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82 lines
2.1 KiB
82 lines
2.1 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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// NestedAggregation is a special single bucket aggregation that enables |
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// aggregating nested documents. |
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// See: https://www.elastic.co/guide/en/elasticsearch/reference/5.2/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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