vue下拉框属性说明

在谷粒学院的课程信息页面，添加课程讲师，需要加个下拉框，通过将后端查询到的讲师列表传递给前端

        <el-select
            v-model="courseInfo.teacherId"
            placeholder="请选择">
            
            <el-option
            v-for="teacher in teacherList"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"/>
        </el-select>
        </el-form-item>

需要解释一下，key属性是唯一标识，label是在前端显示的值，value是前端提交数据后，真正传给接口的字段值。这里将讲师名字在前端展示，选择讲师后，点击下一步，提交给后端的是讲师id，而不是讲师名字

在后端的mapper中定义的课程信息如下，可以看到定义的是teacherId

package com.atguigu.eduservice.entity;

import java.math.BigDecimal;

import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import java.util.Date;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import java.io.Serializable;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

/**
 * <p>
 * 课程
 * </p>
 *
 * @author testjava
 * @since 2022-04-19
 */
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@ApiModel(value="EduCourse对象", description="课程")
public class EduCourse implements Serializable {

    private static final long serialVersionUID = 1L;

    @ApiModelProperty(value = "课程ID")
    @TableId(value = "id", type = IdType.ID_WORKER_STR)
    private String id;

    @ApiModelProperty(value = "课程讲师ID")
    private String teacherId;

    @ApiModelProperty(value = "课程专业ID")
    private String subjectId;

    @ApiModelProperty(value = "课程专业父级ID")
    private String subjectParentId;

    @ApiModelProperty(value = "课程标题")
    private String title;

    @ApiModelProperty(value = "课程销售价格，设置为0则可免费观看")
    private BigDecimal price;

    @ApiModelProperty(value = "总课时")
    private Integer lessonNum;

    @ApiModelProperty(value = "课程封面图片路径")
    private String cover;

    @ApiModelProperty(value = "销售数量")
    private Long buyCount;

    @ApiModelProperty(value = "浏览数量")
    private Long viewCount;

    @ApiModelProperty(value = "乐观锁")
    private Long version;

    @ApiModelProperty(value = "课程状态 Draft未发布  Normal已发布")
    private String status;

    @ApiModelProperty(value = "逻辑删除 1（true）已删除， 0（false）未删除")
    private Integer isDeleted;

    @ApiModelProperty(value = "创建时间")
    @TableField(fill = FieldFill.INSERT)
    private Date gmtCreate;

    @ApiModelProperty(value = "更新时间")
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date gmtModified;


}

在讲师表对应的mapper中，既有name，也有id

package com.atguigu.eduservice.entity;

import com.baomidou.mybatisplus.annotation.*;

import java.util.Date;

import java.io.Serializable;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

/**
 * <p>
 * 讲师
 * </p>
 *
 * @author testjava
 * @since 2022-03-17
 */
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@ApiModel(value="EduTeacher对象", description="讲师")
public class EduTeacher implements Serializable {

    private static final long serialVersionUID = 1L;

    @ApiModelProperty(value = "讲师ID")
    @TableId(value = "id", type = IdType.ID_WORKER_STR)
    private String id;

    @ApiModelProperty(value = "讲师姓名")
    private String name;

    @ApiModelProperty(value = "讲师简介")
    private String intro;

    @ApiModelProperty(value = "讲师资历,一句话说明讲师")
    private String career;

    @ApiModelProperty(value = "头衔 1高级讲师 2首席讲师")
    private Integer level;

    @ApiModelProperty(value = "讲师头像")
    private String avatar;

    @ApiModelProperty(value = "排序")
    private Integer sort;

    @ApiModelProperty(value = "逻辑删除 1（true）已删除， 0（false）未删除")
    @TableLogic   //逻辑删除注解
    private Boolean isDeleted;

    @ApiModelProperty(value = "创建时间")
    @TableField(fill = FieldFill.INSERT)
    private Date gmtCreate;

    @ApiModelProperty(value = "更新时间")
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date gmtModified;


}

具体在前端处理的时候，先将查询到的teacher.name传递给label，如果前端要提交，再将该选中的讲师的id即teacher.id传给courseInfo中的teacherId
数据表edu_course中的teacher_id对应的是edu_teacher中的id