Strange behaviour while calling ScanDoc on ResultSet

[robsztal]

Bug Report Checklist (remove this template if submitting a feature request)

1. Which version of Kivik are you using? Please state a version number, or master.

• v4.0.0

2. Which version of Go are you using? (Output of go version) -- Kivik 3.x supports Go 1.9 and later. Kivik 4.x requires Go 1.13 or later, with module support. The Kivik 4/master aims to support Go 1.11 and later, with module support.

• 1.19.3

4. What did you do? (Include your code if possible)

I want to get one specific document with specific id prefix so I am using Find with query selector

doc := db.Find(ctx, query)
res := model.ExampleModel{}
err = doc.ScanDoc(&res)

5. What did you expect to see?

two cases:

• first when there is no document I want empty res or error from ScanDoc?
• second where there is a document I want filled res

7. What did you see instead?

• first example: ScanDoc stays in infinite loop
• second example: works fine

When I am using :

doc := db.Find(ctx, query)
res := model.ExampleModel{}
for doc.Next() {
		err = doc.ScanDoc(&res)
	}

it works like intended but despite that why code is entering infinite loop instead of error or something?

[flimzy]

That code has undergone some changes in the 4.x branch, that have not been fully tested. And I haven't had a chance to get back to it in a while.

My suggestion is to use the stable branch (3.x) instead. It should not have those problems. If it does, of course, please file a bug report about that, and I'll prioritize fixing that.

[robsztal]

@flimzy Ok great! Thanks for reply.

[flimzy]

I believe I have now reproduced this, and have a good idea the cause. I hope to have a fix soon.