Convert filtering field type to database field type

[mihaigliga21]

Is your feature request related to a problem?

Context

If DTO and database entity field has different type, filtering by this field throws error as it's expression is invalid.

For example having this database entity:

public class CharacterEntity
{
    public int Id { get; set; }
    public string Name { get; set; }
    public double Height { get; set; }
    public string Status { get; set; }
}

and the corresponding DTO

public class Character
{
    public int Id { get; set; }
    public string Name { get; set; }
    public double Height { get; set; }
    public Status Status { get; set; }
}

for field Status we have different type in database (as String) and in DTO (as Enum), accordingly in GraphQL schema we will also gonna have a type Enum for this field.

public enum Status
{
    Alive,
    Dead,
    Unknown
}

Filtering and Projection works just fine as fare client doesn't try to filter by Status, the generated query expression is going to compare an db.Character.Status(String) == request.Status(Enum) which obviously is invalid.

query{
  characters (
    where: {
      status: {
        eq: ALIVE
      }
    }
  ){
    nodes {
      id
      name
      height
      status
    }
  }
}

Log output

{
  "errors": [
    {
      "message": "Unexpected Execution Error",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "characters"
      ],
      "extensions": {
        "message": "The LINQ expression 'DbSet<CharacterEntity>()\r\n    .Where(c => Enum.Parse<Status>(c.Status) == __p_0)' could not be translated. Additional information: Translation of method 'System.Enum.Parse' failed. If this method can be mapped to your custom function, see https://go.microsoft.com/fwlink/?linkid=2132413 for more information. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. See https://go.microsoft.com/fwlink/?linkid=2101038 for more information.",
        "stackTrace": "   at Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslatingExpressionVisitor.<VisitMethodCall>g__CheckTranslated|15_0(ShapedQueryExpression translated, <>c__DisplayClass15_0& )\r\n   at Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)\r\n   at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)\r\n   at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)\r\n   at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at Microsoft.EntityFrameworkCore.Query.QueryCompilationContext.CreateQueryExecutor[TResult](Expression query)\r\n   at Microsoft.EntityFrameworkCore.Storage.Database.CompileQuery[TResult](Expression query, Boolean async)\r\n   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.CompileQueryCore[TResult](IDatabase database, Expression query, IModel model, Boolean async)\r\n   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass12_0`1.<ExecuteAsync>b__0()\r\n   at Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOrAddQuery[TResult](Object cacheKey, Func`1 compiler)\r\n   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExecuteAsync[TResult](Expression query, CancellationToken cancellationToken)\r\n   at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.ExecuteAsync[TResult](Expression expression, CancellationToken cancellationToken)\r\n   at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable`1.GetAsyncEnumerator(CancellationToken cancellationToken)\r\n   at System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable`1.GetAsyncEnumerator()\r\n   at HotChocolate.Types.Pagination.QueryableCursorPagination`1.ExecuteAsync(IQueryable`1 query, Int32 offset, CancellationToken cancellationToken)\r\n   at HotChocolate.Types.Pagination.CursorPaginationAlgorithm`2.ApplyPaginationAsync(TQuery query, CursorPagingArguments arguments, Nullable`1 totalCount, CancellationToken cancellationToken)\r\n   at HotChocolate.Types.Pagination.QueryableCursorPagingHandler`1.ResolveAsync(IResolverContext context, IQueryable`1 source, CursorPagingArguments arguments, CancellationToken cancellationToken)\r\n   at HotChocolate.Types.Pagination.CursorPagingHandler.HotChocolate.Types.Pagination.IPagingHandler.SliceAsync(IResolverContext context, Object source)\r\n   at HotChocolate.Types.Pagination.PagingMiddleware.InvokeAsync(IMiddlewareContext context)\r\n   at HotChocolate.Utilities.MiddlewareCompiler`1.ExpressionHelper.AwaitTaskHelper(Task task)\r\n   at HotChocolate.Execution.Processing.Tasks.ResolverTask.ExecuteResolverPipelineAsync(CancellationToken cancellationToken)\r\n   at HotChocolate.Execution.Processing.Tasks.ResolverTask.TryExecuteAsync(CancellationToken cancellationToken)"
      }
    }
  ],
  "data": {
    "characters": null
  }
}

Version
12.13.2

The solution you'd like

It's possible to have something like an field conversion before building the filter expression?

Product

Hot Chocolate