77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
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// Copyright 2012-present Oliver Eilhard. All rights reserved.
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// Use of this source code is governed by a MIT-license.
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// See http://olivere.mit-license.org/license.txt for details.
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package elastic
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// ChildrenAggregation is a special single bucket aggregation that enables
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// aggregating from buckets on parent document types to buckets on child documents.
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// It is available from 1.4.0.Beta1 upwards.
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// See: https://www.elastic.co/guide/en/elasticsearch/reference/6.2/search-aggregations-bucket-children-aggregation.html
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type ChildrenAggregation struct {
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typ string
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subAggregations map[string]Aggregation
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meta map[string]interface{}
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}
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func NewChildrenAggregation() *ChildrenAggregation {
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return &ChildrenAggregation{
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subAggregations: make(map[string]Aggregation),
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}
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}
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func (a *ChildrenAggregation) Type(typ string) *ChildrenAggregation {
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a.typ = typ
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return a
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}
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func (a *ChildrenAggregation) SubAggregation(name string, subAggregation Aggregation) *ChildrenAggregation {
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a.subAggregations[name] = subAggregation
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return a
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}
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// Meta sets the meta data to be included in the aggregation response.
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func (a *ChildrenAggregation) Meta(metaData map[string]interface{}) *ChildrenAggregation {
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a.meta = metaData
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return a
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}
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func (a *ChildrenAggregation) Source() (interface{}, error) {
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// Example:
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// {
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// "aggs" : {
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// "to-answers" : {
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// "children": {
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// "type" : "answer"
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// }
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// }
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// }
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// }
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// This method returns only the { "type" : ... } part.
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source := make(map[string]interface{})
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opts := make(map[string]interface{})
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source["children"] = opts
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opts["type"] = a.typ
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// AggregationBuilder (SubAggregations)
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if len(a.subAggregations) > 0 {
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aggsMap := make(map[string]interface{})
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source["aggregations"] = aggsMap
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for name, aggregate := range a.subAggregations {
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src, err := aggregate.Source()
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if err != nil {
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return nil, err
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}
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aggsMap[name] = src
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}
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}
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// Add Meta data if available
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if len(a.meta) > 0 {
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source["meta"] = a.meta
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}
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return source, nil
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}
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