Details
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Bug
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Resolution: Fixed
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Major - P3
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2.10.4
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(copied to CRM)
Description
I'm trying to connect some framework that is based on IQueryable interface (i.e. OData if you wonder).
My current problem can be described using following snippet:
var queryable = database.GetCollection<MyItems>("myItems").AsQueryable(); |
var count1 = queryable.Select(x => x.Order.StateInfo).Count();
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// var count2 = queryable.Select(x => x.Order).Select(x => x.StateInfo).Count();
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This code works but if you uncomment the last line you get:
System.ArgumentException: Expression of type 'System.Collections.Generic.IEnumerable`1[MyApp.Common.Models.StateInfo]' |
cannot be used for parameter of type 'System.Linq.IQueryable`1[MyApp.Common.Models.StateInfo]' of method |
'Int32 Count[StateInfo](System.Linq.IQueryable`1[MyApp.Common.Models.StateInfo])' (Parameter 'arg0') |
at System.Dynamic.Utils.ExpressionUtils.ValidateOneArgument(MethodBase method, ExpressionType nodeKind, Expression arguments, ParameterInfo pi, String methodParamName, String argumentParamName, Int32 index)
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at System.Linq.Expressions.Expression.Call(MethodInfo method, Expression arg0)
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at System.Linq.Expressions.MethodCallExpression1.Rewrite(Expression instance, IReadOnlyList`1 args) |
at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)
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at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)
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at MongoDB.Driver.Linq.Processors.Transformer.Visit(Expression node)
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at MongoDB.Driver.Linq.Processors.Transformer.Transform(Expression node)
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at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Prepare(Expression expression) |
at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Translate(Expression expression) |
at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.ExecuteAsync[TResult](Expression expression, CancellationToken cancellationToken) |
at MongoDB.Driver.Linq.MongoQueryable.CountAsync[TSource](IMongoQueryable`1 source, CancellationToken cancellationToken) |
It seems that driver tries to perform some operations in-memory, dropping the whole `IQueryable` thing, so all the subsequent calls fail (like Select/Where/...). Query with two subsequent `Select`'s or `Select/Where` pair get efficiently poisoned and cannot be used anywhere. For example:
var queryable = database.GetCollection<MyItems>("myItems").AsQueryable(); |
var count1 = queryable.Select(x => x.Order).Where(x => x.StateInfo != null).Count(); |
// System.InvalidOperationException: '{document}.StateInfo is not supported.'
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