rustyroad 1.8.8

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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//! Conflict targets from the catalog's representable, immediate unique keys.

use super::super::naming::snake;
use crate::database::introspection::Table;
use std::collections::BTreeSet;

/// Deduplicates equivalent keys; e.g. two unique `page_id` indexes yield one target.
/// Index producers must honor the catalog contract: no predicates or expressions.
pub(super) fn keys(table: &Table) -> Vec<Vec<String>> {
    if table.view {
        return Vec::new();
    }
    table
        .uniques
        .iter()
        .map(|key| &key.columns)
        .chain(
            table
                .indexes
                .iter()
                .filter(|index| index.unique)
                .map(|index| &index.columns),
        )
        .filter(|key| !key.is_empty() && key.iter().all(|name| table.column(name).is_some()))
        .map(|key| {
            let mut key = key.clone();
            key.sort();
            key.dedup();
            key
        })
        .collect::<BTreeSet<_>>()
        .into_iter()
        .collect()
}

/// Names a target; e.g. `suffix(&["tenant".into(), "slug".into()])` is `tenant_and_slug`.
pub(super) fn suffix(key: &[String]) -> String {
    key.iter()
        .map(|name| snake(name))
        .collect::<Vec<_>>()
        .join("_and_")
}