@RequestMapping(value = "/projects/{projectName}/charts", method = RequestMethod.POST)
public String update(ModelMap map, @PathVariable String projectName, Chart chart) {
Project project = projectService.findProject(projectName);
Assert.notNull("chart name can't be null", chart.getName());
project.saveChart(chart);
projectService.saveProject(project);
map.put("project", project);
return "chart/list";
}