json - List<Object> serialization not working with multiple objects -

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i have following classes

[datacontract] public class video {     [key]     [datamember(isrequired = false)]     public int videoid { get; set; }      [datamember(isrequired = false)]     public int userid { get; set; }      [required]     [datamember ]     public string title { get; set; }      [required]     [datamember]     public virtual ilist<tag> tags { get; set; }  }  [datacontract] public class tag {     [key]     [required]     [datamember(isrequired = false)]     public int? tagid { get; set; }      [datamember(isrequired = true)]     [required]     public string name { get; set; }      [ignoredatamember]     public virtual ilist<video> videos { get; set; }  }

in webapi controller, call this: 

            var videos = _service.getvideos();             return request.createresponse(httpstatuscode.ok, videos);

which calls this: 

    public ilist<video> getvideos()     {         using (var db = createcontext())         {             return db.videos.include("tags").tolist();         }     }

yet on wire, get: 

 [{     "$id": "8",     "tags": [         {             // correct serialization             "$id": "9",               "tagid": 1,             "name": "example",             "count": 5         }     ],     "videoid": 18,     "userid": 3,     "title": "test video",     "thumbnail": "http://i.imgur.com/gv3j2uf.png",     "source": "test source" },  {     "$id": "19",     "tags": [         {             // wtf?             "$ref": "9"         }     ],     "videoid": 28,     "userid": 6,     "title": "test video",     "thumbnail": "http://i.imgur.com/gv3j2uf.png",     "source": "test source" }, {     "$id": "20",     "tags": [         {             // correct again             "$id": "21",             "tagid": 10,             "name": "funny",             "count": 2         }     ],     "videoid": 29,     "userid": 6,     "title": "test vid",     "thumbnail": "https://i.imgur.com/swoqsof.jpg",     "source": "test source" }, {     "$id": "22",     "tags": [         {             // incorrect             "$ref": "9"         },         {             "$ref": "21"         }     ],     "videoid": 30,     "userid": 6,     "title": "test vid",     "thumbnail": "https://i.imgur.com/r7lvobx.jpg",     "source": "test source" }

for reason - tags serializing correctly, , not. idea i'm doing wrong?

you have circular references in object graph. cannot json serialized properly, serializer detects condition , automatically makes references ($ref). when loading object graph using ef there circular references between objects in memory cannot represented correctly in json.

i recommend breaking circular references graph using view model , sending view model on wire instead of directly returning autogenerated ef models.


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