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Type: Bug
Resolution: Unresolved
Priority: Unknown
Fix Version/s: None
Affects Version/s: 2.23.1
Component/s: LINQ3
Labels:
None

Assigned Teams:

Dotnet Drivers

Summary

When using a $set pipeline stage to set the value of a nested document, an ExpressionNotSupportedException is thrown.

MongoDB.Driver version: 2.23.1

MongoDB version: MongoDB 7.0.2 Community

How to Reproduce

static void Test2(IMongoCollection<MyDocument> collection)
{
    // Copy MyDocument.Value -> MyDocument.Nested.ValueCopy
    var update = Builders<MyDocument>.Update
        .Pipeline(new EmptyPipelineDefinition<MyDocument>()
            .Set(c => new MyDocument
            {
                Nested = new MyNestedDocument
                {
                    ValueCopy = c.Value,
                },
            }));
    collection.UpdateMany(Builders<MyDocument>.Filter.Empty, update); // throws ExpressionNotSupportedException
}

class MyDocument
{
    public int Id { get; set; }
    public string? Value { get; set; }
    public string? AnotherValue { get; set; }
    public MyNestedDocument? Nested { get; set; }
}
class MyNestedDocument
{
    public string? ValueCopy { get; set; }
}

Exception details:

MongoDB.Driver.Linq.ExpressionNotSupportedException
  HResult=0x80131515
  Message=Expression not supported: new MyNestedDocument() {ValueCopy = c.Value} because member and value serializers are not compatible.
  Source=MongoDB.Driver
  StackTrace:
   at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToSetStageTranslators.ExpressionToSetStageTranslator.ThrowIfMemberAndValueSerializersAreNotCompatible(Expression expression, IBsonSerializer memberSerializer, IBsonSerializer valueSerializer) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/Linq/Linq3Implementation/Translators/ExpressionToSetStageTranslators/ExpressionToSetStageTranslator.cs:line 176
   at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToSetStageTranslators.ExpressionToSetStageTranslator.CreateComputedField(TranslationContext context, IBsonDocumentSerializer documentSerializer, MemberInfo member, Expression valueExpression) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/Linq/Linq3Implementation/Translators/ExpressionToSetStageTranslators/ExpressionToSetStageTranslator.cs:line 157
   at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToSetStageTranslators.ExpressionToSetStageTranslator.TranslateNewWithOptionalMemberInitializers(TranslationContext context, IBsonDocumentSerializer documentSerializer, MemberInitExpression memberInitExpression) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/Linq/Linq3Implementation/Translators/ExpressionToSetStageTranslators/ExpressionToSetStageTranslator.cs:line 131
   at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToSetStageTranslators.ExpressionToSetStageTranslator.Translate(TranslationContext context, IBsonSerializer inputSerializer, LambdaExpression expression) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/Linq/Linq3Implementation/Translators/ExpressionToSetStageTranslators/ExpressionToSetStageTranslator.cs:line 44
   at MongoDB.Driver.Linq.Linq3Implementation.LinqProviderAdapterV3.TranslateExpressionToSetStage[TDocument,TFields](Expression`1 expression, IBsonSerializer`1 documentSerializer, IBsonSerializerRegistry serializerRegistry) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/Linq/Linq3Implementation/LinqProviderAdapterV3.cs:line 190
   at MongoDB.Driver.ExpressionSetFieldDefinitions`2.Render(IBsonSerializer`1 documentSerializer, IBsonSerializerRegistry serializerRegistry, LinqProvider linqProvider) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/SetFieldDefinitions.cs:line 100
   at MongoDB.Driver.PipelineStageDefinitionBuilder.<>c__DisplayClass50_0`1.<Set>b__0(IBsonSerializer`1 inputSerializer, IBsonSerializerRegistry sr, LinqProvider linqProvider) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/PipelineStageDefinitionBuilder.cs:line 1531
   at MongoDB.Driver.DelegatedPipelineStageDefinition`2.Render(IBsonSerializer`1 inputSerializer, IBsonSerializerRegistry serializerRegistry, LinqProvider linqProvider) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/PipelineStageDefinition.cs:line 439
   at MongoDB.Driver.AppendedStagePipelineDefinition`3.Render(IBsonSerializer`1 inputSerializer, IBsonSerializerRegistry serializerRegistry, LinqProvider linqProvider) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/PipelineDefinitionBuilder.cs:line 1579
