Summary
Generated projection stage does not use registered class maps.
How to Reproduce
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BsonClassMap.RegisterClassMap(new ItemClassMap()); BsonClassMap.RegisterClassMap(new SubItemClassMap()); BsonClassMap.RegisterClassMap(new AggregationClassMap());var pipeline = PipelineDefinitionBuilder.For<Item>() .Group( e => e.Date, grouping => new Aggregation { Date = grouping.Key, Count = grouping.Sum(item => item.Items.Length) });var renderedPipeline = pipeline.Render(BsonSerializer.LookupSerializer<Item>(), BsonSerializer.SerializerRegistry, LinqProvider.V3).Documents;foreach (var doc in renderedPipeline) Console.WriteLine(doc.ToString()); public class SubItem { public string Name { get; set; } } public class Item { public string Id { get; set; } public DateTime Date { get; set; } public SubItem[] Items { get; set; } } public class Aggregation { public DateTime Date { get; set; } public long Count { get; set; } } public class SubItemClassMap : BsonClassMap<SubItem> { public SubItemClassMap() { MapMember(e => e.Name).SetElementName("name"); } } public class ItemClassMap : BsonClassMap<Item> { public ItemClassMap() { MapIdField(e => e.Id).SetIdGenerator(StringObjectIdGenerator.Instance); MapMember(e => e.Date).SetElementName("date"); MapMember(e => e.Items).SetElementName("items"); } } public class AggregationClassMap : BsonClassMap<Aggregation> { public AggregationClassMap() { MapMember(e => e.Date).SetElementName("date"); MapMember(e => e.Count).SetElementName("count"); } }
The generated documents looks following:
[
{ "$group" : {
"_id" : "$date",
"__agg0" : { "$sum" : { "$size" : "$items" } }
}}
{ "$project" : {
"Date" : "$_id",
"Count" : { "$toLong" : "$__agg0" },
"_id" : 0
}}
]
I've expected the following
[
{ "$group" : {
"_id" : "$date",
"__agg0" : { "$sum" : { "$size" : "$items" } }
}}
{ "$project" : {
"date" : "$_id",
"count" : { "$toLong" : "$__agg0" },
"_id" : 0
}}
]
The 2.18.0 driver generates a $convert step instead of the $toLong. Using $toLong seems to be correct for 2.19.0
- related to
-
CSHARP-4819 ReplaceWith not respecting custom element name configured by the serializer
-
- Investigating
-