类型变化

src/main/java/com/izouma/dingdong/dto/MerchantDTO.java

@@ -161,6 +161,6 @@ public class MerchantDTO {
     private BigDecimal startingAmount;
 
     @ApiModelProperty(value = "每餐准备时间")
-    private String preparationTime;
+    private Long preparationTime;
 
 }