tank_core/
relations.rs

1use crate::{AsValue, ColumnDef, Entity, TableRef};
2use rust_decimal::Decimal;
3use std::{marker::PhantomData, mem};
4
5#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
6pub struct FixedDecimal<const WIDTH: u8, const SCALE: u8>(pub Decimal);
7
8impl<const W: u8, const S: u8> From<Decimal> for FixedDecimal<W, S> {
9    fn from(value: Decimal) -> Self {
10        Self(value)
11    }
12}
13
14impl<const W: u8, const S: u8> From<FixedDecimal<W, S>> for Decimal {
15    fn from(value: FixedDecimal<W, S>) -> Self {
16        value.0
17    }
18}
19
20#[derive(Debug, Default)]
21pub enum Passive<T: AsValue> {
22    Set(T),
23    #[default]
24    NotSet,
25}
26
27impl<T: AsValue> Passive<T> {
28    pub fn expect(self, msg: &str) -> T {
29        match self {
30            Passive::Set(v) => v,
31            Passive::NotSet => panic!("{}", msg),
32        }
33    }
34    pub fn unwrap(self) -> T {
35        match self {
36            Passive::Set(v) => v,
37            Passive::NotSet => panic!("called `Passive::unwrap()` on a `NotSet` value"),
38        }
39    }
40}
41
42impl<T: AsValue + PartialEq> PartialEq for Passive<T> {
43    fn eq(&self, other: &Self) -> bool {
44        match (self, other) {
45            (Self::Set(lhs), Self::Set(rhs)) => lhs == rhs,
46            _ => mem::discriminant(self) == mem::discriminant(other),
47        }
48    }
49}
50
51impl<T: AsValue + Clone> Clone for Passive<T>
52where
53    T: Clone,
54{
55    fn clone(&self) -> Self {
56        match self {
57            Self::Set(v) => Self::Set(v.clone()),
58            Self::NotSet => Self::NotSet,
59        }
60    }
61}
62
63impl<T: AsValue> From<T> for Passive<T> {
64    fn from(value: T) -> Self {
65        Self::Set(value)
66    }
67}
68
69pub struct References<T: Entity> {
70    entity: PhantomData<T>,
71    columns: Box<[ColumnDef]>,
72}
73
74impl<T: Entity> References<T> {
75    pub fn new(columns: Box<[ColumnDef]>) -> Self {
76        Self {
77            columns,
78            entity: Default::default(),
79        }
80    }
81    pub fn table_ref(&self) -> TableRef {
82        T::table_ref().clone()
83    }
84    pub fn columns(&self) -> &[ColumnDef] {
85        &self.columns
86    }
87}
tank_core/relations.rs

tank_core/
relations.rs
