简单模式的非法开始 - 播放框架

Question

我是玩框架的新手。在尝试使用 play 生成 html 模板时，我在 ticket.getTicketIds 行收到错误 illegal start of simple pattern。一直在花一些时间试图解决这个问题，但没有用。

<tbody>
    @for( ticket <- @obj.getPurchasedTickets() ) {
      @for( (key,val) <- @obj.getTicketsCalculation() ) {
       @if( key.equals(ticket.getTicketId())) {
          <tr>
            <td class="desc">@ticket.getTicketName()<br></br>
            @if(ticket.getTicketIds() != null && !ticket.getTicketIds().isEmpty()) {
                @for( ticketid <- ticket.getTicketIds ){
                    #@ticketid 
                }
            }
            </td>
            <td class="unit">@ticket.getPrice()</td>
          </tr>
          }
       }
     }
 </tbody>  

以下 POJO 用于获取必要的值

public class PurchasedTicket {

  private String ticketId; // represents the ticket's id
  private String ticketName;
  private Integer numberOfTickets;
  private Double price;  
  private List<String> ticketIds; // list of tickets bought with this ticket

  // setters and getters

}

 public class Wrapper{

   private Map ticketsCalculation;
   private List<PurchasedTicket> purchasedTickets;

  // setters and getters
}

模板部分表示的obj是Wrapper类的对象

Answer 1

只是为了让它编译：

1. 正如@rouge-one 提到的，您可以使用不同的变量名，例如。价值。

2. 您不应使用多个 @ 符号。正如docs 所说，它应该用在动态语句的开头，例如。 @for( ticket <- obj.getPurchasedTickets() ) {

   所以工作代码应该是这样的：

   <tbody>
       @for(ticket <- obj.getPurchasedTickets()) {
           @for((key, value) <- obj.getTicketsCalculation()) {
               @if(key.equals(ticket.getTicketId())) {
                   <tr>
                       <td class="desc">@ticket.getTicketName()<br></br>
                           @if(ticket.getTicketIds() != null && !ticket.getTicketIds().isEmpty()) {
                               @for(ticketid <- ticket.getTicketIds){
                                   #@ticketid
                               }
                           }
                       </td>
                       <td class="unit">@ticket.getPrice()</td>
                   </tr>
               }
           }
       }
   </tbody>
   

Answer 2

在模板的第 3 行将属性名称从 val 更改为 value，因为 val 是保留字。

 (key,value) <- @obj.getTicketsCalculation()

例如见下文

scala> val (key, value) =  "key1" -> "val1"
key: String = key1
value: String = val1

scala> val (key, value) = "key1" -> "val1" 键：字符串 = key1 值：字符串 = val1

scala> val (key, val) =  "key1" -> "val1"
<console>:1: error: illegal start of simple pattern
val (key, val) =  "key1" -> "val1"
          ^