Question

我认为Breeze会自动进行缓存，但在我下面的简单测试中它不起作用。为实现这一目标还需要哪些其他设置？

var dataService = new breeze.DataService({
    serviceName: 'api',
    hasServerMetadata: false
});

var manager = new breeze.EntityManager({ dataService: dataService });
var metadataStore = manager.metadataStore;

console.log('before fetch', manager.getEntities());// returns [] as expected

var query = breeze.EntityQuery.from("ContentTypes");
manager.executeQuery(query).then(function(data) {
    console.log(data.results.length); // 3
    console.log('after fetch', manager.getEntities()); // still []. why???
});

Answer 1

在文档中进一步阅读后，我看到没有关于对象的元数据，Breeze will do no caching：

它们将是简单的JavaScript对象，而不是实体。 Breeze不会缓存它们，跟踪它们的变化，验证它们等等.Breeze只是作为一种HTTP检索机制而已，而不再是它。

以下是我的示例代码的更新（工作）版本：

var dataService = new breeze.DataService({
    serviceName: 'api',
    hasServerMetadata: false
});

var manager = new breeze.EntityManager({ dataService: dataService });
manager.metadataStore.addEntityType({
    shortName: "ContentType",
    namespace: "MyCompany.MyProduct.Models",
    autoGeneratedKeyType: breeze.AutoGeneratedKeyType.None,
    dataProperties: {
        Name: { dataType: breeze.DataType.String, maxLength: 30, isNullable: false, isPartOfKey: true },
        Description: { dataType: breeze.DataType.String, maxLength: 60, isNullable: false }
    }
});

//
// these lines are the same as before, but now they work because of the metadata
//
console.log('before fetch', manager.getEntities()); // returns [] as expected

var query = breeze.EntityQuery.from("ContentTypes");
manager.executeQuery(query).then(function(data) {
    console.log(data.results.length); // 3
    manager.addEntity(data.results[0]);
    console.log('after fetch', manager.getEntities()); // now it returns 3 entities
});

使缓存工作需要哪些微风设置？

1 个答案: