Query MongoDb from C# - using Linq .Any() with predicate

Question

I have a collection I am trying to query using the c# driver. the document structure is:

{ 
    "_id" : 3121 , 
    "Active" : true , 
    "CategoryId" : 1 , 
    "Crci" : "IH" , 
    "CultureId" :  null  , 
    "DateUpdated" : { 
            "$date" : 1381916923120
    } , 
    "Description" : "National Careers Service: Actuary" , 
    "Keywords" : "" , 
    "MaxLevel" :  null  , 
    "MinLevel" :  null  , 
    "PhoneNumber" : "                    " , 
    "Priority" : 1 , 
    "Title" : "National Careers Service: Actuary" , 
    "WebUrl" : "https://nationalcareersservice.direct.gov.uk/advice/planning/jobprofiles/Pages/actuary.aspx" , 
    "CareerCultureExternalResources" : [ 
            { 
                    "CareerId" : 5 , 
                    "CultureId" : 1 , 
                    "DisplayOrder" : 1 , 
                    "ExternalResourceId" : 3121 , 
                    "Vgs" :  null 
            }
    ] , 
    "SubjectExternalResources" : [ ] , 
    "LifestyleCategories" :  null
}

the query I am trying to run is:

collection.AsQueryble().Where(
                er =>
                er.CareerCultureExternalResources.Any(
                    ccer => ccer.CareerId == request.CareerId && ccer.CultureId == request.CultureId));

passing the values careerId = 637 and cultureId = 1, I get the error: "Unsupported where clause: ((Int32)ccer.CareerId == 637)"

However on the MongoDb tutorials page it says this kind of query is covered: http://docs.mongodb.org/ecosystem/tutorial/use-linq-queries-with-csharp-driver/

I am using version 1.8.3 of the driver

Answer 1

Currently, using where and a conditional clause like you've done, when using Linq, is limited to a subset of .NET data types. Instead of using a short, use a Int32/(int) instead.