feat: add order-by logic to database queries

[xelab04]

Refer to #490

[xelab04]

https://docs.rs/sea-query/latest/sea_query/query/trait.OrderedStatement.html
The sea query docs make a reference to order_by_expr which takes expr: SimpleExpr, order: Order

I'm not exactly sure how to plug sea query into this?

[xelab04]

Right, updated it to use seaquery's own order_by method. I'm not getting the types down for the time being, will work on it more later.

[xelab04]

I have changed it so that instead of ordering on a string of the field name, it uses the fieldref identifier.
So, it would look something like this:

use cot::db::model;
use cot::db::query::Query;
use sea_query::Order; (?)

#[model]
struct User {
    #[model(primary_key)]
    id: i32,
    age: i32,
}

let query = Query::<User>::new().order_by(User::age, Order::Asc);

Last bit is the ownership because it's not happy with the .clone()
And of course, tests

[seqre]

Hey @xelab04, how it's going with this PR? Do you need any help from us?

[ElijahAhianyo]

Hey @xelab04, How's it going with this PR? We're thinking of getting this PR in for the next release planned for this week. I see this is mostly done, and if you don't mind, I would love to finish this if you don't have the time.

[xelab04]

Hi @ElijahAhianyo I had forgotten about this PR till recently because of a series of illnesses. My apologies.

Yes, I remember having mostly completed the PR, but was particularly stumped with creating the proper tests for it. I'd be really happy if you could complete it; I'll also use the opportunity to better understand how I should have done it.

I'm sorry it's been in draft for so long.

[ElijahAhianyo]

Hi @ElijahAhianyo I had forgotten about this PR till recently because of a series of illnesses. My apologies.

Yes, I remember having mostly completed the PR, but was particularly stumped with creating the proper tests for it. I'd be really happy if you could complete it; I'll also use the opportunity to better understand how I should have done it.

I'm sorry it's been in draft for so long.

Ah, no worries. I'll take this up from here and also wish you a speedy recovery. Thanks a lot for your contribution!