2021/11/1

问题1：delete 方法无法识别到ids

解决： 

问题2：idea(goland) 上传到gitee 步骤记录

1.项目setting->git->stash->create stash

 

2. 本地仓库下面查看项目分支

 3.对比修改的位置和代码

git->compare with branch ->选择分支

 

 4.commit 之前查看提交的内容和修改信息

commit ->commit - >push

 

 5.push

 学习记录点一：

多对多查询

需求：

        1.通过请求时传入的studentId去查询，当前学生被哪几位老师教。

        2.如法炮制，通过老师id查询教了哪几位学生

实现：

        1.model层：

// student info
type SysStudent struct {
	ms.M
	Sid      uint        `gorm:"sid" json:"sid"`
	Sname    string      `gorm:"sname" json:"sname"`
	ParentId uint        `gorm:"default:0;comment:'父菜单编号(编号为0时表示根菜单)'" json:"parentId"`
	Courses  []SysCourse `gorm:"foreignkey:StudentId;comment:'学生课程'" json:"courses"`
	Teachers []SysTeacher `gorm:"many2many:sys_student_teacher_relation;" json:"teachers"` // 学生老师多对多关系
	Children []SysStudent `gorm:"-" json:"children"`
}

// teacher info
type SysTeacher struct {
	ms.M
	Tnum		uint  `gorm:"comment:'工号'" json:"tnum"`
	Password     string  `gorm:"comment:'密码'" json:"password"`
	Tname      string `gorm:"tname" json:"sname"`
	CourseId       uint    `gorm:"comment:'角色Id外键'" json:"courseId"`
	Course        SysCourse `gorm:"foreignKey:StudentId" json:"course"` // 将SysUser.RoleId指定为外键
	Students   []SysStudent `gorm:"many2many:sys_student_teacher_relation;" json:"student"` // 教师学生多对多关系

}

// student relation teacher
type RelationStudentTeacher struct {
	SysStudentId uint `json:"sysStudentId"`
	SysTeacherId uint `json:"sysTeacherId"`
}

2.路由器

// 用户路由
func InitTeacherRouter(r *router.Router) {
	router1 := r.Casbin("/teacher")
	router2 := r.Idempotence("/teacher")
	//router1.POST("/info", v1.GetTeacherInfo)
	router1.GET("/list", v1.GetTeachers)
	router2.POST("/create", v1.CreateTeacher)
	router1.PATCH("/update/:studentId", v1.UpdateTeacherById)
	router1.DELETE("/delete/batch", v1.BatchDeleteTeacherByIds)
	router1.GET("/all/:id", v1.FindAllStudentsByTeacherId)//find students by techerID
}

3.控制层

// find students by techer id
func FindAllStudentsByTeacherId(c *gin.Context) {
	var r request.StudentReq
	req.ShouldBind(c, &r)
	//id := req.UintId(c)
	s := service.New(c)
	students := s.FindStudentsByTeacherId(utils.Str2Uint(c.Param("id")))//service importe
	resp.SuccessWithData(students)
}

4.业务层

// find student by teacher id
func (my MysqlService) FindStudentsByTeacherId(teacher uint) []models.SysStudent {
	// query current student teacher relation
	studentIds := make([]uint, 0)
	my.Q.Tx.
		Model(&models.StudenttionTeacherStudent{}).
		Where("sys_teacher_id = ?", teacher).
		Pluck("sys_student_id", &studentIds)
	teachersStudent := make([]models.SysStudent, 0)
	if len(studentIds) > 0 {
		my.Q.Tx.
			Model(&models.SysStudent{}).
			Where("id IN (?)", studentIds).
			Find(&teachersStudent)
	}
	return teachersStudent
}