rustyroad 1.8.6

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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//! Ordered field fragments; e.g. omitted optional inputs emit neither names nor binds.

use super::super::naming::{snake, sql};
use super::inputs::optional;
use crate::database::introspection::Column;

/// Pairs insert fragments; e.g. `insert(&[name])` returns matching name/bind blocks.
pub(super) fn insert(columns: &[&Column]) -> (String, String) {
    let (names, values): (Vec<_>, Vec<_>) = columns
        .iter()
        .map(|column| (column_push(column), value_push(column)))
        .unzip();
    (names.join("\n"), values.join("\n"))
}

/// Emits an insert name; e.g. `column_push(name)` guards optional `input.name`.
fn column_push(column: &Column) -> String {
    let field = snake(&column.name);
    let push = format!("columns.push({:?});", sql(&column.name));
    if optional(column) {
        format!("        if input.{field}.is_some() {{\n            {push}\n        }}")
    } else {
        format!("        {push}")
    }
}

/// Emits a matching bind; e.g. `value_push(name)` borrows `input.name` without moving it.
fn value_push(column: &Column) -> String {
    let field = snake(&column.name);
    if optional(column) {
        format!(
            "        if let Some(value) = input.{field}.as_ref() {{\n            values.push_bind(value);\n        }}"
        )
    } else {
        format!("        values.push_bind(&input.{field});")
    }
}

/// Emits a patch assignment; e.g. `assignment(name)` binds only `Some` inputs.
pub(super) fn assignment(column: &Column) -> String {
    assignment_from(column, "input")
}

/// Names the Patch binding; e.g. `assignment_from(name, "patch")` reads `patch.name`.
pub(super) fn assignment_from(column: &Column, input: &str) -> String {
    let field = snake(&column.name);
    let assignment = format!("{} = ", sql(&column.name));
    format!(
        "        if let Some(value) = {input}.{field}.as_ref() {{\n\
             set.push({assignment:?}).push_bind_unseparated(value);\n\
         }}"
    )
}