tank_core/
relations.rs

1use crate::{ColumnDef, Entity, TableRef};
2use rust_decimal::Decimal;
3use std::{hash::Hash, marker::PhantomData};
4
5/// Decimal wrapper enforcing static precision/scale.
6///
7/// `WIDTH` = total digits, `SCALE` = fractional digits.
8#[derive(Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
9pub struct FixedDecimal<const WIDTH: u8, const SCALE: u8>(pub Decimal);
10
11impl<const W: u8, const S: u8> From<Decimal> for FixedDecimal<W, S> {
12    fn from(value: Decimal) -> Self {
13        Self(value)
14    }
15}
16
17impl<const W: u8, const S: u8> From<FixedDecimal<W, S>> for Decimal {
18    fn from(value: FixedDecimal<W, S>) -> Self {
19        value.0
20    }
21}
22
23/// Represents a foreign key constraint to another entity.
24pub struct References<T: Entity> {
25    entity: PhantomData<T>,
26    columns: Box<[ColumnDef]>,
27}
28
29impl<T: Entity> References<T> {
30    pub fn new(columns: Box<[ColumnDef]>) -> Self {
31        Self {
32            columns,
33            entity: Default::default(),
34        }
35    }
36    pub fn table_ref(&self) -> TableRef {
37        T::table().clone()
38    }
39    pub fn columns(&self) -> &[ColumnDef] {
40        &self.columns
41    }
42}
tank_core/relations.rs

tank_core/
relations.rs
