rustyroad 1.7.0

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.
Documentation 
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//! Attaching constraints to their tables.

use super::super::model::{ForeignKey, Index, Schema, Unique};
use super::parts::{FkParts, Grouped, IndexParts};
use std::collections::BTreeMap;

/// Attaches primary key columns to their tables.
pub(crate) fn primary_keys(schema: &mut Schema, rows: Vec<(String, String)>) {
    for (table_name, column) in rows {
        if let Some(table) = schema.tables.iter_mut().find(|t| t.name == table_name) {
            table.primary_key.push(column);
        }
    }
}

/// Attaches unique constraints, grouped by constraint name.
pub(crate) fn uniques(schema: &mut Schema, grouped: Grouped) {
    for (name, (table_name, columns)) in grouped {
        if let Some(table) = schema.tables.iter_mut().find(|t| t.name == table_name) {
            table.uniques.push(Unique { name, columns });
        }
    }
}

/// Attaches indexes, grouped by index name.
pub(crate) fn indexes(schema: &mut Schema, grouped: BTreeMap<String, IndexParts>) {
    for (name, parts) in grouped {
        if let Some(table) = schema.tables.iter_mut().find(|t| t.name == parts.table) {
            table.indexes.push(Index {
                name,
                columns: parts.columns,
                unique: parts.unique,
            });
        }
    }
}

/// Attaches foreign keys, grouped by constraint name.
pub(crate) fn foreign_keys(schema: &mut Schema, grouped: BTreeMap<String, FkParts>) {
    for (name, parts) in grouped {
        if let Some(table) = schema.tables.iter_mut().find(|t| t.name == parts.table) {
            table.foreign_keys.push(ForeignKey {
                name,
                columns: parts.columns,
                foreign_table: parts.foreign_table,
                foreign_columns: parts.foreign_columns,
                on_delete: parts.on_delete,
                on_update: parts.on_update,
            });
        }
    }
}