目标：创建班级管理模块（学生和班级、学院、学校关联起来）

一、后台三步走：

1、打开 projectName文件，在db/models目录下创建student.js文件

student.js文件代码如下：

const mongoose = require('mongoose')
const Schema = mongoose.Schema
const feld={
    name: String,
    age: Number,
    student_number:Number,
    gender:String,
    school : { type: Schema.Types.ObjectId, ref: 'School' },
    academy : { type: Schema.Types.ObjectId, ref: 'Academy' },
    classs : { type: Schema.Types.ObjectId, ref: 'Classs' }

}
//自动添加更新时间创建时间:
let personSchema = new mongoose.Schema(feld, {timestamps: {createdAt: 'created', updatedAt: 'updated'}})
module.exports= mongoose.model('Student',personSchema)

2、在projectName下的routes目录下，创建student.js文件

代码如下：

const router = require('koa-router')()
let Model = require("../db/models/student");
router.prefix('/student')

router.get('/', function (ctx, next) {
    ctx.body = 'this is a users response!'
})

router.post('/add', async function (ctx, next) {
    console.log(ctx.request.body)
    let model = new Model(ctx.request.body);
    model = await model.save();
    console.log('user',model)
    ctx.body = model
})

router.post('/find', async function (ctx, next) {
    let models = await Model.
    find({}).populate('classs').populate('academy').populate('school')
    ctx.body = models
})

router.post('/get', async function (ctx, next) {
    // let users = await User.
    // find({})
    console.log(ctx.request.body)
    let model = await Model.find(ctx.request.body)
    console.log(model)
    ctx.body = model
})

router.post('/update', async function (ctx, next) {
    console.log(ctx.request.body)
    let pbj = await Model.update({ _id: ctx.request.body._id }, ctx.request.body);
    ctx.body = pbj
})
router.post('/delete', async function (ctx, next) {
    console.log(ctx.request.body)
    await Model.remove({ _id: ctx.request.body._id });
    ctx.body = 'shibai '
})
module.exports = router

3、在app.js中挂载路由：

const classs= require('./routes/student')
app.use(student.routes(), student.allowedMethods())

二、前台三步走：

打开项目文件，在src/views目录下创建一个student模块，并在student目录下创建vue文件

1、editor.vue为编辑文件，用来创建学生记录

添加学生

代码如下：

<template>
  <div class="dashboard-container">
    <el-form ref="form" :model="form" label-width="80px">
      <el-form-item label="所属学校">
        <el-select v-model="form.school" placeholder="请选择" @change="schoolChange">
          <el-option
            v-for="item in schools"
            :key="item._id"
            :label="item.name"
            :value="item._id">
          </el-option>
        </el-select>
      </el-form-item>
      <!--      编辑框：学院选择列表-->
      <el-form-item label="所属学院">
        <el-select v-model="form.academy" placeholder="请选择">
          <el-option
            v-for="item in academys"
            :key="item._id"
            :label="item.name"
            :value="item._id">
          </el-option>
        </el-select>
      </el-form-item>

      <el-form-item label="所属班级">
        <el-select v-model="form.classs" placeholder="请选择">
          <el-option
            v-for="item in classs"
            :key="item._id"
            :label="item.name"
            :value="item._id">
          </el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="用户名">
        <el-input v-model="form.name"></el-input>
      </el-form-item>
      <el-form-item label="年龄">
        <el-input v-model="form.age"></el-input>
      </el-form-item>
      <el-form-item label="学号">
        <el-input v-model="form.student_number"></el-input>
      </el-form-item>
      <el-form-item label="性别">
        <el-input v-model="form.gender"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="onSubmit">立即创建</el-button>
        <el-button>取消</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
  import { mapGetters } from 'vuex'

  export default {
    name: 'student',
    computed: {
      ...mapGetters([
        'name'
      ])
    },
    data(){
      return{
        schools:[],
        academys:[],
        classs:[],
        options: [
        ],
        apiModel:'student',
        form:{}
      }
    },
    methods:{
      onSubmit(){
        if(this.form._id){
          this.$http.post(`/api/${this.apiModel}/update`,this.form).then(res => {
            console.log('bar:', res)
            this.$router.push({path:this.apiModel})
            this.form={}
          })
        }else
        {
          this.$http.post('/api/'+this.apiModel+'/add',this.form).then(res => {
            console.log('bar:', res)
            this.$router.push({path:this.apiModel})
            this.form={}
          })
        }
      },
      schoolChange(val1){
        //显示学院选择栏目
        this.$http.post('/api/academy/get',{school:val1}).then(res => {
          if(res&&res.length>0){
            this.academys = res
            console.log('res:', res)
          }
        })
      }
    },

    mounted() {
      if(this.$route.query._id){
        this.$http.post('/api/'+this.apiModel+'/get',{_id:this.$route.query._id}).then(res => {
          if(res&&res.length>0){
            this.form = res[0]
            this.schoolChange(this.form.school)
          }
        })
      }

