Derive Macro Cacheable

#[derive(Cacheable)]
{
    // Attributes available to this derive:
    #[cacheable]
}

Expand description

Derive macro for sassi::Cacheable.

Generates:

A companion {StructName}Fields struct with one sassi::Field<Self, FieldType> per declared field.
impl sassi::Cacheable for {StructName} with:
- Id = the type of the field literally named id.
- fields() trait method wiring every accessor to its real extractor (so generic T: Cacheable callers can construct wired Fields without knowing the concrete type).
When #[cacheable(watermark_field = "...")] is present, an impl sassi::DeltaSyncCacheable whose Watermark is the named field’s type and whose watermark() clones that field.

Requirements:

Input must be a struct with named fields.
One of the fields must be literally named id.
id’s type must implement Hash + Eq + Clone + Ord + Send + Sync + 'static.
watermark_field, when present, must name a field whose type implements sassi::MonotonicWatermark.

Cacheable