rustyroad 1.8.0

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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//! Operation definitions for declarative migrations.

use serde::{Deserialize, Serialize};

/// Adds a column to an existing table.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct AddColumn {
    pub table: String,
    pub column: String,
    /// SQL type of the new column.
    #[serde(rename = "type")]
    pub column_type: String,
    #[serde(default)]
    pub nullable: bool,
    #[serde(default)]
    pub default: Option<String>,
    /// Expression populating existing rows, evaluated per row.
    #[serde(default)]
    pub up: Option<String>,
}

/// Alters an existing column.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct AlterColumn {
    pub table: String,
    pub column: String,
    /// New logical name, when renaming.
    #[serde(default)]
    pub name: Option<String>,
    /// New SQL type, when changing type.
    #[serde(default, rename = "type")]
    pub column_type: Option<String>,
    #[serde(default)]
    pub nullable: Option<bool>,
    /// Expression converting old values to new, for readers of the new version.
    #[serde(default)]
    pub up: Option<String>,
    /// Expression converting new values back, for readers of the old version.
    #[serde(default)]
    pub down: Option<String>,
}

/// Drops a column.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct DropColumn {
    pub table: String,
    pub column: String,
    /// Expression keeping the column populated for old readers until completion.
    #[serde(default)]
    pub down: Option<String>,
}

/// Raw SQL escape hatch.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct RawSql {
    pub up: String,
    #[serde(default)]
    pub down: Option<String>,
}