RESTier OData 函数返回 EntitySet。 "The related entity set could not be found from the OData path"

Question

在 RESTier OData 上添加了一个函数

var ambilLocationsByMarketId = new EdmAction(ns, "AmbilLocationsByMarketId", location.GetEdmTypeReference(true), false, null);
model.AddElement(ambilLocationsByMarketId);
var entityContainer = (EdmEntityContainer)model.EntityContainer;
entityContainer.AddActionImport("AmbilLocationsByMarketId", ambilLocationsByMarketId);

在我的 DomainController 中实现了自定义函数

[HttpGet]
[EnableQuery]
[ODataRoute("AmbilLocationsByMarketId")]
public IHttpActionResult AmbilLocationsByMarketId()
{
    var locations = DbContext.Locations.Where(l => l.Name.Contains("Hotel")).Select(l => l);
    return Ok(locations);
}

但我一直在 return

中得到这个结果

{
  "error": {
    "code": "",
    "message": "An error has occurred.",
    "innererror": {
      "message": "The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; odata.metadata=minimal'.",
      "type": "System.InvalidOperationException",
      "stacktrace": "",
      "internalexception": {
        "message": "The related entity set could not be found from the OData path. The related entity set is required to serialize the payload.",
        "type": "System.Runtime.Serialization.SerializationException",
        "stacktrace": "   at System.Web.OData.Formatter.Serialization.ODataFeedSerializer.WriteObject(Object graph, Type type, ODataMessageWriter messageWriter, ODataSerializerContext writeContext)\\r\\n   at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content, HttpContentHeaders contentHeaders)\\r\\n   at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, 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.GetResult()\\r\\n   at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__1b.MoveNext()"
      }
    }
  }
}

如何在 RESTier 上分配正确的 return EntitySet 集合？我想 return 对象列表/ IQueryable

Answer 1

您需要修改两个地方才能使其正常工作：

1)声明动作时需要添加collectionreturn类型

2) 添加ActionImport时需要添加EdmEntitySetReferenceExpression。

请参阅 https://github.com/OData/RESTier/blob/master/test/ODataEndToEndTests/Microsoft.Restier.WebApi.Test.Services.Trippin/Domain/TrippinDomain.cs#L177-L189 示例（虽然它是 FunctionImport，但也应该适用于 ActionImport）。

RESTier OData 函数返回 EntitySet。 "The related entity set could not be found from the OData path"

RESTier OData Function returning EntitySet. "The related entity set could not be found from the OData path"

asp.net-mvc

odata

restier