线上课-学员返回学员的第一次学习时间

src/main/java/xyz/playedu/api/controller/backend/CourseUserController.java

@@ -34,7 +34,7 @@ import xyz.playedu.api.service.UserCourseHourRecordService;
 import xyz.playedu.api.service.UserCourseRecordService;
 import xyz.playedu.api.service.UserService;
 import xyz.playedu.api.types.JsonResponse;
-import xyz.playedu.api.types.mapper.UserCourseHourRecordUserCountMapper;
+import xyz.playedu.api.types.mapper.UserCourseHourRecordUserFirstCreatedAtMapper;
 import xyz.playedu.api.types.paginate.PaginationResult;
 import xyz.playedu.api.types.paginate.UserPaginateFilter;
 
@@ -110,14 +110,15 @@ public class CourseUserController {
                         .stream()
                         .collect(Collectors.toMap(UserCourseRecord::getUserId, e -> e)));
         data.put(
-                "user_course_hour_user_count",
+                "user_course_hour_user_first_at",
                 userCourseHourRecordService
-                        .getUserCourseHourUserCount(courseId, userIds, null)
+                        .getUserCourseHourUserFirstCreatedAt(courseId, userIds)
                         .stream()
                         .collect(
                                 Collectors.toMap(
-                                        UserCourseHourRecordUserCountMapper::getUserId,
+                                        UserCourseHourRecordUserFirstCreatedAtMapper::getUserId,
-                                        UserCourseHourRecordUserCountMapper::getTotal)));
+                                        UserCourseHourRecordUserFirstCreatedAtMapper
+                                                ::getCreatedAt)));
         data.put("course", courseService.findOrFail(courseId));
 
         return JsonResponse.data(data);

src/main/java/xyz/playedu/api/mapper/UserCourseHourRecordMapper.java

@@ -22,6 +22,7 @@ import org.apache.ibatis.annotations.Mapper;
 import xyz.playedu.api.domain.UserCourseHourRecord;
 import xyz.playedu.api.types.mapper.UserCourseHourRecordCourseCountMapper;
 import xyz.playedu.api.types.mapper.UserCourseHourRecordUserCountMapper;
+import xyz.playedu.api.types.mapper.UserCourseHourRecordUserFirstCreatedAtMapper;
 import xyz.playedu.api.types.paginate.UserCourseHourRecordPaginateFilter;
 
 import java.util.List;
@@ -41,6 +42,9 @@ public interface UserCourseHourRecordMapper extends BaseMapper<UserCourseHourRec
     List<UserCourseHourRecordUserCountMapper> getUserCourseHourUserCount(
             Integer courseId, List<Integer> userIds, Integer isFinished);
 
+    List<UserCourseHourRecordUserFirstCreatedAtMapper> getUserCourseHourUserFirstCreatedAt(
+            Integer courseId, List<Integer> userIds);
+
     List<UserCourseHourRecord> paginate(UserCourseHourRecordPaginateFilter filter);
 
     Long paginateCount(UserCourseHourRecordPaginateFilter filter);

src/main/java/xyz/playedu/api/service/UserCourseHourRecordService.java

@@ -20,6 +20,7 @@ import com.baomidou.mybatisplus.extension.service.IService;
 import xyz.playedu.api.domain.UserCourseHourRecord;
 import xyz.playedu.api.types.mapper.UserCourseHourRecordCourseCountMapper;
 import xyz.playedu.api.types.mapper.UserCourseHourRecordUserCountMapper;
+import xyz.playedu.api.types.mapper.UserCourseHourRecordUserFirstCreatedAtMapper;
 import xyz.playedu.api.types.paginate.PaginationResult;
 import xyz.playedu.api.types.paginate.UserCourseHourRecordPaginateFilter;
 
@@ -58,6 +59,9 @@ public interface UserCourseHourRecordService extends IService<UserCourseHourReco
     List<UserCourseHourRecordUserCountMapper> getUserCourseHourUserCount(
             Integer courseId, List<Integer> userIds, Integer isFinished);
 
+    List<UserCourseHourRecordUserFirstCreatedAtMapper> getUserCourseHourUserFirstCreatedAt(
+            Integer courseId, List<Integer> userIds);
+
     PaginationResult<UserCourseHourRecord> paginate(
             int page, int size, UserCourseHourRecordPaginateFilter filter);
 }

src/main/java/xyz/playedu/api/service/impl/UserCourseHourRecordServiceImpl.java

@@ -27,6 +27,7 @@ import xyz.playedu.api.mapper.UserCourseHourRecordMapper;
 import xyz.playedu.api.service.UserCourseHourRecordService;
 import xyz.playedu.api.types.mapper.UserCourseHourRecordCourseCountMapper;
 import xyz.playedu.api.types.mapper.UserCourseHourRecordUserCountMapper;
+import xyz.playedu.api.types.mapper.UserCourseHourRecordUserFirstCreatedAtMapper;
 import xyz.playedu.api.types.paginate.PaginationResult;
 import xyz.playedu.api.types.paginate.UserCourseHourRecordPaginateFilter;
 
@@ -172,4 +173,13 @@ public class UserCourseHourRecordServiceImpl
                         .eq("course_id", courseId)
                         .eq("hour_id", hourId));
     }
+
+    @Override
+    public List<UserCourseHourRecordUserFirstCreatedAtMapper> getUserCourseHourUserFirstCreatedAt(
+            Integer courseId, List<Integer> userIds) {
+        if (userIds == null || userIds.size() == 0) {
+            return new ArrayList<>();
+        }
+        return getBaseMapper().getUserCourseHourUserFirstCreatedAt(courseId, userIds);
+    }
 }

src/main/java/xyz/playedu/api/types/mapper/UserCourseHourRecordUserFirstCreatedAtMapper.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2023 杭州白书科技有限公司
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package xyz.playedu.api.types.mapper;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import lombok.Data;
+
+import java.util.Date;
+
+/**
+ * @Author 杭州白书科技有限公司
+ *
+ * @create 2023/5/8 14:42
+ */
+@Data
+public class UserCourseHourRecordUserFirstCreatedAtMapper {
+    @JsonProperty("user_id")
+    private Integer userId;
+
+    @JsonProperty("created_at")
+    private Date createdAt;
+}

src/main/resources/mapper/UserCourseHourRecordMapper.xml

@@ -128,4 +128,22 @@
         </if>
         GROUP BY `user_id`;
     </select>
+    <select id="getUserCourseHourUserFirstCreatedAt"
+            resultType="xyz.playedu.api.types.mapper.UserCourseHourRecordUserFirstCreatedAtMapper">
+        SELECT `t1`.`created_at`, `t1`.`user_id`
+        FROM `user_course_hour_records` AS `t1`
+        INNER JOIN (SELECT `t2`.`user_id`, min(`t2`.`created_at`) as `created_at`
+        FROM `user_course_hour_records` AS `t2`
+        WHERE `t2`.`course_id` = #{courseId}
+        <if test="userIds != null and #{userIds}.size() > 0">
+            AND `t2`.`user_id` IN (<foreach collection="userIds" item="userId" separator=",">#{userId}</foreach>)
+        </if>
+        GROUP BY `t2`.`user_id`) AS `t3`
+        ON `t3`.`user_id` = `t1`.`user_id`
+        AND `t3`.`created_at` = `t1`.`created_at`
+        WHERE `t1`.`course_id` = #{courseId}
+        <if test="userIds != null and #{userIds}.size() > 0">
+            AND `t1`.`user_id` IN (<foreach collection="userIds" item="userId" separator=",">#{userId}</foreach>)
+        </if>
+    </select>
 </mapper>