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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
// ReverseNestedAggregation defines a special single bucket aggregation
// that enables aggregating on parent docs from nested documents.
// Effectively this aggregation can break out of the nested block
// structure and link to other nested structures or the root document,
// which allows nesting other aggregations that aren’t part of
// the nested object in a nested aggregation.
//
// See: https://www.elastic.co/guide/en/elasticsearch/reference/5.2/search-aggregations-bucket-reverse-nested-aggregation.html
type ReverseNestedAggregation struct {
path string
subAggregations map[string]Aggregation
meta map[string]interface{}
}
// NewReverseNestedAggregation initializes a new ReverseNestedAggregation
// bucket aggregation.
func NewReverseNestedAggregation() *ReverseNestedAggregation {
return &ReverseNestedAggregation{
subAggregations: make(map[string]Aggregation),
}
}
// Path set the path to use for this nested aggregation. The path must match
// the path to a nested object in the mappings. If it is not specified
// then this aggregation will go back to the root document.
func (a *ReverseNestedAggregation) Path(path string) *ReverseNestedAggregation {
a.path = path
return a
}
func (a *ReverseNestedAggregation) SubAggregation(name string, subAggregation Aggregation) *ReverseNestedAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *ReverseNestedAggregation) Meta(metaData map[string]interface{}) *ReverseNestedAggregation {
a.meta = metaData
return a
}
func (a *ReverseNestedAggregation) Source() (interface{}, error) {
// Example:
// {
// "aggs" : {
// "reverse_nested" : {
// "path": "..."
// }
// }
// }
// This method returns only the { "reverse_nested" : {} } part.
source := make(map[string]interface{})
opts := make(map[string]interface{})
source["reverse_nested"] = opts
if a.path != "" {
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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