Relevance parameters are not respected

[Valtteri Karesto]

Describe the bug

When you make a search with Orama and use relevance parameters those doesn't seem to have any effect on search results (or their scores).

await search(db, {
  term: "cat",
  relevance: {
        k: 2,
        b: 1.25,
})

The problem seems to be this exact line https://github.com/oramasearch/orama/blob/8377849700d62176c0eeeaf09c12637479e3c3fb/packages/orama/src/methods/search-fulltext.ts#L32

params.relevance = Object.assign(params.relevance ?? {}, defaultBM25Params)

params.relevance is always overwritten by defaultBM25Params. I think the Object.assign parameters should be flipped around so then we would overwrite defaults with custom parameters instead the other way.

So the solution would be?

params.relevance = Object.assign(defaultBM25Params, params.relevance ?? {})

To Reproduce

• Create db
• Insert few documents
• Adjust relevance values
• Scores stay the same

I was able to find out that

Expected behavior

I would expect the scores to change

Environment Info

OS: MacOS 14.1.2
Node: 20.11.0
Orama: 2.0.7

Affected areas

Search

Additional context

No response

[Michele Riva]

Fixed with #643, thank you!