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65 lines
1.8 KiB
65 lines
1.8 KiB
6 months ago
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---
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title: 模型元数据
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---
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在 [元数据表单定义](../annotations-form.md) 我们介绍了如何为模型添加元数据表单，此文档将介绍如何在主题模板中使用元数据。
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我们在模板中专门为获取 annotations 数据提供了三个方法，可以更加方便的设置默认值和判断元数据字段是否存在。
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## #annotations.get(extension,key)
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### 描述
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根据对象和元数据的 key 获取元数据的值。
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### 示例
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```html {4}
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<div th:with="menu = ${menuFinder.getPrimary()}">
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<ul th:with="menuItems = ${menu.menuItems}">
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<li th:each="menuItem : ${menuItems}">
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<i th:class="${#annotations.get(menuItem, 'icon')}"></i>
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<a th:href="@{${menuItem.status.href}}" th:text="${menuItem.status.displayName}"></a>
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</li>
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</ul>
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</div>
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```
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## #annotations.getOrDefault(extension,key,defaultValue)
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### 描述
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根据对象和元数据的 key 获取元数据的值，同时支持设置默认值。
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### 示例
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```html {4}
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<div th:with="menu = ${menuFinder.getPrimary()}">
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<ul th:with="menuItems = ${menu.menuItems}">
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<li th:each="menuItem : ${menuItems}">
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<i th:class="${#annotations.getOrDefault(menuItem, 'icon', 'fa')}"></i>
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<a th:href="@{${menuItem.status.href}}" th:text="${menuItem.status.displayName}"></a>
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</li>
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</ul>
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</div>
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```
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## #annotations.contains(extension,key)
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### 描述
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根据对象和元数据的 key 判断元数据是否存在。
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### 示例
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```html {4}
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<div th:with="menu = ${menuFinder.getPrimary()}">
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<ul th:with="menuItems = ${menu.menuItems}">
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<li th:each="menuItem : ${menuItems}">
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<i th:if="${#annotations.contains(menuItem, 'icon')}" th:class="${#annotations.get(menuItem, 'icon')}"></i>
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<a th:href="@{${menuItem.status.href}}" th:text="${menuItem.status.displayName}"></a>
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</li>
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</ul>
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</div>
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```
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