/// <summary>
/// Retrieves the terms aggregation just by it's name
/// </summary>
public static IReadOnlyCollection <KeyedBucket <string> > GetGroupBy(this AggregateDictionary aggs, string aggName)
{
aggs.CheckForAggregationInResult(aggName);
var itemsTerms = aggs.Terms(aggName);
return(itemsTerms.Buckets);
}
private static IEnumerable <AggregationResult> GetAggregationResultsFrom(AggregateDictionary aggregations)
{
if (aggregations == null)
{
return(Enumerable.Empty <AggregationResult>());
}
var terms = aggregations.Terms(SubCategoriesAggregationName);
if (terms == null)
{
return(Enumerable.Empty <AggregationResult>());
}
var items = terms.Buckets.Select(bucket => new AggregationResult
{
Code = bucket.Key,
Count = bucket.DocCount.GetValueOrDefault(0)
});
return(items);
}
public static IEnumerable <V> GetDistinct <T, V>(this AggregateDictionary aggs, Expression <Func <T, V> > fieldGetter)
{
var aggName = fieldGetter.GetAggName(AggType.Distinct);
var itemsTerms = aggs.Terms(aggName);
var targetType = typeof(V);
if (targetType.IsEnum)
{
return(itemsTerms.Buckets.Select((x => Filters.Parse <V>(x.Key))));
}
if (targetType == typeof(string))
{
return(itemsTerms.Buckets.Select(x => x.Key).Cast <V>());
}
if (targetType == typeof(long) || targetType == typeof(int))
{
return(itemsTerms.Buckets.Select(x => long.Parse(x.Key)).Cast <V>());
}
throw new NotImplementedException("You can get only distinct values of Strings, Enums, ints or long");
}
