public static AggregationDescriptor <T> IntoDateHistogram <T>(this AggregationDescriptor <T> innerAggregation,
Expression <Func <T, Object> > fieldGetter, DateInterval interval) where T : class
{
AggregationDescriptor <T> v = new AggregationDescriptor <T>();
var fieldName = GetName(fieldGetter);
v.DateHistogram(fieldName, dr =>
{
DateHistogramAggregationDescriptor <T> dateAggDesc = new DateHistogramAggregationDescriptor <T>();
dateAggDesc.Field(fieldGetter).Interval(interval);
return(dateAggDesc.Aggregations(x => innerAggregation));
});
return(v);
}
public static DateHistogramAggregationDescriptor <T> AutoFormatTime <T>(this DateHistogramAggregationDescriptor <T> descriptor, FilterOptions.TimeUnit type) where T : class
{
switch (type)
{
case TimeUnit.Hour:
descriptor.CalendarInterval(DateInterval.Hour).Format("HH");
break;
case TimeUnit.Month:
descriptor.CalendarInterval(DateInterval.Month).Format("MM");
break;
case TimeUnit.Year:
descriptor.CalendarInterval(DateInterval.Year).Format("YYYY");
break;
case TimeUnit.Day:
default:
descriptor.CalendarInterval(DateInterval.Day).Format("dd");
break;
}
return(descriptor);
}
