rustyroad 1.7.3

Rusty Road is a framework written in Rust that is based on Ruby on Rails. It is designed to provide the familiar conventions and ease of use of Ruby on Rails, while also taking advantage of the performance and efficiency of Rust.
Documentation 
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//! Rolling back a started-but-incomplete migration.

use super::{context, report, SCHEMA};
use crate::database::versions::{lifecycle, query, source};

/// Undoes the in-progress migration, keeping the previous version in place.
pub(super) async fn run() {
    let connection = context::connect().await;

    let active = match query::active(&connection).await {
        Ok(Some(active)) => active,
        Ok(None) => return report::fail("no migration is in progress"),
        Err(error) => return report::fail(&error.to_string()),
    };

    // Undoing a started migration applies its down.sql, when it has one.
    let sql = source::down(&active).unwrap_or_default();

    match lifecycle::rollback(&connection, SCHEMA, &sql).await {
        Ok(version) => report::rolled_back(&version),
        Err(error) => report::fail(&error.to_string()),
    }
}