Storing additional data

[CGenie]

Hello,
I want to have an index, but one that stores some additional data so that when I query the index, I can fetch that data (not search on it). How can I do it?

I tried something like type Tags = map[string]string and

tagsMapping := bleve.NewKeywordFieldMapping()
tagsMapping.Analyzer = ""
tagsMapping.Index = false
tagsMapping.Store = true

docMapping.AddFieldMappingsAt("tags", tagsMapping)

Apparently I can index my document with Tags, but when I try to search for it like this:

searchReq.Fields = []string{"address", "city", "geo", "tags"}
...
myDoc.Tags = hit.Fields["tags"].(map[string]string)

I get an error:

interface conversion: interface {} is nil, not map[string]string

[metonymic-smokey]

Hi @CGenie
could you pls provide the complete program so I can reproduce this locally?

[CGenie]

Sure: https://git.sr.ht/~cgenie/bleve-geo-test/

Basically when I add tags parsing as in line https://git.sr.ht/~cgenie/bleve-geo-test/tree/master/item/main.go#L72 I get this error:

panic: interface conversion: interface {} is nil, not map[string]string

[CGenie]

BTW, I am able to cheat a bit and set Tags string and use json.Marshall. However, I thought that blave is able to index any Go datatype.

[CGenie]

OK so apparently when I set

searchRequest.Fields = []string{"*"}

and then print out json.Marshal(hit), I get something like this:

{"id":"ABC1","score":0.21019982325694714,"sort":["_score"],"fields":{"location":[77.68416429350248,13.019409348028574],"location.Lat":13.019409351686077,"location.Lon":77.684164354519,"name":"ABC1","tags.tag1":"a","tags.tag2":"b","type":"myDoc"}}

So this seems to be indexed as tags.tag1, tags.tag2 and not as tags: {"tag1": ..., "tag2": ...}.

[CGenie]

OK and apparently I can fetch a single field via hits.Fields["tags.tag1"].(string). So I need to know its type and name beforehand?