6

我正在尝试从新的 REST API 检索多个数据,但我遇到了一个奇怪的问题。如果我在集合上使用$expand则它不起作用。

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

和回应:

{
"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()"
        }
    }
}

但是,如果我对单个实体提出此请求,那么我会得到结果

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

在以前的 CRM 版本(2011,2015)中,这可以完美运行。MS是否有可能删除此功能?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不允许它?没有这个,新的 REST API 将毫无用处。

4

1 回答 1

8

尽管我希望这会在Microsoft Dynamics CRM Web API 限制中列出,但它确实似乎是当前实施的限制。

像您一样,其他用户已经注意到$expand 子句似乎仅在请求单个记录的数据时才有效

我创建了一个建议,该建议作为 2016 年春季 CRM 版本的一部分实施:Web API:在集合上实施 $expand

我们在 Dynamics CRM 的 2016 年春季版中启用了此功能。如果您在相关集合上请求展开和选择,则响应将包含一个带有下一个链接的空集合,然后您可以使用该链接以编程方式请求每个相关页面。我们正在积极研究如何在扩展集合上支持 $filter。如果您的场景需要,请创建另一个想法,以便我们可以相应地优先考虑它。

于 2016-01-12T11:53:35.077 回答