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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//! Shadow column promotion and discard at completion.

use super::super::duplicate::Duplicate;
use super::super::Plan;

impl Plan {
    /// Replaces each original column with its shadow.
    pub(super) fn promote_shadows(&self) -> Vec<String> {
        self.promotions
            .iter()
            .flat_map(|(table, column)| duplicate(table, column).promote())
            .collect()
    }

    /// Removes every shadow column, used on rollback.
    pub(super) fn discard_shadows(&self) -> Vec<String> {
        self.promotions
            .iter()
            .map(|(table, column)| duplicate(table, column).discard())
            .collect()
    }
}

/// Builds a duplicator for an existing column.
///
/// Nullability and type are irrelevant here: promotion and discard act on names.
fn duplicate<'a>(table: &'a str, column: &'a str) -> Duplicate<'a> {
    Duplicate {
        table,
        column,
        column_type: None,
        nullable: true,
        default: None,
    }
}