vue2.x 循环form表单项并验证必填项

做项目时遇到一个功能：对每个商品进行评价和必填项校验。

原型如如下：

最后实现方式是：

1. 循环每一个el-form-item，
2. 在el-form-item标签上加rules校验规则，
3. props根据索引动态绑定

相关代码如下:

<el-form :model="goodsRateObj" ref="goodsRateObj" inline>
        <div class="goods_item" v-for="(item,index) in goodsRateObj.tags" :key="item.skuId">
          <div class="goods">
            <img :src="item.goodsCover" >
            <span>{{ item.goodsName }}</span>
          </div>
          <el-form-item label="商品质量：" :prop="`tags[${index}].commodityScore`" :rules='rules1'>
            <el-rate v-model="item.commodityScore"></el-rate>
          </el-form-item>
          <el-form-item label="物流速度：" :prop="`tags[${index}].expressScore`" :rules="rules2">
            <el-rate v-model="item.expressScore"></el-rate>
          </el-form-item>
          <el-form-item label="服务态度：" :prop="`tags[${index}].serviceAttitude`" :rules="rules3">
            <el-rate v-model="item.serviceAttitude"></el-rate>
          </el-form-item>
          <el-form-item label="评价内容：" :prop="`tags[${index}].comment`" :rules="rules4">
            <el-input type="textarea" v-model="item.comment" maxlength="200" show-word-limit :autosize="{'minRows': 4}"></el-input>
          </el-form-item>
        </div>
      </el-form>

export default {
  data() {
    var validateZero = (rule, value, callback) => {
      if (value === 0) {
        callback(new Error('评分最低一颗星'))
      } else {
        callback()
      }
    }
    return {
      goodsRateObj: { tags: [{ commodityScore: '', expressScore: '', serviceAttitude: '', comment: '' }] },
      rules1: [
        { required: true, message: '请输入商品质量', trigger: 'change' },
        { validator: validateZero, trigger: 'change' }
      ],
      rules2: [
        { required: true, message: '请选择物流速度', trigger: 'change' },
        { validator: validateZero, trigger: 'change' }
      ],
      rules3: [
        { required: true, message: '请选择服务态度', trigger: 'change' },
        { validator: validateZero, trigger: 'change' }
      ],
      rules4: [{ required: true, message: '请输入评价内容', trigger: 'blur' }]
    }
  },
  mounted() {},
  methods: {
    submitFn() {
        this.$refs.goodsRateObj.validate((valid) => {
          if (valid) {
            console.log('提交')
          } else {
            return false
          }
        })
    }
  }
}