/// <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));
}
private async Task <IEnumerable <SearchFacet> > GenerateSearchFacets(IAggregateFluent <Recipe> matchResult, IEnumerable <SearchFacet> selectedFacets)
{
var searechFacets = await matchResult.Facet(CreateFacet().ToArray()).ToListAsync();
var results = searechFacets.First().Facets.Select(x => new { Group = x.Name, Facets = x.Output <AggregateSortByCountResult <string> >() });
return(from result in results
from facet in result.Facets
select
(new SearchFacet {
Count = (Int32)facet.Count,
Title = facet.Id,
Group = result.Group,
Selected = (selectedFacets.Any(x => x.Group == result.Group && x.Title == facet.Id))
}));
}
/// <summary>
/// Appends a $facet stage to the pipeline.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <typeparam name="TNewResult">The type of the new result.</typeparam>
/// <param name="aggregate">The aggregate.</param>
/// <param name="facets">The facets.</param>
/// <returns>
/// The fluent aggregate interface.
/// </returns>
public static IAggregateFluent <TNewResult> Facet <TResult, TNewResult>(
this IAggregateFluent <TResult> aggregate,
params AggregateFacet <TResult>[] facets)
{
return(aggregate.Facet <TNewResult>((IEnumerable <AggregateFacet <TResult> >)facets));
}