`prev_page` field is always `null` on search

[GuillaumeGomez]

Current Behavior

prev_page is always null.

Expected Behavior

It should return the seek for the previous page if there is one.

Steps To Reproduce

You can see the issue on docs.rs:

Go to https://docs.rs/releases/search?query=sysinfo
Click "next page"

Then you can see that there is no "previous page" button. I originally suspected a bug on docs.rs side but after investigating, it looks like the ["api", "v1", "crates"] query always return a null prev_page in the JSON response.

Environment

No response

Anything else?

No response

[Turbo87]

That's intended behavior. The way seek pagination is implemented we can't offer reverse traversal without sacrificing performance.

[GuillaumeGomez]

I see. I suppose we can store the previous page in the cookie session... Gonna find something out.

[eth3lbert]

That's intended behavior. The way seek pagination is implemented we can't offer reverse traversal without sacrificing performance.

I don't expect significant performance issues. It would only involve some reverse handling (including query and result processing). This is actually one of the enhancement items on my backlog.