rustyroad 1.7.3

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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//! One column, resolved into the field that represents it.

use crate::generators::rust::types::Mapping;

/// A column resolved into the field that represents it.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Field {
    /// The column name as it exists in the database.
    pub column: String,
    /// The field name in Rust, including any `r#` prefix.
    pub ident: String,
    /// The `serde`/`sqlx` rename needed to reach the column, when it differs.
    pub rename: Option<String>,
    /// The resolved Rust type.
    pub mapping: Mapping,
    /// True when the column is part of the primary key.
    pub primary_key: bool,
    /// True when the database supplies the value, via a sequence or identity.
    pub generated: bool,
    pub nullable: bool,
}

impl Field {
    /// Returns the non-null type used when this field addresses a row.
    ///
    /// PostgreSQL reports projected view columns as nullable even when an `id` expression is
    /// never null. A lookup value itself cannot be absent, so keyed method and route parameters
    /// use the inner type while the row field preserves the catalog's `Option<_>` shape.
    pub fn key_type(&self) -> &str {
        self.mapping
            .rust
            .strip_prefix("Option<")
            .and_then(|rest| rest.strip_suffix('>'))
            .unwrap_or(&self.mapping.rust)
    }

    /// Returns `true` when a caller supplies this field on insert.
    ///
    /// A sequence-backed key and the audit timestamps are set by the database, so
    /// binding them from a struct would either fail or overwrite the server clock.
    pub fn insertable(&self) -> bool {
        !self.generated && !self.timestamp()
    }

    /// Returns `true` when this field is updated by an `UPDATE`.
    ///
    /// The key identifies the row rather than being written, and the audit timestamps
    /// are handled by the statement: `updated_at` is set to the server clock, and
    /// binding it as well would assign the column twice in one `SET`, which Postgres
    /// rejects.
    pub fn updatable(&self) -> bool {
        !self.primary_key && !self.generated && !self.timestamp()
    }

    /// Returns `true` when the column is an audit timestamp the database maintains.
    fn timestamp(&self) -> bool {
        matches!(self.column.as_str(), "created_at" | "updated_at")
    }
}