Spring MVC，嘗試編輯但創建新對象

我有一個MVC應用程序創建新的辦公室，而不是在使用編輯表單時更新它們。請幫我理解爲什麼會發生這種情況。Spring MVC，嘗試編輯但創建新對象

用於填充搜索結果的搜索方法：

@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); 
}

這裏是鏈接編輯表單看起來像搜索結果頁上：

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

這裏是控制器的編輯GET方法用現有的辦公室填寫表格：

@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); 
}

這裏是編輯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調用officeRepositoryImpl方法保存它看起來像：

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

感謝

編輯：添加prepareEditFormModelAndView（辦公室），此方法試圖從關聯對象建立字符串：

@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; 
}

來源

2014-03-31 Joe Essey

prepareEditFormModelAndView做什麼？ –

當你在郵局工作時，你也發送它的ID嗎？ – geoand

@geoand，不，我沒有通過身份證。我通過了辦公室的模型屬性。 –

我在添加以前的評論在這裏，爲了更好的澄清。根據OP，以下問題修復了以下問題：

當ID不在表單中時，當模型返回時，沒有ID設置爲使持久性提供者認爲它是新實體的實體。因此，最明顯的解決方案是在保存操作中發佈實體的ID（可能使用隱藏字段）。

另一種解決方案是嘗試基於某個業務密鑰加載數據庫中的實體以查看實體是否爲新實體。

來源

2014-04-01 11:36:14 geoand

Spring MVC，嘗試編輯但創建新對象

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