rustyroad 1.8.7

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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//! One-statement deletion through verified unique selectors.

use super::super::naming::{snake, sql};
use super::{selector, targets};
use crate::database::introspection::{Schema, Table};

/// Emits a counted delete; e.g. `delete_sessions_by_session_token(pool, value_1)`.
/// No preliminary read is needed: SQLx returns the affected-row count atomically.
pub(super) fn render(table: &Table, schema: &Schema, key: &[String]) -> String {
    let function = format!("delete_{}_by_{}", snake(&table.name), targets::suffix(key));
    let selector::Selector { parameters, predicate, binds, arguments } = selector::render(table, schema, key);
    let query = format!("DELETE FROM {} WHERE {predicate}", sql(&table.name));
    format!(
        "/// Deletes matching rows; e.g. `{function}(pool, {arguments}).await` returns their count.\n\
         pub async fn {function}(pool: &PgPool, {parameters}) -> Result<u64, sqlx::Error> {{\n\
             let result = sqlx::query({query:?}){binds}.execute(pool).await?;\n\
             Ok(result.rows_affected())\n\
         }}\n\n"
    )
}