/// <summary>
/// Appends a $facet stage to the pipeline.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <param name="aggregate">The aggregate.</param>
/// <param name="facets">The facets.</param>
/// <returns>The fluent aggregate interface.</returns>
public static IAggregateFluent <AggregateFacetResults> Facet <TResult>(
this IAggregateFluent <TResult> aggregate,
IEnumerable <AggregateFacet <TResult> > facets)
{
var newResultSerializer = new AggregateFacetResultsSerializer(
facets.Select(f => f.Name),
facets.Select(f => f.OutputSerializer ?? BsonSerializer.SerializerRegistry.GetSerializer(f.OutputType)));
var options = new AggregateFacetOptions <AggregateFacetResults> {
NewResultSerializer = newResultSerializer
};
return(aggregate.Facet(facets, options));
}
public override IAggregateFluent <TNewResult> Facet <TNewResult>(
IEnumerable <AggregateFacet <TResult> > facets,
AggregateFacetOptions <TNewResult> options = null)
{
const string operatorName = "$facet";
var materializedFacets = facets.ToArray();
var stage = new DelegatedPipelineStageDefinition <TResult, TNewResult>(
operatorName,
(s, sr) =>
{
var facetsDocument = new BsonDocument();
foreach (var facet in materializedFacets)
{
var renderedPipeline = facet.RenderPipeline(s, sr);
facetsDocument.Add(facet.Name, renderedPipeline);
}
var document = new BsonDocument("$facet", facetsDocument);
var resultSerializer = options?.NewResultSerializer ?? sr.GetSerializer <TNewResult>();
return(new RenderedPipelineStageDefinition <TNewResult>(operatorName, document, resultSerializer));
});
return(AppendStage <TNewResult>(stage));
}
public override IAggregateFluent <TNewResult> Facet <TNewResult>(
IEnumerable <AggregateFacet <TResult> > facets,
AggregateFacetOptions <TNewResult> options = null)
{
return(WithPipeline(_pipeline.Facet(facets, options)));
}
/// <inheritdoc />
public virtual IAggregateFluent <TNewResult> Facet <TNewResult>(
IEnumerable <AggregateFacet <TResult> > facets,
AggregateFacetOptions <TNewResult> options = null)
{
throw new NotImplementedException();
}