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POError message with Entity Framework and Function Import
 

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  1. POError message with Entity Framework and Function Import
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    <p>I have a DB stored procedure that returns a float. The Stored proc does calculations of inputs and spits out a "Rating" based in the inputs. I was able to update the Model and perform a function import, but when I try and use the new function in Linq i get the following error.</p> <blockquote> <p>Function metadata used in DbFunctionExpression must allow composition. Non-composable functions or functions that include command text are not allowed in expressions.</p> </blockquote> <p>I have no idea what that means, and a Google search returned nothing.</p> <p>Relevant code follows:</p> <pre><code>public static class EntityFunctions { [EdmFunction("RateMyNeighborhoodModel.Store","RMNIndex")] public static decimal? RMNIndex ( float Unemployment, float AverageCommuteTime, float FamiliesBelowPoverty, float TotalCrime, float PersonalCrime, float Murder, float Rape, float Robbery, float Assault, float PropertyCrime, float Burgulary, float Larceny, float VehicleTheft, float SexOffenderCount ) { throw new NotSupportedException(); } } var neighborhoodViews = (from nv in db.NeighborhoodViews join n in db.Neighborhoods.Include("ZipCodeStatistic") on nv.NeighborhoodID equals n.NeighborhoodID where EntityFunctions.RMNIndex((float)n.UnemploymentRate, (float)nv.AverageCommuteTime, (float)nv.familiesBelowPoverty, (float)nv.TotalCrime, (float)nv.PersonalCrime, (float)nv.Murder, (float)nv.Rape, (float)nv.Robbery, (float)nv.Assault, (float)nv.PropertyCrime, (float)nv.Burgulary, (float)nv.Larceny, (float)nv.VehicleTheft, (float)n.ZipCodeStatistic.SexOffenders) &gt; 4 orderby Guid.NewGuid() select new { City = n.City, GeographyData = nv.Geography, ID = n.NeighborhoodID, Latitude = Single.Parse(nv.Center.Replace("POINT (", "").Replace(")", "").Split(' ')[1]), Longitude = Single.Parse(nv.Center.Replace("POINT (", "").Replace(")", "").Split(' ')[0]), Name = n.Name, State = n.State, UpdateDate = n.UpdateDate, RMNIndex = EntityFunctions.RMNIndex((float)n.UnemploymentRate, (float)nv.AverageCommuteTime, (float)nv.familiesBelowPoverty, (float)nv.TotalCrime, (float)nv.PersonalCrime, (float)nv.Murder, (float)nv.Rape, (float)nv.Robbery, (float)nv.Assault, (float)nv.PropertyCrime, (float)nv.Burgulary, (float)nv.Larceny, (float)nv.VehicleTheft, (float)n.ZipCodeStatistic.SexOffenders), Zipcode = n.ZipCodeStatistic.ZipCode, TotalCrime = (double)n.ZipCodeStatistic.TotalCrime, PersonalCrime = (double)n.ZipCodeStatistic.PersonalCrime, Murder = (double)n.ZipCodeStatistic.Murder, Rape = (double)n.ZipCodeStatistic.Rape, Robbery = (double)n.ZipCodeStatistic.Robbery, Assault = (double)n.ZipCodeStatistic.Assault, PropertyCrime = (double)n.ZipCodeStatistic.PropertyCrime, Burgulary = (double)n.ZipCodeStatistic.Burgulary, Larceny = (double)n.ZipCodeStatistic.Larceny, VehicleTheft = (double)n.ZipCodeStatistic.VehicleTheft, AverageCommuteTime = (double)n.ZipCodeStatistic.AverageCommuteTime, UnemploymentRate = (double)n.ZipCodeStatistic.UnemploymentRate, FamiliesBelowPoverty = (double)nv.familiesBelowPoverty, SexOffenderCount = (int)n.ZipCodeStatistic.SexOffenders }).Take(5); </code></pre>
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    1. USJames Helms
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    1. This table or related slice is empty.
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      1. POError message with Entity Framework and Function Import
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      1. POError message with Entity Framework and Function Import
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    1. CODo you have the IsComposable attribute set to true for this function in your model?
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    2. CONo I don't. In the examples online I didn't see that as an option. I will try that when I get home.
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      1. USJames Helms
 

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