el-from中嵌套el-table的表单验证

<el-table :data="form.detail">

        

            <el-table-column prop="merchant_id" label="商户名称">

              <template slot-scope="scope">

                <el-form-item style="margin-bottom:0px" :prop="'detail.'+scope.$index+'.merchant_id'" :rules="[{ required: true, message: '请输入商户名称', trigger: 'change' }]">

                  <el-select clearable filterable v-model="scope.row.merchant_id">

                    <el-option :value="item.merchant_id" :label="item.merchant_name" v-for="(item,index) in scope.row.merchanlist" :key="index"></el-option>

                  </el-select>

                </el-form-item>

              </template>

            </el-table-column>

</el-table>