How to extract _id

[mliker]

I looked at you lua-cbson project, but still can't figure it out.

local doc, err = users:find_one({ email = "user@domain.com" })
for k,v in pairs(doc) do
  ngx.say(k,v)
end

results in: bad argument #2 to 'say' (string, number, boolean, nil, ngx.null, or array table expected, but got userdata)

[isage]

Sadly, openresty's ngx.say doesn't automatically call __tostring metamethod on userdata, as opposed to lua's print. So you'll need to explicitly call tostring yourself, e.g.:

local doc, err = users:find_one({ email = "user@domain.com" })
for k,v in pairs(doc) do
  ngx.say(tostring(k), tostring(v))
end

[mliker]

Excellent! Thank you for your answer.