Question

我试图从新的REST API中检索多个数据，但我遇到了一个奇怪的问题。如果我在一个集合上使用 $ expand ，那么它就不起作用。

请求是：

GET [Oranization URL]/api/data/v8.0/accounts?$expand=contact_customer_accounts HTTP/1.1
Accept: application/json
Content-Type: application/json; charset=utf-8
OData-MaxVersion: 4.0
OData-Version: 4.0

回复：

{
"error": {
    "code": "",
    "message": "Expansion of navigation properties isn\u2019t supported on entity collections.",
    "innererror": {
        "message": "Expansion of navigation properties isn\u2019t supported on entity collections.",
        "type": "Microsoft.Crm.CrmHttpException",
        "stacktrace": "   at Microsoft.Crm.Extensibility.OData.CrmODataUtilities.ThrowIfSelectClauseHasNavigationProperty(SelectExpandClause selectExpandClause, Boolean isCalledFromEntitySet)\r\n   at Microsoft.Crm.Extensibility.OData.CrmODataServiceDataProvider.RetrieveEdmEntityCollection(CrmODataExecutionContext context, String entityCollectionName, ODataQueryOptions queryOptions)\r\n   at Microsoft.Crm.Extensibility.OData.EntityController.GetEntitySetInternal(String entitySetName, String castEntityName, CrmODataExecutionContext context, CrmEdmEntityObjectCollection crmEdmEntityObjectCollection, ODataQueryOptions queryOptions)\r\n   at Microsoft.Crm.Extensibility.OData.EntityController.GetEntitySet(String entitySetName)\r\n   at lambda_method(Closure , Object , Object[] )\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"
        }
    }
}

但如果我在一个实体上发出此请求，那么我会得到结果

[Organization URL]/api/data/v8.0/accounts(9761dd37-d1b6-e511-80d7-001dd8b71fde)?$expand=contact_customer_accounts

在先前版本的CRM（2011,2015）中，这完美地运作了。 MS有可能删除此功能吗？实际上，oData 4.0协议允许这种类型的查询

http://services.odata.org/v4/TripPinServiceRW/People?$expand=Trips

为什么MS不允许这样做？没有它，新的REST API就没用了。

Answer 1

即使我希望将其列在Microsoft Dynamics CRM Web API Limitations中，但它确实似乎是对当前实施的限制。

其他用户已经注意到it appears that the $expand clause only works when requesting data of a single record。

我已经创建了一个建议，该建议是作为2016年春季版CRM的一部分实现的：Web API: Implement $expand on collections：

我们在2016年春季发布的Dynamics CRM中启用了此功能。如果你要求扩展＆amp;在相关集合上选择响应将包含一个带有nextlink的空集合，然后您可以使用用于以编程方式请求每个相关页面。我们是积极研究如何在扩展上支持$ filter 采集。如果您的方案需要，那么请创建另一个因此我们可以相应地优先考虑它。

CRM 2016 oData扩展集合

1 个答案: