group by问题 和 剧集为空的问题

src/main/java/com/sqx/modules/course/service/impl/CourseCollectServiceImpl.java

@@ -148,6 +148,9 @@ public class CourseCollectServiceImpl extends ServiceImpl<CourseCollectDao, Cour
         //详情id
         Set<Long> courseDetailIds = new HashSet<>();
         courses.forEach(s -> {
+            if (s == null) {
+                return;
+            }
             courseIdList.add(s.getCourseId());
             courseDetailIds.add(s.getCourseDetailsId());
         });
@@ -157,7 +160,7 @@ public class CourseCollectServiceImpl extends ServiceImpl<CourseCollectDao, Cour
         List<CourseDetails> courseDetails1 = courseIdList.isEmpty() ? new ArrayList<>() :
                 courseDetailsService.list(new LambdaQueryWrapper<CourseDetails>().in(CourseDetails::getCourseDetailsId, courseDetailIds));
         Map<Long, CourseDetails> courseDetailsMap = courseDetails1.stream().collect(Collectors.toMap(CourseDetails::getCourseId, item -> item));
-        List<CourseDetails> courseDetails2 = courseDetailsDao.countByCourseId(courseIdList);
+        List<CourseDetails> courseDetails2 = courseIdList.isEmpty() ? new ArrayList<>() : courseDetailsDao.countByCourseId(courseIdList);
         Map<Long, Integer> countMap = courseDetails2.stream()
                 .collect(Collectors.toMap(CourseDetails::getCourseId, CourseDetails::getCourseDetailsCount));
 

src/main/resources/mapper/course/CourseCollectDao.xml

@@ -49,6 +49,7 @@
         FROM `course_collect` c1
         WHERE c1.classify = 3
           AND c1.user_id = #{userId}
+        group by c1.course_id
         order by c1.create_time desc
     </select>
 </mapper>

src/main/resources/mapper/course/CourseDetailsDao.xml

@@ -112,7 +112,6 @@
         <foreach collection="courseIdList" item="ids" open="(" separator="," close=")">
             #{ids}
         </foreach>
-        GROUP BY course_id
     </select>
 
 </mapper>