rustyroad 1.8.7

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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//! Input shapes; e.g. auto-ID-only tables have empty New and Patch inputs.

use super::super::naming::snake;
use crate::database::introspection::{Column, Table};

/// Mirrors New fields; e.g. `new_columns(table)` omits an auto-increment `id`.
pub(super) fn new_columns(table: &Table) -> Vec<&Column> {
    table
        .columns
        .iter()
        .filter(|column| !column.auto_increment)
        .collect()
}

/// Mirrors Patch fields; e.g. `patch_columns(table)` omits even a manual primary key.
pub(super) fn patch_columns(table: &Table) -> Vec<&Column> {
    table
        .columns
        .iter()
        .filter(|column| !table.primary_key.contains(&column.name))
        .collect()
}

/// Recognizes omission; e.g. `optional(column)` is true for a defaulted timestamp.
pub(super) fn optional(column: &Column) -> bool {
    column.nullable || column.default.is_some()
}

/// Joins presence checks; e.g. `present(&[name])` emits `input.name.is_some()`.
pub(super) fn present(columns: &[&Column]) -> String {
    present_from(columns, "input")
}

/// Names the input; e.g. `present_from(&[name], "patch")` checks `patch.name`.
pub(super) fn present_from(columns: &[&Column], input: &str) -> String {
    columns
        .iter()
        .map(|column| format!("{input}.{}.is_some()", snake(&column.name)))
        .collect::<Vec<_>>()
        .join(" || ")
}