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// Copyright 2012-present 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: https://www.elastic.co/guide/en/elasticsearch/reference/6.0/search-aggregations-bucket-nested-aggregation.html
type NestedAggregation struct {
path string
subAggregations map[string]Aggregation
meta map[string]interface{}
}
func NewNestedAggregation() *NestedAggregation {
return &NestedAggregation{
subAggregations: make(map[string]Aggregation),
}
}
func (a *NestedAggregation) SubAggregation(name string, subAggregation Aggregation) *NestedAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *NestedAggregation) Meta(metaData map[string]interface{}) *NestedAggregation {
a.meta = metaData
return a
}
func (a *NestedAggregation) Path(path string) *NestedAggregation {
a.path = path
return a
}
func (a *NestedAggregation) Source() (interface{}, error) {
// 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 {
src, err := aggregate.Source()
if err != nil {
return nil, err
}
aggsMap[name] = src
}
}
// Add Meta data if available
if len(a.meta) > 0 {
source["meta"] = a.meta
}
return source, nil
}
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