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utils/pkg/es/search_queries_script_score.go

110 lines
2.6 KiB

// 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 es
import "errors"
// ScriptScoreQuery uses a script to provide a custom score for returned documents.
//
// A ScriptScoreQuery query is useful if, for example, a scoring function is
// expensive and you only need to calculate the score of a filtered set of documents.
//
// For more details, see
// https://www.elastic.co/guide/en/elasticsearch/reference/7.4/query-dsl-script-score-query.html
type ScriptScoreQuery struct {
query Query
script *Script
minScore *float64
boost *float64
queryName string
}
// NewScriptScoreQuery creates and initializes a new script_score query.
func NewScriptScoreQuery(query Query, script *Script) *ScriptScoreQuery {
return &ScriptScoreQuery{
query: query,
script: script,
}
}
// Query to be used in the ScriptScoreQuery.
func (q *ScriptScoreQuery) Query(query Query) *ScriptScoreQuery {
q.query = query
return q
}
// Script to calculate the score.
func (q *ScriptScoreQuery) Script(script *Script) *ScriptScoreQuery {
q.script = script
return q
}
// MinScore sets the minimum score.
func (q *ScriptScoreQuery) MinScore(minScore float64) *ScriptScoreQuery {
q.minScore = &minScore
return q
}
// Boost sets the boost for this query.
func (q *ScriptScoreQuery) Boost(boost float64) *ScriptScoreQuery {
q.boost = &boost
return q
}
// QueryName sets the query name for the filter.
func (q *ScriptScoreQuery) QueryName(queryName string) *ScriptScoreQuery {
q.queryName = queryName
return q
}
// Source returns JSON for the function score query.
func (q *ScriptScoreQuery) Source() (interface{}, error) {
// {
// "script_score" : {
// "query" : {
// "match" : { "message": "elasticsearch" }
// },
// "script" : {
// "source" : "doc['likes'].value / 10"
// }
// }
// }
source := make(map[string]interface{})
query := make(map[string]interface{})
source["script_score"] = query
if q.query == nil {
return nil, errors.New("ScriptScoreQuery: Query is missing")
}
if q.script == nil {
return nil, errors.New("ScriptScoreQuery: Script is missing")
}
if src, err := q.query.Source(); err != nil {
return nil, err
} else {
query["query"] = src
}
if src, err := q.script.Source(); err != nil {
return nil, err
} else {
query["script"] = src
}
if v := q.minScore; v != nil {
query["min_score"] = *v
}
if v := q.boost; v != nil {
query["boost"] = *v
}
if q.queryName != "" {
query["_name"] = q.queryName
}
return source, nil
}