Merge branch '2021-04-09'

mec-biz/src/main/java/com/ym/mec/biz/service/impl/PracticeGroupServiceImpl.java

@@ -3381,6 +3381,8 @@ public class PracticeGroupServiceImpl extends BaseServiceImpl<Long, PracticeGrou
             throw new BizException("请设置加油包价格");
         }
 
+        practiceGroupBuyParams.setCoursesStartDate(practiceCourses.stream().min(Comparator.comparing(CourseSchedule::getStartClassTime)).get().getStartClassTime());
+        practiceGroupBuyParams.setCoursesExpireDate(practiceCourses.stream().max(Comparator.comparing(CourseSchedule::getEndClassTime)).get().getEndClassTime());
         practiceGroupBuyParams.setDrillTimesJson(drillTimesObject.toJSONString());
         practiceGroupBuyParams.setOrganId(sysUser.getOrganId());
         practiceGroupBuyParams.setSingleClassMinutes(practiceCourseMinutes);