Allow removal of element attributes.

lib/oga/xml/element.rb

@@ -138,6 +138,20 @@ module Oga
         end
       end
 
+      ##
+      # Removes an attribute from the element.
+      #
+      # @param [String] name The name (optionally including namespace prefix)
+      #  of the attribute to remove.
+      #
+      # @return [Oga::XML::Attribute]
+      #
+      def unset(name)
+        found = attribute(name)
+
+        return attributes.delete(found) if found
+      end
+
       ##
       # Returns the namespace of the element.
       #

spec/oga/xml/element_spec.rb

@@ -170,6 +170,29 @@ describe Oga::XML::Element do
     end
   end
 
+  context '#unset' do
+    before do
+      @element = described_class.new
+
+      @element.register_namespace('x', 'test')
+
+      @element.set('foo', 'bar')
+      @element.set('x:foo', 'bar')
+    end
+
+    example 'remove an attribute by its name' do
+      @element.unset('foo')
+
+      @element.get('foo').should be_nil
+    end
+
+    example 'remove an attribute using a namespace' do
+      @element.unset('x:foo')
+
+      @element.get('x:foo').should be_nil
+    end
+  end
+
   context '#namespace' do
     example 'return the namespace' do
       namespace = Oga::XML::Namespace.new(:name => 'x')