rustyroad 1.7.4

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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//! `update.rs` generation: the update.

mod statement;

use crate::database::introspection::Schema;
use crate::generators::rust::model::Model;

/// Renders the update submodule.
pub fn render(model: &Model, schema: &Schema) -> String {
    let Some(key) = model.key() else {
        return unsupported(
            model,
            "a single-column primary key is needed to address the row to update",
        );
    };

    let writable = model.updatable();
    if writable.is_empty() {
        return unsupported(model, "every column is either the key or database-assigned");
    }

    statement::render(model, key, &writable, schema)
}

/// Renders a placeholder explaining why no update was generated.
///
/// An empty file would look like an oversight; stating the reason in the generated output
/// puts the explanation where the developer is already looking.
fn unsupported(model: &Model, reason: &str) -> String {
    format!(
        "//! No update was generated for `{}`: {reason}.\n\
         //!\n\
         //! Add one here if the table needs it; this file is regenerated, so prefer\n\
         //! a sibling module for code you intend to keep.\n",
        model.table
    )
}