element-ui Cannot read properties of undefined (reading ‘name‘),data中写成集合的形式

     <el-form ref="ruleFormRef" style="max-width: 600px" :model="ruleForm" :rules="rules" label-width="auto"
            class="demo-ruleForm" :size="formSize" status-icon>
            <el-form-item label="Activity name" prop="name">
                <el-input v-model="ruleForm.name" />
            </el-form-item>
        </el-form>

    data() {
        return {
                ruleForm: [{
                        name: ''
                        }]
        }
}