rustyroad 1.5.0

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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//! Reading a single expression from a history row.

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

/// Reads `expression` from the row named `name`.
pub(super) async fn read(
    connection: &DatabaseConnection,
    name: &str,
    expression: &str,
) -> Result<Option<String>, CustomMigrationError> {
    let sql = exec::pick(
        connection,
        &format!("SELECT {expression} FROM {HISTORY_TABLE} WHERE name = $1"),
        &format!("SELECT {expression} FROM {HISTORY_TABLE} WHERE name = ?"),
    )
    .to_string();
    exec::scalar(connection, &sql, &[name]).await
}