Getting this error: An entry without a type name was found, but no expected type was specified

Question

I am new to sharepoint.I am getting below error on ajax call i dont know where it is occuring. "{\"error\":{\"code\":\"-1, Microsoft.SharePoint.Client.InvalidClientQueryException\",\"message\":{\"lang\":\"en-US\",\"value\":\" An entry without a type name was found, but no expected type was specified. To allow entries without type information, the expected type must also be specified when the model is specified.\"}}}"

The below is the code which I used Please reply as soon.

var camlQueryRequest = { query: { __metadata: { type: "SP.CamlQuery" }, ViewXml: "" } }; var CamlViewXml = "A150434";

var query = new Query();
    var camlquerybuild;
    query.SPSiteUrl = _spPageContextInfo.webAbsoluteUrl;
    query.QueryType = "CAML";
    query.RequestMethod = "POST";
    query.RequestHeaders = {
        "accept": "application/json;odata=verbose",
        "X-RequestDigest": $("#__REQUESTDIGEST").val(),
        "X-HTTP-Method": "POST",
        "content-length": 0,
        "content-type": "application/json;odata=verbose",
        "If-Match": "*"
    };

    camlQueryRequest.query.ViewXml = CamlViewXml;
    camlquerybuild = camlQueryRequest;
    var camlquery = JSON.stringify(camlquerybuild);
    self.QueryData = camlquery;

   query.RequestHeaders["content-length"] = self.QueryData.length;
   self.SearchUrl = query.SPSiteUrl + "/_api/web/lists/" + "getbytitle('RFA')/Items?$select=ID,ESI_ProjectSeqNoLookupId";
    $.ajax(
       {
           url: self.SearchUrl,
           method: query.RequestMethod,
           headers: query.RequestHeaders,
           data: self.QueryData,
           success: function (data) { deferredObject.resolve(data); },
           error: function (data) { deferredObject.reject(data); }
       });

Answer 1

I think this occurs due to missing Type attribute in List Item entry.

If you want to create list items using REST you will need to include the list item type.

The list item type is a string automatically created by SharePoint when the list is first created.

You can generate this value using the list name.

The syntax is : SP.Data.{ListName}ListItem.

So if the list name is MyList, list item type will be SP.Data.MyListListItem.

your code should look like :

"__metadata": { "type": "SP.Data.MyListListItem" }

Something like this should work :

var YourModel = {
    'Field1':'value1',
    'Field2':'value2',
    "__metadata": { "type": "SP.Data.MyListListItem" }
};
var YourSearchUrl = 'your_search_url';
$.ajax(
{
   url: YourSearchUrl,
   method: 'POST',
   headers: {
        "Accept": "application/json;odata=verbose",
        "X-RequestDigest": $("#__REQUESTDIGEST").val()
        "X-HTTP-Method": "POST",
        "content-type": "application/json;odata=verbose",
   },   
   data: JSON.stringify(YourModel),
   success: function (data) { 
    // Do something if success
   },
   error: function (data) { 
    // Do something if error
   }
});

In my SP 2013 webapp, I can create new list items using listdata.svc without having to specify the item type.

Answer 2

When making a POST request, __metadata attribute isn't required if aren't passing the Accept:"application/json;odata=nometadata" header. If you are passing in a verbose header you would need to specify the __metadata attribute.

Issue 5667