如何在 onInit 上获取模型? [英] How to get model on onInit?
问题描述
在 manifest.json 中，我有以下模型定义:
In manifest.json, I have following model definition:
{
"sap.ui5": {
"models": {
"SalesInvoices": {
"type": "sap.ui.model.odata.v2.ODataModel",
"settings": {
"defaultOperationMode": "Server",
"defaultCountMode": "Request"
},
"dataSource": "ZAM_SALES_STATISTICS_CDS",
"preload": true
}
}
}
}
如您所见，SalesInvoices 已连接到 OData 服务.
As you can see, SalesInvoices is connected to the OData service.
现在在控制器中的 onInit 函数上，我试图从 OData 获取 Metadata 如下:
Now on the onInit function in the controller, I am trying to get Metadata from OData as following:
{ // Controller
onInit: function() {
const oPayerModel = this.getView().getModel("SalesInvoices");
console.log(oPayerModel.getMetadata());
setTimeout(() => {
const oPayerModel = this.getView().getModel("SalesInvoices");
console.log(oPayerModel.getMetadata());
}, 600);
},
// ...
}
如您所见，我不得不延迟获取 OData 实例.setTimeout 不推荐在 SAPUI5 中使用，我怎样才能做得更好?
As you can see, I have to delay to get the OData instance.
setTimeout is not recommended to use in SAPUI5, how can I do it better?
推荐答案
你可以避免 setTimeout，如 在这个答案中提到，通过使用 API metadataLoaded 而不是它返回一个承诺.成功加载服务元数据后，即会履行承诺.
You can avoid setTimeout, as mentioned in this answer, by using the API metadataLoaded instead which returns a promise. The promise is fulfilled once the service metadata is loaded successfully.
onInit: async function() {
const oPayerModel = this.getOwnerComponent().getModel("SalesInvoices");
await oPayerModel.metadataLoaded();
const serviceMetadata = oPayerModel.getServiceMetadata(); // NOT .getMetadata()
// ...
},
关于在 onInit 中未定义模型，以下是更好解释的答案:
About the model being undefined in onInit, here are answers with better explanations:
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