Spring MVC，尝试编辑但创建新对象

我有一个MVC应用程序创建新的办公室，而不是在使用编辑表单时更新它们。请帮我理解为什么会发生这种情况。Spring MVC，尝试编辑但创建新对象

用于填充搜索结果的搜索方法：

@RequestMapping(value = "/searchResults", method = RequestMethod.POST) 
public ModelAndView search(@RequestParam String searchCriteria, HttpServletRequest request) { 
    List<Office> offices = officeServiceImpl.search(searchCriteria); 
    return new ModelAndView("searchResults", "offices", offices); 
}

这里是链接编辑表单看起来像搜索结果页上：

<a href="${pageContext.request.contextPath}/app/office/${office.getId()}/edit" class="btn btn-success">Edit Office</a>

这里是控制器的编辑GET方法用现有的办公室填写表格：

@RequestMapping(value = "/{officeId}/edit", method = RequestMethod.GET) 
@Transactional(noRollbackFor=NoResultException.class) 
public ModelAndView initUpdateOfficeForm(
    @PathVariable("officeId") Long officeId, Model model) { 
    Office office = officeServiceImpl.find(officeId); 
    //prepareEditFormModelAndView(office) just converts some objects to strings for typeahead form population 
    return prepareEditFormModelAndView(office); 
}

这里是编辑POST me的ThOD：

@RequestMapping(value = "/{officeId}/edit", method = RequestMethod.POST) 
public ModelAndView processUpdateOfficeForm(@ModelAttribute("office") @Valid Office office, 
     BindingResult result, SessionStatus status) { 
    if (! "united states of america".equals(office.getFolderStrings().toLowerCase())) { 
     //This portion of code converts the typeahead strings to objects 
     result = tryCountries(office, result); 
     result = tryDepartments(office, result); 
     result = tryEmployees(office, result); 
     } 
     if (result.hasErrors()) { 
     return prepareEditFormModelAndView(office); 
    } else { 
     officeServiceImpl.save(office); 
     status.setComplete(); 
     return new ModelAndView("editResult", "office", office); 
    } 
}

officeServiceImpl调用officeRepositoryImpl方法保存它看起来像：

@Override 
public Office save(Office office) { 
    em.merge(office); 
    em.flush(); 
    return office; 
}

感谢

编辑：添加prepareEditFormModelAndView（办公室），此方法试图从关联对象建立字符串：

@Transactional(noRollbackFor={NoResultException.class, IndexOutOfBoundsException.class}) 
private ModelAndView prepareEditFormModelAndView(Office office) { 
    String departmentStrings = ""; 
    String employeeStrings = ""; 

    List<OOM> officeOOMs = new ArrayList<OOM>(); 
    StringBuilder sb = new StringBuilder(); 
    try { 
     officeOOMs = oomServiceImpl.getOOMsForCurrentOffice(office.getId()); 
    } catch (NoResultException e) { 
     officeOOMs = null; 
    } 
    for (OOM o : officeOOMs) { 
     try { 
      Employee tempEmployee = employeeServiceImpl.find(o 
        .getEmployeeId()); 
      sb.append(tempEmployee.getDisplayName() + ", "); 
     } catch (NoResultException e) { 
      sb.append("Not found in system"); 
     } 
    } 
    employeeStrings = sb.toString(); 

    if ((! "".equals(office.getDepartmentStringsOnForm())) && office.getDepartmentStringsOnForm() != null) { 
     departmentStrings = office.getDepartmentStringsOnForm(); 
    } 
    String folderStrings = ""; 
    try { 
     folderStrings = kmlFolderServiceImpl.getInternationalOfficeString(office.getId()); 
     LOGGER.info("Folder Strings: " + folderStrings); 
    } catch (NoResultException e) { 
     folderStrings = ""; 
     LOGGER.info("Folder Strings: " + "no result"); 
    } 
    boolean isInternational = office.isInternational(); 
    ModelAndView result = new ModelAndView("editOfficeForm", "office", office); 
    result.addObject("departmentStrings", departmentStrings); 
    result.addObject("isInternational", isInternational); 
    result.addObject("folderStrings", folderStrings); 
    result.addObject("employeeStrings", employeeStrings); 
    return result; 
}

来源

2014-03-31 Joe Essey

prepareEditFormModelAndView做什么？ –

当你在邮局工作时，你也发送它的ID吗？ – geoand

@geoand，不，我没有通过身份证。我通过了办公室的模型属性。 –

我在添加以前的评论在这里，为了更好的澄清。根据OP，以下问题修复了以下问题：

当ID不在表单中时，当模型返回时，没有ID设置为使持久性提供者认为它是新实体的实体。因此，最明显的解决方案是在保存操作中发布实体的ID（可能使用隐藏字段）。

另一种解决方案是尝试基于某个业务密钥加载数据库中的实体以查看实体是否为新实体。

来源

2014-04-01 11:36:14 geoand

Spring MVC，尝试编辑但创建新对象

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