Creating a Pool from Opts / Optsbuilder

[peternormann]

Hi,

I am having a hard time figuring out how the Optsbuilder is supposed to be used. Maybe it's a relic from earlier versions?

I am trying to get a Pool connection, building the Opts used for the connection manually (not using an .env DATABASE_URL variable), but I can't figure out how to get from an Opts(/-builder) to a Pool.

Looking at the Pool:

#[derive(Debug, Clone)]
pub struct Pool {
    opts: Opts,
    inner: Arc<Inner>,
    drop: mpsc::UnboundedSender<Option<Conn>>,
}

impl Pool {
    ...
    pub fn new<O>(opts: O) -> Pool
    where
        Opts: TryFrom<O>,
        <Opts as TryFrom<O>>::Error: std::error::Error,
    {
        let opts = Opts::try_from(opts).unwrap(); // <-- needs a &str
        let pool_opts = opts.pool_opts().clone();
        let (tx, rx) = mpsc::unbounded_channel();
        Pool {
            opts,
             <private properties>
         }

Even though I have successfully build the Opts instance using Optsbuilder, PoolOptions, Constraints and whatnot, I can't instantiate a Pool connection.

The constraints for the Pool:new method seems to be met, but the first line let opts = Opts::try_from(opts).unwrap();
insists the opts variable is a &str and not an Opts instance.

Since the properties for the Pool struct are private, I can't manually return one from my method and I can't find anywhere I can get a Pool instance using an Opts.

Is it necessary to build a url string rather than make use of the Optsbuilder?

What am I missing?

[blackbeam]

Hi.

I just compiled the following code without issues, so could you please provide a code sample that illustrates your issue?

// `get_opts` here is just a helper that
// returns an OptsBuilder instance
let opts = Opts::from(get_opts());
let pool = Pool::new(opts);

Please also note, that you can call Poll:new right with an OptsBuilder instance.

[peternormann]

Hi, appreciate you taking the time to respond.

It appears I was barking up the wrong tree. It compiles now that I fixed something else. The IDE is complaining about passing the builder to the Pool::new(), but it compiles just fine now. Still trying to learn the ropes here.