Constant RELATION 

pub const RELATION: ColumnMarker;

Sets the reverse relation accessor name on the referenced table.

By default, reverse relations are named from the source table (posts for a Post table). When multiple foreign keys target the same table — or the FK is self-referential — the name is disambiguated as {forward}_{plural} (e.g. author_posts). Use relation to pick an explicit reverse name instead.

The forward relation (on this table) is unchanged; only the reverse accessor on the referenced table is renamed.

Example

// Users get `.authored()` instead of `.author_posts()`
#[column(REFERENCES = User::id, RELATION = "authored")]
author_id: i32,

// Still auto-disambiguated: Users get `.editor_posts()`
#[column(REFERENCES = User::id)]
editor_id: Option<i32>,

Requires a REFERENCES attribute on the same column.