我正在开发一个管理客户机器的应用程序。 我已经创建了所有必要的表，模式，控制器等。
客户端实体具有List和Machine具有客户关系（bidiretional，non-optional）。
我遇到的问题与向现有客户端添加全新机器有关（提供此机器已存在）。
所以这里有一些简短的代码：
@Controller
public class MachineController {
...
@GetMapping("/machines/add/{clientId}")
public String addMachine(@PathVariable("clientId") int clientId, Model model) throws ClientNotFoundException {
model.addAttribute("machineTypes", MachineType.values());
model.addAttribute("machine", new Machine());
model.addAttribute("client", clientService.find(clientId));
return "machines/form";
}
}
@PostMapping("/machines/save")
public String saveMachine(@ModelAttribute @Valid Machine machine, BindingResult bindingResult, Model model)
throws ClientNotFoundException {
model.addAttribute("machineTypes", MachineType.values());
int clientId = machine.getClient().getId();
LOG.debug("ClientId:{}", clientId);
// Client object is not filled here ! clientId is 0 (new client).
}
问题在于保存功能 - 我不知道如何传递由HTTP POST发送的Machine对象的exisitng Client对象。 我的控制器抱怨客户端没有发送，BindingResult抛出错误：
字段'client.address.city上的对象'machine'中的字段错误： 被拒绝的价值[null];字段中对象“机器”中的字段错误 'client.address.zipCode：被拒绝的值[null];对象中的字段错误 字段'client.name'上的'machine'：拒绝值[null];
我正在寻求任何帮助。
HTML表格如下：
<form class="form-horizontal" th:action="@{/machines/save}" th:object="${machine}" method="post" id="machineForm">
<input type="hidden" th:field="*{id}"/>
<!-- Panel for machine -->
<div th:class="${#fields.hasErrors('machineType')}? 'form-group has-error has-feedback' : 'form-group'">
<label class="control-label col-sm-4" for="manufacturer">Rodzaj:*</label>
<div class="col-sm-8">
<select th:field="${machine.machineType}" class="form-control" id="machineTypeSelect">
<option value="" disabled="disabled" selected="selected">Wybierz rodzaj</option>
<option th:each="type: ${machineTypes}" th:value="${type.name()}" th:text="${type}" th:attr="data-has-car=${type.hasCar()}"></option>
</select>
<div class="help-block" th:if="${#fields.hasErrors('machineType')}"
th:errors="*{machineType}"></div>
</div>
</div>
<div th:class="${#fields.hasErrors('manufacturer')}? 'form-group has-error has-feedback' : 'form-group'">
<label class="control-label col-sm-4" for="manufacturer">Producent:*</label>
<div class="col-sm-8">
<input type="text"
class="form-control"
id="manufacturer"
placeholder="Podaj producenta"
th:field="*{manufacturer}" />
<div class="help-block" th:if="${#fields.hasErrors('manufacturer')}"
th:errors="*{manufacturer}"></div>
</div>
</div>
<div th:class="${#fields.hasErrors('model')}? 'form-group has-error has-feedback' : 'form-group'">
<label class="control-label col-sm-4" for="model">Model:</label>
<div class="col-sm-8">
<input type="text"
class="form-control"
id="model"
placeholder="Podaj model"
th:field="*{model}"/>
<div class="help-block" th:if="${#fields.hasErrors('model')}"
th:errors="*{model}"></div>
</div>
</div>
<div th:class="${#fields.hasErrors('productionYear')}? 'form-group has-error has-feedback' : 'form-group'">
<label class="control-label col-sm-4" for="productionYear">Rok produkcji:*</label>
<div class="col-sm-8">
<input type="number"
class="form-control"
id="productionYear"
placeholder="Podaj rok produkcji"
th:field="*{productionYear}"/>
