Module string_column 

Support for custom column types stored as text — the common case being a Rust enum persisted as a string ("pending", "verified", …).

Implement StringColumn for your type (how it maps to/from a string), then impl_string_column!(YourType) to wire it into the ORM: it gets a Text SqlType, and ToColumn / FromColumn impls (for both T and Option<T>) so it can be a #[derive(Entity)] field like any primitive.

use rainier_orm::{StringColumn, impl_string_column, Result, Error};

#[derive(Clone, PartialEq)]
enum Status { Pending, Verified, Rejected }

impl StringColumn for Status {
    fn to_column_str(&self) -> String {
        match self { Status::Pending => "pending", Status::Verified => "verified", Status::Rejected => "rejected" }.into()
    }
    fn from_column_str(s: &str) -> Result<Self> {
        match s {
            "pending" => Ok(Status::Pending),
            "verified" => Ok(Status::Verified),
            "rejected" => Ok(Status::Rejected),
            other => Err(Error::msg(format!("unknown Status `{other}`"))),
        }
    }
}
impl_string_column!(Status);

Traits

StringColumn

How a custom type maps to and from its stored string form. The string is what lands in a TEXT/VARCHAR column.