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86 lines
2.6 KiB
86 lines
2.6 KiB
// 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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// ReverseNestedAggregation defines a special single bucket aggregation
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// that enables aggregating on parent docs from nested documents.
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// Effectively this aggregation can break out of the nested block
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// structure and link to other nested structures or the root document,
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// which allows nesting other aggregations that aren’t part of
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// the nested object in a nested aggregation.
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//
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// See: https://www.elastic.co/guide/en/elasticsearch/reference/7.0/search-aggregations-bucket-reverse-nested-aggregation.html
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type ReverseNestedAggregation struct {
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path 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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// NewReverseNestedAggregation initializes a new ReverseNestedAggregation
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// bucket aggregation.
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func NewReverseNestedAggregation() *ReverseNestedAggregation {
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return &ReverseNestedAggregation{
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subAggregations: make(map[string]Aggregation),
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}
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}
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// Path set the path to use for this nested aggregation. The path must match
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// the path to a nested object in the mappings. If it is not specified
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// then this aggregation will go back to the root document.
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func (a *ReverseNestedAggregation) Path(path string) *ReverseNestedAggregation {
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a.path = path
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return a
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}
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func (a *ReverseNestedAggregation) SubAggregation(name string, subAggregation Aggregation) *ReverseNestedAggregation {
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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 *ReverseNestedAggregation) Meta(metaData map[string]interface{}) *ReverseNestedAggregation {
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a.meta = metaData
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return a
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}
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func (a *ReverseNestedAggregation) Source() (interface{}, error) {
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// Example:
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// {
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// "aggs" : {
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// "reverse_nested" : {
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// "path": "..."
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// }
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// }
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// }
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// This method returns only the { "reverse_nested" : {} } part.
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source := make(map[string]interface{})
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opts := make(map[string]interface{})
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source["reverse_nested"] = opts
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if a.path != "" {
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opts["path"] = a.path
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}
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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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