Implemented Arbre::HTML::Tag#default_id_for_prefix

This method can be overriden in subclasses of Tag to add a prefix to the
auto generated id when an object is passed in using :for

lib/arbre/html/tag.rb

@@ -162,7 +162,7 @@ def dom_id_for(record)
  record.object_id
  end
 
- [dom_class_name_for(record), id].join("_")
+ [default_id_for_prefix, dom_class_name_for(record), id].compact.join("_")
  end
 
  def default_id_for_prefix

spec/arbre/unit/html/tag_spec.rb

@@ -31,6 +31,22 @@
  it "should add a class name" do
  tag.class_list.should include("resource_class")
  end
+
+ describe "with a default_id_for_prefix" do
+
+ let(:tag) do
+ Class.new(Arbre::HTML::Tag) do
+ def default_id_for_prefix
+ "a_prefix"
+ end
+ end.new
+ end
+
+ it "should set the id to the type and id" do
+ tag.id.should == "a_prefix_resource_class_5"
+ end
+
+ end
  end
 
  describe "css class names" do