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@@ -113,9 +113,13 @@ public class BCoursePreServiceImpl extends ServiceImpl<BCoursePreMapper, BCourse
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public List<BUserPreDetailDto> getPreUserByCourse(String courseId, String preId) {
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List<BUserPreDetailDto> ss = new ArrayList<>();
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QueryWrapper<BUserPrePo> queryWrapper = new QueryWrapper<>();
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+ queryWrapper.select("distinct user_id");
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queryWrapper.eq("pre_id",preId);
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queryWrapper.eq("course_id",courseId);
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List<BUserPrePo> list = bUserPreMapper.selectList(queryWrapper);
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+ if(CollectionUtil.isEmpty(list)){
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+ return CollectionUtil.newArrayList();
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+ }
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List<String> userIdList = list.stream().map(BUserPrePo::getUserId).collect(Collectors.toList());
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QueryWrapper<WChatUserPo> queryWrapper1 = new QueryWrapper<>();
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