JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@1.3.5/lib/index.js"></script>
<div id="app">

<el-form :model="ruleForm" :rules="rules" ref="ruleForm" label-width="120px" class="demo-ruleForm">
  <div v-for="(item, index) in ruleForm.items" :key="index">
    <div class="col">
      <el-form-item label="Description" 
        :prop="'items.' + index + '.description'"
        :rules="{required: true, message: 'description is required', trigger: 'blur'}">
        <el-input v-model="item.description"></el-input>
      </el-form-item>
      <el-form-item label="Price" 
        :prop="'items.' + index + '.price'"
        :rules="{required: true, message: 'description is required', trigger: 'blur'}">
        <el-input v-model="item.price"></el-input>
      </el-form-item>
    </div>
  </div>  
</el-form>
<button @click="addRow">Add Row</button>
<br />
<br />
<button @click="submitForm('ruleForm')">Submit</button>
</div>

SCSS

@import url("//unpkg.com/element-ui@1.3.5/lib/theme-default/index.css");

Babel + JSX

var Main = {
    data() {
      return {
      	ruleForm: {
          items: [{
          	description: '',
            price: ''
          }]
        },
        rules: {
          /*description: { required: true, message: 'required', trigger: 'blur' },*/
          price: { required: true, message: 'required', trigger: 'blur' }
        }
      };
    },
    methods: {
      submitForm(formName) {
        this.$refs[formName].validate((valid) => {
          if (valid) {
            alert('submit!');
          } else {
            console.log('error submit!!');
            return false;
          }
        });
      },
      addRow() {
      	this.ruleForm.items.push({
        	description: '',
          price: ''
        })
      }
    }
  }
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')