_return 'custom'
+        @tester.create_object(stub(:object => object), :custom_items).should == 'custom'
+      end
     end
 
     context "get_partial_path" do