def update
    @channel = Channel.find(params[:id])

    respond_to do |format|
      if @channel.update_attributes(params[:channel])
        flash[:notice] = 'Channel was successfully updated.'
        format.html { redirect_to(@channel) }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @channel.errors, :status => :unprocessable_entity }
      end
    end
  end