优化教师信息查询，新增用户角色静态常量类RoleConstants

src/main/java/com/teaching/backend/constant/RoleConstants.java

@@ -0,0 +1,7 @@
+package com.teaching.backend.constant;
+
+public class RoleConstants {
+    public static final Long TEACHER_ROLE = 1L;
+    public static final Long STUDENT_ROLE = 2L;
+    public static final Long ADMIN_ROLE = 3L;
+}

src/main/java/com/teaching/backend/controller/umsAdmin/UmsUserController.java

@@ -179,7 +179,7 @@ public class UmsUserController {
         return CommonResult.failed();
     }
 
-    @ApiOperation("获取教师信息列表，关联教师的username和name")
+    @ApiOperation("获取教师信息列表，关联教师的userId和name")
     @GetMapping("/get_teacherinf_list")
     public BaseResponse<List<TeacherInfVO>> getTeacherInfList(){
         List<TeacherInfVO>  teacherInfVO = umsUserService.getTeacherInfList();

src/main/java/com/teaching/backend/model/vo/courses/TeacherInfVO.java

@@ -12,8 +12,8 @@ public class TeacherInfVO {
     /**
      * 教师username
      */
-    @ApiModelProperty("教师username")
-    private String username;
+    @ApiModelProperty("教师userId")
+    private Long userId;
     /**
      * 课程封面
      */

src/main/java/com/teaching/backend/service/impl/courses/CoursesServiceImpl.java

@@ -42,6 +42,8 @@ import java.time.LocalDateTime;
 import java.util.*;
 import java.util.stream.Collectors;
 
+import static com.teaching.backend.constant.RoleConstants.TEACHER_ROLE;
+
 /**
  * <p>
  * 服务实现类

src/main/java/com/teaching/backend/service/umsAdmin/impl/UmsUserServiceImpl.java

@@ -42,6 +42,8 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
 
+import static com.teaching.backend.constant.RoleConstants.TEACHER_ROLE;
+
 @Service
 @Slf4j
 public class UmsUserServiceImpl extends ServiceImpl<UmsUserMapper, UmsUser> implements UmsUserService {
@@ -377,18 +379,17 @@ public class UmsUserServiceImpl extends ServiceImpl<UmsUserMapper, UmsUser> impl
         }
         throw new UsernameNotFoundException("用户名或密码错误");
     }
-
     @Override
     public List<TeacherInfVO> getTeacherInfList() {
-        List<UmsTeacher> umsTeachers = umsTeacherMapper.selectList(new LambdaQueryWrapper<UmsTeacher>());
+        List<UmsUser> umsUserTeachers = query().eq("role_id", TEACHER_ROLE).list();
         TeacherInfVO teacherInfVO = null;
-        List<TeacherInfVO> teacherInfList = new ArrayList<>();;
-        for (UmsTeacher umsTeacher : umsTeachers) {
+        List<TeacherInfVO> teacherInfList = new ArrayList<>();
+        for (UmsUser umsUserTeacher : umsUserTeachers) {
             teacherInfVO = new TeacherInfVO();
-            UmsUser umsUser = umsUserMapper.selectOne(new LambdaQueryWrapper<UmsUser>()
-                    .eq(UmsUser::getId, umsTeacher.getUserId()));
-            teacherInfVO.setName(umsTeacher.getName());
-            teacherInfVO.setUsername(umsUser.getUsername());
+            String teacherName = umsTeacherMapper.selectOne(new LambdaQueryWrapper<>(UmsTeacher.class)
+                    .eq(UmsTeacher::getUserId, umsUserTeacher.getId())).getName();
+            teacherInfVO.setName(teacherName);
+            teacherInfVO.setUserId(umsUserTeacher.getId());
             teacherInfList.add(teacherInfVO);
         }
         return teacherInfList;