bleve_term_query.go

package main

import (
	"fmt"

	"github.com/blevesearch/bleve"
)

type x struct {
	Level, Parent string
}

func main() {
	index := indexCreate()

	// populate index with sample data
	values := []x{x{"1", "cookies"}, x{"9", "sweet-cookies"}}
	for _, data := range values {
		index.Index(data.Level, data)
	}

	// now let's do term queries..

	// THIS WORKS: term query on level field but with short term value
	levelQuery := bleve.NewTermQuery("1").SetField("Level")
	levelReq := bleve.NewSearchRequest(levelQuery)
	levelRslt, _ := index.Search(levelReq)
	// count is 1
	fmt.Println(len(levelRslt.Hits))

	// THIS DO NOT WORK: term query on parent field but with longer term value
	parentQuery := bleve.NewTermQuery("cookies").SetField("Parent")
	parentReq := bleve.NewSearchRequest(parentQuery)
	parentRslt, _ := index.Search(parentReq)
	// count is 0 - why?
	fmt.Println(len(parentRslt.Hits))

	// I could use MatchQuery but..
	// MatchQuery will return both results for 'cookies' since it's a match (not exact) query type

	// I also could use BooleanQuery like so..
	// bleve.NewBooleanQuery(
	//     []bleve.Query{bleve.NewTermQuery("<level>").SetField("Level")},
	//     []bleve.Query{bleve.NewMatchQuery("<parent>").SetField("Parent")},
	//     nil)
	// but I don;t always know the "level" value!
}

func indexCreate() bleve.Index {
	kwFieldMapping := bleve.NewTextFieldMapping()
	kwFieldMapping.Analyzer = "keyword"

	docMapping := bleve.NewDocumentMapping()
	docMapping.AddFieldMappingsAt("Level", kwFieldMapping)
	docMapping.AddFieldMappingsAt("Parent", kwFieldMapping)

	indexMapping := bleve.NewIndexMapping()
	// this adds docMapping for type "Document"
	// but bleve has no way to know that the documents
	// you are indexing are of this type
	// so it is using the default mapping
	// which was not configured
	//indexMapping.AddDocumentMapping("Document", docMapping)

	// instead you could have set
	indexMapping.DefaultMapping = docMapping
	indexMapping.DefaultAnalyzer = "en"

	index, _ := bleve.New("test.bleve", indexMapping)
	return index
}