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// Copyright 2012-2015 Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
package elastic
// NestedAggregation is a special single bucket aggregation that enables
// aggregating nested documents.
// See: http://www.elasticsearch.org/guide/en/elasticsearch/reference/master/search-aggregations-bucket-nested-aggregation.html
type NestedAggregation struct {
path string
subAggregations map[string]Aggregation
}
func NewNestedAggregation() NestedAggregation {
a := NestedAggregation{
subAggregations: make(map[string]Aggregation),
}
return a
}
func (a NestedAggregation) SubAggregation(name string, subAggregation Aggregation) NestedAggregation {
a.subAggregations[name] = subAggregation
return a
}
func (a NestedAggregation) Path(path string) NestedAggregation {
a.path = path
return a
}
func (a NestedAggregation) Source() interface{} {
// Example:
// {
// "query" : {
// "match" : { "name" : "led tv" }
// }
// "aggs" : {
// "resellers" : {
// "nested" : {
// "path" : "resellers"
// },
// "aggs" : {
// "min_price" : { "min" : { "field" : "resellers.price" } }
// }
// }
// }
// }
// This method returns only the { "nested" : {} } part.
source := make(map[string]interface{})
opts := make(map[string]interface{})
source["nested"] = opts
opts["path"] = a.path
// AggregationBuilder (SubAggregations)
if len(a.subAggregations) > 0 {
aggsMap := make(map[string]interface{})
source["aggregations"] = aggsMap
for name, aggregate := range a.subAggregations {
aggsMap[name] = aggregate.Source()
}
}
return source
}
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