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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
// ConstantScoreQuery is a query that wraps a filter and simply returns
// a constant score equal to the query boost for every document in the filter.
//
// For more details, see:
// https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-constant-score-query.html
type ConstantScoreQuery struct {
filter Query
boost *float64
}
// ConstantScoreQuery creates and initializes a new constant score query.
func NewConstantScoreQuery(filter Query) *ConstantScoreQuery {
return &ConstantScoreQuery{
filter: filter,
}
}
// Boost sets the boost for this query. Documents matching this query
// will (in addition to the normal weightings) have their score multiplied
// by the boost provided.
func (q *ConstantScoreQuery) Boost(boost float64) *ConstantScoreQuery {
q.boost = &boost
return q
}
// Source returns the query source.
func (q *ConstantScoreQuery) Source() (interface{}, error) {
// "constant_score" : {
// "filter" : {
// ....
// },
// "boost" : 1.5
// }
query := make(map[string]interface{})
params := make(map[string]interface{})
query["constant_score"] = params
// filter
src, err := q.filter.Source()
if err != nil {
return nil, err
}
params["filter"] = src
// boost
if q.boost != nil {
params["boost"] = *q.boost
}
return query, nil
}
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