   at MongoDB.Driver.PipelineUpdateDefinition`1.Render(IBsonSerializer`1 documentSerializer, IBsonSerializerRegistry serializerRegistry, LinqProvider linqProvider) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/UpdateDefinition.cs:line 132
   at MongoDB.Driver.MongoCollectionImpl`1.ConvertWriteModelToWriteRequest(WriteModel`1 model, Int32 index) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/MongoCollectionImpl.cs:line 743
   at System.Linq.Enumerable.<SelectIterator>d__229`2.MoveNext() in /_/src/libraries/System.Linq/src/System/Linq/Select.cs:line 96
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) in /_/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/List.cs:line 85
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) in /_/src/libraries/System.Linq/src/System/Linq/ToCollection.cs:line 29
   at MongoDB.Driver.Core.Operations.BulkMixedWriteOperation..ctor(CollectionNamespace collectionNamespace, IEnumerable`1 requests, MessageEncoderSettings messageEncoderSettings) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver.Core/Core/Operations/BulkMixedWriteOperation.cs:line 61
   at MongoDB.Driver.MongoCollectionImpl`1.CreateBulkWriteOperation(IClientSessionHandle session, IEnumerable`1 requests, BulkWriteOptions options) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/MongoCollectionImpl.cs:line 897
   at MongoDB.Driver.MongoCollectionImpl`1.BulkWrite(IClientSessionHandle session, IEnumerable`1 requests, BulkWriteOptions options, CancellationToken cancellationToken) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/MongoCollectionImpl.cs:line 232
   at MongoDB.Driver.MongoCollectionImpl`1.<>c__DisplayClass30_0.<BulkWrite>b__0(IClientSessionHandle session) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/MongoCollectionImpl.cs:line 214
   at MongoDB.Driver.MongoCollectionImpl`1.UsingImplicitSession[TResult](Func`2 func, CancellationToken cancellationToken) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/MongoCollectionImpl.cs:line 1339
   at MongoDB.Driver.MongoCollectionImpl`1.BulkWrite(IEnumerable`1 requests, BulkWriteOptions options, CancellationToken cancellationToken) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/MongoCollectionImpl.cs:line 214
   at MongoDB.Driver.MongoCollectionBase`1.<>c__DisplayClass98_0.<UpdateMany>b__0(IEnumerable`1 requests, BulkWriteOptions bulkWriteOptions) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/MongoCollectionBase.cs:line 729
   at MongoDB.Driver.MongoCollectionBase`1.UpdateMany(FilterDefinition`1 filter, UpdateDefinition`1 update, UpdateOptions options, Func`3 bulkWrite) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/MongoCollectionBase.cs:line 760
   at MongoDB.Driver.MongoCollectionBase`1.UpdateMany(FilterDefinition`1 filter, UpdateDefinition`1 update, UpdateOptions options, CancellationToken cancellationToken) in /data/mci/1823813186d46f4153bdfc964eec49fd/mongo-csharp-driver/src/MongoDB.Driver/MongoCollectionBase.cs:line 729

Additional Background

The following works, since we are not dealing with a nested document:

static void Test(IMongoCollection<MyDocument> collection)
{
    // Copy MyDocument.Value -> MyDocument.AnotherValue
    var update = Builders<MyDocument>.Update
        .Pipeline(new EmptyPipelineDefinition<MyDocument>()
            .Set(c => new MyDocument
            {
                AnotherValue = c.Value,
            }));
    collection.UpdateMany(Builders<MyDocument>.Filter.Empty, update); // Works
}

The following works, and is what I'd expect the original method to be translated to:

static void Test3(IMongoCollection<MyDocument> collection)
{
    // Copy MyDocument.Value -> MyDocument.Nested.ValueCopy
    var update = Builders<MyDocument>.Update
        .Pipeline(new EmptyPipelineDefinition<MyDocument>()
            .AppendStage<MyDocument, MyDocument, MyDocument>(new BsonDocument
            {
                ["$set"] = new BsonDocument
                {
                    ["Nested"] = new BsonDocument
                    {
                        ["ValueCopy"] = "$Value",
                    },
                },
            }));
    collection.UpdateMany(Builders<MyDocument>.Filter.Empty, update); // Works
}

Details

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How to Reproduce

Additional Background

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