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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//! Shared dynamic INSERT prefix for atomic writes; uses the existing New input rules.

use super::super::naming::sql;
use super::{fields, inputs};
use crate::database::introspection::Table;

/// Emits insert construction; e.g. omitted timestamp fields use database defaults.
/// Call only with a nonempty New shape; `atomic::render(table, schema)` enforces this.
pub(super) fn render(table: &Table) -> String {
    let columns = inputs::new_columns(table);
    let has_values = if columns.iter().any(|column| !inputs::optional(column)) {
        "true".to_string()
    } else {
        inputs::present(&columns)
    };
    let (column_pushes, value_pushes) = fields::insert(&columns);
    let prefix = format!("INSERT INTO {} AS {} ", sql(&table.name), sql("existing"));
    format!(
        "    let mut query = QueryBuilder::<Postgres>::new({prefix:?});\n\
             if {has_values} {{\n\
                 query.push(\"(\");\n\
                 {{\n\
                     let mut columns = query.separated(\", \");\n\
         {column_pushes}\n\
                 }}\n\
                 query.push(\") VALUES (\");\n\
                 {{\n\
                     let mut values = query.separated(\", \");\n\
         {value_pushes}\n\
                 }}\n\
                 query.push(\")\");\n\
             }} else {{\n\
                 query.push(\"DEFAULT VALUES\");\n\
             }}\n"
    )
}