Unknown Queries using complex EF entities (entities that reference other entities) causes an exception. The problem doesn't happen when the entity only contains basic types.
Minimal reproducible project:
https://github.com/jonataspc/MongoDbEfProviderDemo
Basically I used the quick-start sample available on https://www.mongodb.com/docs/entity-framework/current/quick-start/ and added one additional property to the Movie entity:
internal class Movie { public ObjectId _id { get; set; } public string title { get; set; } public string rated { get; set; } public string plot { get; set; } public Person WrittenBy { get; set; } } internal class Person { public string FirstName { get; set; } }
Exception:
System.InvalidOperationException: Serializer for Movie does not have a member named WrittenBy. at MongoDB.Driver.Linq.Linq3Implementation.Misc.DocumentSerializerHelper.GetMemberSerializationInfo(IBsonSerializer serializer, String memberName) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.MemberExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, MemberExpression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.ExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, Expression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.MemberExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, MemberExpression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.ExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, Expression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.BinaryExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, BinaryExpression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.ExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, Expression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToFilterTranslators.ExpressionToFilterTranslator.TranslateUsingAggregationOperators(TranslationContext context, Expression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToFilterTranslators.ExpressionToFilterTranslator.Translate(TranslationContext context, Expression expression, Boolean exprOk) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToFilterTranslators.ExpressionToFilterTranslator.TranslateLambda(TranslationContext context, LambdaExpression lambdaExpression, IBsonSerializer parameterSerializer, Boolean asRoot) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.WhereMethodToPipelineTranslator.Translate(TranslationContext context, MethodCallExpression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.ExpressionToPipelineTranslator.Translate(TranslationContext context, Expression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.SelectMethodToPipelineTranslator.Translate(TranslationContext context, MethodCallExpression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.ExpressionToPipelineTranslator.Translate(TranslationContext context, Expression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.AsMethodToPipelineTranslator.Translate(TranslationContext context, MethodCallExpression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.ExpressionToPipelineTranslator.Translate(TranslationContext context, Expression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToExecutableQueryTranslators.FirstMethodToExecutableQueryTranslator`1.Translate[TDocument](MongoQueryProvider`1 provider, TranslationContext context, MethodCallExpression expression) at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToExecutableQueryTranslators.ExpressionToExecutableQueryTranslator.TranslateScalar[TDocument,TResult](MongoQueryProvider`1 provider, Expression expression) at MongoDB.Driver.Linq.Linq3Implementation.MongoQueryProvider`1.Execute[TResult](Expression expression) at MongoDB.EntityFrameworkCore.Query.Visitors.MongoShapedQueryCompilingExpressionVisitor.TranslateAndExecuteQuery[TSource,TResult](QueryContext queryContext, IReadOnlyEntityType entityType, MongoQueryExpression queryExpression, Func`3 shaper, Type contextType, Boolean standAloneStateManager, Boolean threadSafetyChecksEnabled, ResultCardinality resultCardinality) at lambda_method62(Closure, QueryContext) at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExecuteAsync[TResult](Expression query, CancellationToken cancellationToken) at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.ExecuteAsync[TResult](Expression expression, CancellationToken cancellationToken) at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ExecuteAsync[TSource,TResult](MethodInfo operatorMethodInfo, IQueryable`1 source, Expression expression, CancellationToken cancellationToken) at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ExecuteAsync[TSource,TResult](MethodInfo operatorMethodInfo, IQueryable`1 source, LambdaExpression expression, CancellationToken cancellationToken) at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.FirstOrDefaultAsync[TSource](IQueryable`1 source, Expression`1 predicate, CancellationToken cancellationToken) at Program.<Main>$(String[] args) in D:\Projetos\Samples\MongoDbEfProviderLab\Program.cs:line 38