121 lines
2.9 KiB
Go
121 lines
2.9 KiB
Go
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// 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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// FuzzyQuery uses similarity based on Levenshtein edit distance for
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// string fields, and a +/- margin on numeric and date fields.
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//
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// For more details, see
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// https://www.elastic.co/guide/en/elasticsearch/reference/6.2/query-dsl-fuzzy-query.html
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type FuzzyQuery struct {
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name string
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value interface{}
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boost *float64
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fuzziness interface{}
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prefixLength *int
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maxExpansions *int
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transpositions *bool
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rewrite string
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queryName string
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}
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// NewFuzzyQuery creates a new fuzzy query.
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func NewFuzzyQuery(name string, value interface{}) *FuzzyQuery {
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q := &FuzzyQuery{
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name: name,
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value: value,
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}
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return q
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}
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// Boost sets the boost for this query. Documents matching this query will
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// (in addition to the normal weightings) have their score multiplied by
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// the boost provided.
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func (q *FuzzyQuery) Boost(boost float64) *FuzzyQuery {
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q.boost = &boost
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return q
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}
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// Fuzziness can be an integer/long like 0, 1 or 2 as well as strings
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// like "auto", "0..1", "1..4" or "0.0..1.0".
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func (q *FuzzyQuery) Fuzziness(fuzziness interface{}) *FuzzyQuery {
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q.fuzziness = fuzziness
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return q
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}
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func (q *FuzzyQuery) PrefixLength(prefixLength int) *FuzzyQuery {
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q.prefixLength = &prefixLength
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return q
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}
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func (q *FuzzyQuery) MaxExpansions(maxExpansions int) *FuzzyQuery {
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q.maxExpansions = &maxExpansions
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return q
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}
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func (q *FuzzyQuery) Transpositions(transpositions bool) *FuzzyQuery {
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q.transpositions = &transpositions
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return q
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}
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func (q *FuzzyQuery) Rewrite(rewrite string) *FuzzyQuery {
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q.rewrite = rewrite
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return q
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}
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// QueryName sets the query name for the filter that can be used when
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// searching for matched filters per hit.
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func (q *FuzzyQuery) QueryName(queryName string) *FuzzyQuery {
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q.queryName = queryName
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return q
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}
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// Source returns JSON for the function score query.
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func (q *FuzzyQuery) Source() (interface{}, error) {
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// {
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// "fuzzy" : {
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// "user" : {
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// "value" : "ki",
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// "boost" : 1.0,
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// "fuzziness" : 2,
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// "prefix_length" : 0,
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// "max_expansions" : 100
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// }
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// }
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source := make(map[string]interface{})
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query := make(map[string]interface{})
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source["fuzzy"] = query
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fq := make(map[string]interface{})
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query[q.name] = fq
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fq["value"] = q.value
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if q.boost != nil {
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fq["boost"] = *q.boost
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}
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if q.transpositions != nil {
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fq["transpositions"] = *q.transpositions
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}
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if q.fuzziness != nil {
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fq["fuzziness"] = q.fuzziness
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}
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if q.prefixLength != nil {
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fq["prefix_length"] = *q.prefixLength
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}
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if q.maxExpansions != nil {
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fq["max_expansions"] = *q.maxExpansions
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}
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if q.rewrite != "" {
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fq["rewrite"] = q.rewrite
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}
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if q.queryName != "" {
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fq["_name"] = q.queryName
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}
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return source, nil
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}
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