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83 lines
2.1 KiB
83 lines
2.1 KiB
9 years ago
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// Copyright 2012-2015 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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// NestedAggregation is a special single bucket aggregation that enables
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// aggregating nested documents.
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// See: http://www.elasticsearch.org/guide/en/elasticsearch/reference/master/search-aggregations-bucket-nested-aggregation.html
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type NestedAggregation 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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func NewNestedAggregation() *NestedAggregation {
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return &NestedAggregation{
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subAggregations: make(map[string]Aggregation),
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}
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}
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func (a *NestedAggregation) SubAggregation(name string, subAggregation Aggregation) *NestedAggregation {
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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 *NestedAggregation) Meta(metaData map[string]interface{}) *NestedAggregation {
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a.meta = metaData
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return a
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}
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func (a *NestedAggregation) Path(path string) *NestedAggregation {
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a.path = path
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return a
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}
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func (a *NestedAggregation) Source() (interface{}, error) {
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// Example:
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// {
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// "query" : {
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// "match" : { "name" : "led tv" }
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// }
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// "aggs" : {
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// "resellers" : {
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// "nested" : {
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// "path" : "resellers"
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// },
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// "aggs" : {
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// "min_price" : { "min" : { "field" : "resellers.price" } }
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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 { "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["nested"] = opts
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opts["path"] = a.path
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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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