      //显示学校选择栏目
      this.$http.post('/api/school/find').then(res => {
        if(res&&res.length>0){
          this.schools = res
          console.log('res:', res)
        }
      })
      //显示班级栏目
      this.$http.post('/api/classs/find').then(res => {
        if(res&&res.length>0){
          this.classs = res
          console.log('res:', res)
        }
      })
    }
  }
</script>

<style lang="scss" scoped>
  .dashboard {
    &-container {
      margin: 30px;
    }
    &-text {
      font-size: 30px;
      line-height: 46px;
    }
  }
</style>

2、index.vue为目录文件，用来显示结果
代码如下：

<template>
  <div class="dashboard-container">
    <el-table
      :data="users"
      style="width: 100%"
      :row-class-name="tableRowClassName">
      <el-table-column
        prop="name"
        label="名字"
        width="180">
      </el-table-column>
      <el-table-column
        prop="age"
        label="年龄"
        width="180">
      </el-table-column>
      <el-table-column
        prop="student_number"
        label="学号">
      </el-table-column>
      <el-table-column
        prop="gender"
        label="性别">
      </el-table-column>
      <!--      列表添加项目
-->
      <el-table-column
        prop="school"
        label="学校名称"
        width="180">
        <template slot-scope="scope" >
          <span class="" v-if="scope.row.school">
            <el-tag
              :type="scope.row.school.name === '深圳信息职业技术学院' ? 'primary' : 'success'"
              disable-transitions>{{scope.row.school.name}}</el-tag>
          </span>
        </template>
      </el-table-column>
      <el-table-column
        prop="academy"
        label="学院名称"
        width="180">
        <template slot-scope="scope" >
          <span class="" v-if="scope.row.academy">
            <el-tag
              :type="scope.row.academy.name === '软件学院' ? 'primary' : 'success'"
              disable-transitions>{{scope.row.academy.name}}</el-tag>
          </span>

        </template>
      </el-table-column>

      <el-table-column
        prop="classs"
        label="班级名称"
        width="180">
        <template slot-scope="scope" >
          <span class="" v-if="scope.row.classs">
            <el-tag
              :type="scope.row.classs.name === '18软工4-3' ? 'primary' : 'success'"
              disable-transitions>{{scope.row.classs.name}}</el-tag>
          </span>

        </template>
      </el-table-column>

      <el-table-column label="操作">
        <template slot-scope="scope">
          <el-button
            size="mini"
            @click="handleEdit(scope.$index, scope.row)">编辑
          </el-button>
          <el-button
            size="mini"
            type="danger"
            @click="handleDelete(scope.$index, scope.row)">删除
          </el-button>
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
  import { mapGetters } from 'vuex'

  export default {
    name: 'student',
    computed: {
      ...mapGetters([
        'name'
      ])
    },
    data() {
      return {
        apiModel:'student',
        users: {}
      }
    },
    methods: {
      onSubmit() {
        console.log(123434)
      },
      handleEdit(index, item) {
        this.$router.push({ path: '/'+this.apiModel+'/editor', query: {_id:item._id} })
      },
      handleDelete(index, item) {
        this.$http.post('/api/'+this.apiModel+'/delete', item).then(res => {
          console.log('res:', res)
          this.findUser()
        })

      },
      findUser(){
        this.$http.post('/api/'+this.apiModel+'/find', this.user).then(res => {
          console.log('res:', res)
          this.users = res
        })
      }
    },
    mounted() {
      this.findUser()
    }
  }
</script>

<style lang="scss" scoped>
  .dashboard {
    &-container {
      margin: 30px;
    }

    &-text {
      font-size: 30px;
      line-height: 46px;
    }
  }
</style>

3、在index.js中添加路由

代码如下：

 {
    path: '/student',
    component: Layout,
    meta: { title: '学生管理', icon: 'example' },
    redirect: '/student',
    children: [{
      path: 'student',
      name: 'student',
      component: () => import('@/views/student/index'),
      meta: { title: '学生管理', icon: 'user' }
    },
      {
        path: 'editor',
        name: 'editor',
        component: () => import('@/views/student/editor'),
        meta: { title: '添加学生', icon: 'user' }
      }]
  },