Fix call to way:id() in PostGIS profile example

[tumik]

Issue: #6204

Tasklist

• CHANGELOG.md entry (How to write a changelog entry)
• update relevant Wiki pages
• add tests (see testing documentation)
• review
• adjust for comments
• cherry pick to release branch

Requirements / Relations

No requirements or relations.

[mjjbell]

In the issue details you mention that it segfaults on calling way:id().
Can you clarify that you intend this to be a fix?

[tumik]

I did not experience segfaults with this fix unlike the issue creator. This fix works for me.

I suspect the segfault mentioned in the issue was unrelated but might be worth it for someone else to try it out too.

[mjjbell]

I see. I think the PostGIS example is ancient however, and requires upgrading.

For example, when I run it, fails on an earlier line

 traceback:
	profiles/examples/postgis.lua:43: in function 'way_function'
profiles/examples/postgis.lua:43: attempt to index a nil value (field 'tags')

osrm-backend/profiles/examples/postgis.lua

Line 48 in 26d3206

local highway = way.tags:Find("highway")

Probably because the SOL bindings have changed in the last 8 years.