rustyroad 1.8.0

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.
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//! Version pointers: what is active, current, and latest.

use crate::database::migrations::CustomMigrationError;
use crate::database::versions::exec;
use crate::database::versions::history::HISTORY_TABLE;
use crate::database::DatabaseConnection;

/// Returns the name of the in-progress migration, if any.
pub async fn active(
    connection: &DatabaseConnection,
) -> Result<Option<String>, CustomMigrationError> {
    let sql = format!("SELECT name FROM {HISTORY_TABLE} WHERE done = FALSE LIMIT 1");
    exec::scalar(connection, &sql, &[]).await
}

/// Returns the most recently recorded migration, completed or not.
///
/// This is the parent for the next migration inserted.
pub async fn latest(
    connection: &DatabaseConnection,
) -> Result<Option<String>, CustomMigrationError> {
    let sql =
        format!("SELECT name FROM {HISTORY_TABLE} ORDER BY created_at DESC, name DESC LIMIT 1");
    exec::scalar(connection, &sql, &[]).await
}

/// Returns the most recent completed migration, which is the version being served.
pub async fn current_version(
    connection: &DatabaseConnection,
) -> Result<Option<String>, CustomMigrationError> {
    let sql = format!(
        "SELECT name FROM {HISTORY_TABLE} WHERE done = TRUE \
         ORDER BY created_at DESC, name DESC LIMIT 1"
    );
    exec::scalar(connection, &sql, &[]).await
}