public override RenderedProjectionDefinition <TNewResult> Render(IBsonSerializer <TResult> documentSerializer, IBsonSerializerRegistry serializerRegistry)
{
var renderedOutput = AggregateGroupTranslator.Translate <TValue, TResult, TNewResult>(_valueExpression, _outputExpression, documentSerializer, serializerRegistry, _translationOptions);
var document = renderedOutput.Document;
document.Remove("_id");
return(new RenderedProjectionDefinition <TNewResult>(document, renderedOutput.ProjectionSerializer));
}
internal override RenderedProjectionDefinition <TOutput> TranslateExpressionToGroupProjection <TInput, TKey, TOutput>(
Expression <Func <TInput, TKey> > idExpression,
Expression <Func <IGrouping <TKey, TInput>, TOutput> > groupExpression,
IBsonSerializer <TInput> documentSerializer,
IBsonSerializerRegistry serializerRegistry,
ExpressionTranslationOptions translationOptions)
{
return(AggregateGroupTranslator.Translate <TKey, TInput, TOutput>(idExpression, groupExpression, documentSerializer, serializerRegistry, translationOptions));
}
internal override RenderedProjectionDefinition <TOutput> TranslateExpressionToBucketOutputProjection <TInput, TValue, TOutput>(
Expression <Func <TInput, TValue> > valueExpression,
Expression <Func <IGrouping <TValue, TInput>, TOutput> > outputExpression,
IBsonSerializer <TInput> documentSerializer,
IBsonSerializerRegistry serializerRegistry,
ExpressionTranslationOptions translationOptions)
{
var renderedOutput = AggregateGroupTranslator.Translate <TValue, TInput, TOutput>(valueExpression, outputExpression, documentSerializer, serializerRegistry, translationOptions);
var document = renderedOutput.Document;
document.Remove("_id");
return(new RenderedProjectionDefinition <TOutput>(document, renderedOutput.ProjectionSerializer));
}
private ProjectedResult <TResult> Group <TKey, TResult>(Expression <Func <Root, TKey> > idProjector, Expression <Func <IGrouping <TKey, Root>, TResult> > groupProjector, ExpressionTranslationOptions translationOptions)
{
var serializer = BsonSerializer.SerializerRegistry.GetSerializer <Root>();
var projectionInfo = AggregateGroupTranslator.Translate <TKey, Root, TResult>(idProjector, groupProjector, serializer, BsonSerializer.SerializerRegistry, translationOptions);
var group = new BsonDocument("$group", projectionInfo.Document);
var sort = new BsonDocument("$sort", new BsonDocument("_id", 1));
var list = __collection.Aggregate <TResult>(new BsonDocumentStagePipelineDefinition <Root, TResult>(new[] { group, sort }, projectionInfo.ProjectionSerializer)).ToList();
return(new ProjectedResult <TResult>
{
Projection = projectionInfo.Document,
Value = (TResult)list[0]
});
}
public override RenderedProjectionDefinition <TNewResult> Render(IBsonSerializer <TResult> documentSerializer, IBsonSerializerRegistry serializerRegistry)
{
return(AggregateGroupTranslator.Translate <TKey, TResult, TNewResult>(_idExpression, _groupExpression, documentSerializer, serializerRegistry, _translationOptions));
}
