[英]Spring MVC @ModelAttribute bind subclasses
I have 2 entity classes named District and Street, in View, to form is assigned Street object. 我在View中有2个名为District和Street的实体类,向表单分配了Street对象。 How can I bind value of Street.district.id ? 如何绑定Street.district.id的值? On for submitting I get NullPointerException . 在提交时,我得到NullPointerException 。
View entities and form: 查看实体和形式:
<form class="form-inline" action="#" th:action="@{/direct/api/v1/newStreet}" th:object="${street}" method="POST">
<div class="form-group">
<label for="name">Name</label>
<input type="text" th:field="*{name}" class="form-control" id="name" placeholder="Street name"/>
</div>
<div class="form-group">
<label for="district">District</label>
<select class="form-control" id="district">
<option th:each="d : ${districts}" th:field="*{district.id}" th:value="${d.id}" th:text="${d.name}"></option>
</select>
</div>
<button type="submit" class="btn btn-default">Save</button>
Controller: 控制器:
@RequestMapping(value = "/newStreet", method = RequestMethod.POST)
public String newStreet(@ModelAttribute Street street){
log.info(street.getName());
log.info(String.valueOf(street.getDistrict().getId()));
return "redirect:/streets";
}
On form submitting I get Street name from input and null District. 在提交表单时,我从输入中获得街道名称,而空地区。
Your error is in the select. 您的错误在选择中。
The attribute 属性
th:field="*{district.id}" th:field =“ * {district.id}”
should be in the select not in the option tag 应该在select中而不是在option标记中
Result: 结果:
<select class="form-control" id="district" th:field="*{district.id}">
<option th:each="d : ${districts}" th:value="${d.id}" th:text="${d.name}"></option>
</select>
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