Derive Ord and PartialOrd for Auto

[ElijahAhianyo]

Description

This allows us to do this:

#[model]
#[derive(Debug, Clone)]
struct Foo{
   id: Auto<i64>
}

...

let _ = query!(Foo, $id > 1).all(&db).await.unwrap();

Type of change

• Bug fix
• New feature
• Documentation
• Refactor / cleanup
• Performance improvement
• Other (describe above)

Checklist

• I've read the contributing guide
• Tests pass locally (just test-all)
• Code passes clippy (just clippy)
• Code is properly formatted (cargo fmt)
• New tests added (regression test for bugs, coverage for new features)
• Documentation (both code and site) updated (if applicable)

[github-actions]

Bencher Report

Branch	elijah/auto-query-fix
Testbed	github-ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	Benchmark Result milliseconds (ms) (Result Δ%)	Upper Boundary milliseconds (ms) (Limit %)
empty_router/empty_router	📈 view plot 🚷 view threshold	6.68 ms (+9.99%) Baseline: 6.07 ms	7.37 ms (90.59%)
json_api/json_api	📈 view plot 🚷 view threshold	1.20 ms (+13.45%) Baseline: 1.06 ms	1.26 ms (95.42%)
nested_routers/nested_routers	📈 view plot 🚷 view threshold	1.10 ms (+12.58%) Baseline: 0.97 ms	1.15 ms (95.51%)
single_root_route/single_root_route	📈 view plot 🚷 view threshold	1.06 ms (+13.32%) Baseline: 0.94 ms	1.11 ms (95.32%)
single_root_route_burst/single_root_route_burst	📈 view plot 🚷 view threshold	17.72 ms (+0.23%) Baseline: 17.68 ms	21.08 ms (84.05%)

🐰 View full continuous benchmarking report in Bencher

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
rust	89.99% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
cot/src/db.rs	86.17% <ø> (ø)

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[ElijahAhianyo]

@m4tx some more info on this from our call earlier today.

query!(Foo, $id > 1).all(&db).await.unwrap();

expands to become:

<Foo as ::cot::db::Model>::objects().filter(
        ::cot::db::query::ExprOrd::gt(<Order as ::cot::db::Model>::Fields::id, 1)
  )

The impl of ExprOrd::gt requires that the ToDbFieldValue (Auto in this case) implements Ord as well:

cot/cot/src/db/query.rs

Line 1320 in 864b7cd

impl<T: ToDbFieldValue + Ord + 'static> ExprOrd<T> for FieldRef<T> {