Macro Q 

Q!() { /* proc-macro */ }

Q!() — Model.field__lookup = value filter syntax, resolved at compile time against typed columns. Issue #269 / T1.7.

Each invocation lowers to the equivalent typed-column method call:

// These expand identically:
Q!(User.email__icontains = "alice")
User::email.ilike("%alice%")

Field-name typos fail the build (the macro emits User::no_such_field which doesn’t exist) — the headline ergonomic win of this slice over filters keyed by a plain string.

Supported lookup suffixes

• bare = / __exact → .eq(value)
• __iexact → .ilike(value) (case-insensitive equality, no wildcards)
• __ne → .ne(value)
• __gt / __gte / __lt / __lte → corresponding comparison
• __contains / __icontains → .like("%v%") / .ilike("%v%")
• __startswith / __istartswith → .like("v%") / .ilike("v%")
• __endswith / __iendswith → .like("%v") / .ilike("%v")
• __in → .is_in(iterable)
• __not_in → .not_in(iterable)
• __isnull = true → .is_null(); __isnull = false → .is_not_null()
• __between accepts a tuple literal (lo, hi) → .between(lo, hi)
• __regex / __iregex → .regex(pattern) / .iregex(pattern)

Unknown suffixes fail the build with a compile_error! pointing at the lookup token.

Combine

Each Q!() returns a TypedFilter<Model> — chain via the existing .and() / .or() / .not() methods:

User::objects()
    .where_(
        Q!(User.active = true)
            .and(Q!(User.email__icontains = "alice"))
    )
    .fetch(&pool).await?;

All emitted code routes through existing per-dialect writers — no new SQL emission machinery. Tri-dialect support is inherent.