<div class="help-block" th:if="${#fields.hasErrors('productionYear')}"
th:errors="*{productionYear}"></div>
</div>
</div>
<div th:class="${#fields.hasErrors('factoryNo')}? 'form-group has-error has-feedback' : 'form-group'">
<label class="control-label col-sm-4" for="factoryNo">Numer fabryczny:</label>
<div class="col-sm-8">
<input type="number"
class="form-control"
id="factoryNo"
placeholder="Podaj numer fabryczny"
th:field="*{factoryNo}"/>
<div class="help-block" th:if="${#fields.hasErrors('factoryNo')}"
th:errors="*{factoryNo}"></div>
</div>
</div>
<div th:class="${#fields.hasErrors('maxLoad')}? 'form-group has-error has-feedback' : 'form-group'">
<label class="control-label col-sm-4" for="maxLoad">Max udżwig:</label>
<div class="col-sm-8">
<div class="input-group">
<input type="number"
class="form-control"
id="maxLoad"
placeholder="Max. udźwig"
aria-describedby="measure"
th:field="*{maxLoad}"/>
<span class="input-group-addon" id="measure">kg</span>
</div>
<div class="help-block" th:if="${#fields.hasErrors('maxLoad')}"
th:errors="*{maxLoad}"></div>
</div>
</div>
<div th:object="${machine.client}">
<div th:class="${#fields.hasErrors('id')}? 'form-group has-error has-feedback' : 'form-group'">
<label class="control-label col-sm-4" for="clientId">Wybrany klient:</label>
<div class="col-sm-8">
<span class="form-control-static" id="selectedClient">Nie wybrano! Wyszukaj po prawej</span>
<input type="hidden" th:field="${machine.client.id}" id="clientId" />
<div class="help-block" th:if="${#fields.hasErrors('id')}"
th:errors="${machine.client.id}"></div>
</div>
</div>
</div>
<div id="machineCar" th:object="${machine.car}">
<div th:class="${#fields.hasErrors('make')}? 'form-group has-error has-feedback' : 'form-group'">
<label class="control-label col-sm-4" for="carMake">Marka pojazdu:*</label>
<div class="col-sm-8">
<input type="text"
class="form-control"
id="carMake"
placeholder="Podaj markę pojazdu"
th:field="*{make}"/>
<div class="help-block" th:if="${#fields.hasErrors('make')}"
th:errors="*{make}"></div>
</div>
</div>
<div th:class="${#fields.hasErrors('vin')}? 'form-group has-error has-feedback' : 'form-group'">
<label class="control-label col-sm-4" for="factoryNo">VIN:</label>
<div class="col-sm-8">
<input type="number"
class="form-control"
id="vin"
placeholder="Podaj numer VIN"
th:field="*{vin}"/>
<div class="help-block" th:if="${#fields.hasErrors('vin')}"
th:errors="*{vin}"></div>
</div>
</div>
</div>
<div class="form-group">
<div class="col-xs-12">
<button type="submit" class="btn btn-primary">Zapisz dane</button>
</div>
</div>
</form>
答案 0 :(得分：0)
尝试添加
<input type="hidden" name="client.id" value="${client.id}" />
在HTML格式的表单中，将创建具有 id 值的客户端对象，然后将其余对象留给存储库，只需要id来关联记录。
答案 1 :(得分：0)
我解决了我的问题。不确定它是否是正确的解决方案，但有效。
所以，只需在机器实体中：
public class Machine {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "MACHINE_SEQUENCE")
private int id;
// ...
@ManyToOne(optional = false, fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST, CascadeType.MERGE} )
@JoinColumn(name = "client_id", nullable = false)
@Valid // REMOVED
private Client client;
我已在客户端字段顶部删除了@Valid注释，因此Spring MVC不再验证Thymeleaf表单。
另一种解决方案是将隐藏的输入包含在客户端详细信息（名称，公司和子地址对象）中，以便百万富翁可以传输完整的对象而BindingResult不会抱怨......