Unhandled expression type: 'Default'

[colinblaise]

On .net core 5.0.102

I believe Sieve hasn't been updated to play nice with ef core 5, but I wanted to post this here to catalog the issue.

Receiving the following exception:

Sieve.Exceptions.SieveException: 'Unhandled expression type: 'Default'

Inner stack trace:

   at LinqKit.ExpressionVisitor.Visit(Expression exp)
   at LinqKit.ExpressionVisitor.VisitBinary(BinaryExpression b)
   at LinqKit.ExpressionVisitor.Visit(Expression exp)
   at LinqKit.ExpressionVisitor.VisitBinary(BinaryExpression b)
   at LinqKit.ExpressionVisitor.Visit(Expression exp)
   at LinqKit.ExpressionVisitor.VisitLambda(LambdaExpression lambda)
   at LinqKit.ExpressionVisitor.Visit(Expression exp)
   at LinqKit.ExpressionVisitor.VisitUnary(UnaryExpression u)
   at LinqKit.ExpressionVisitor.Visit(Expression exp)
   at LinqKit.ExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
   at LinqKit.ExpressionVisitor.VisitMethodCall(MethodCallExpression m)
   at LinqKit.ExpressionExpander.VisitMethodCall(MethodCallExpression m)
   at LinqKit.ExpressionVisitor.Visit(Expression exp)
   at LinqKit.Extensions.Expand(Expression expr)
   at LinqKit.ExpandableQueryProvider`1.System.Linq.IQueryProvider.CreateQuery[TElement](Expression expression)
   at Sieve.Services.SieveProcessor`3.ApplyFiltering[TEntity](TSieveModel model, IQueryable`1 result, Object[] dataForCustomMethods)
   at Sieve.Services.SieveProcessor`3.Apply[TEntity](TSieveModel model, IQueryable`1 source, Object[] dataForCustomMethods, Boolean applyFiltering, Boolean applySorting, Boolean applyPagination)

Error is thrown when calling sieveProcessor.Apply(sieveModel, q);

The query works just fine when I do not use sieveProcesor.

A quick Google shows that the error may be getting thrown here: https://github.com/scottksmith95/LINQKit/blob/master/src/LinqKit.Core/ExpressionVisitor.cs#L90

[TheoBP]

This only seems to happen when used in conjunction with AsExpandable() from LinQKit.