我正在尝试访问我的百里香对象列表并进行遍历。
我尝试访问的项目类如下:
data class Orders(val orders: List<Order>)
data class Order(val orderNumber: Long,
val time: String,
val name: String,
val zipCode: Int,
val recipientType: String?,
val recipientName: String?,
val recipientZipCode: String?,
val recipientCity: String?,
val shoppingNote: String?,
val id: Int,
val orderRows: List<OrderRow>)
data class OrderRow(val id: Int,
val variantTitle: String,
val productTitle: String,
val amount: Int,
val units: List<Unit>)
data class Unit(val code: String,
val redeemed: Boolean?)
我用来将订单列表提供给模板的控制器如下:
@RequestMapping("/user")
fun welcome(model: Model, principal: Principal): String {
val user = userService.getUserInfo(principal.name)
val listOfOrders = supplierService.getOrders(email, apiKey).orders
model.addAttribute("user", user)
model.addAttribute("listOfOrders", listOfOrders)
return "user"
}
和我正在使用的模板如下
<div class="container">
<table class="table" th:object="${listOfOrders}">
<thead>
<th>#</th>
<th>Navn</th>
<th>ID</th>
</thead>
<tbody>
<th:block th:each="order: ${listOfOrders}">
<tr class="accordion-toggle"
data-toggle="collapse"
th:data-target="'#accordion_'+${order.id}">
<td th:text="${order.orderNumber}"></td>
<td th:text="${order.name}"></td>
<td th:text="${order.id}"></td>
</tr>
<tr>
<td></td>
<td colspan="6">
<div th:id="'accordion_'+${order.id}" class="collapse in">
<table class="table">
<thead>
<th>#</th>
<th>Navn</th>
<th>ID</th>
</thead>
<tbody>
<th:block th:each="row: ${order.orderRows}">
<tr class="accordion-toggle"
data-toggle="collapse"
th:data-target="'#accordion_'+${row.id}">
<td th:text="${row.amount}"></td>
<td th:text="${row.productTitle}"></td>
<td th:text="${row.id}"></td>
</tr>
<tr>
<td></td>
<td colspan="6">
<div th:id="'accordion_'+${row.id}" class="collapse in">
Nothing to show yet.
</div>
</td>
</tr>
</th:block>
</tbody>
</table>
</div>
</td>
</tr>
</th:block>
</tbody>
</table>
</div>
并且我将listOfOrders用作th:object的第一个块运行良好,但是对于第二个迭代,我尝试访问Order的orderRows失败,并显示以下两条消息
org.thymeleaf.exceptions.TemplateProcessingException:异常 评估SpringEL表达式:“ order.orderRows”(模板:“用户”- 第50行,第39列)
org.springframework.expression.spel.SpelEvaluationException:EL1007E: 无法在null上找到属性或字段“ orderRows”
我目前对此深感困惑,因为一旦可以遍历Orders orderRows,我还需要遍历orderRows单位。
并且我已经验证了添加到模型中的listOfOrders确实确实具有orderRows和orderRows.units。
关于我所缺少的任何建议或使它起作用的建议吗?