surrealdb_sql/
cast.rs

1use crate::ctx::Context;
2use crate::dbs::{Options, Transaction};
3use crate::doc::CursorDoc;
4use crate::err::Error;
5use crate::{Idiom, Kind, Value};
6use async_recursion::async_recursion;
7use revision::revisioned;
8use serde::{Deserialize, Serialize};
9use std::cmp::Ordering;
10use std::fmt;
11
12pub(crate) const TOKEN: &str = "$surrealdb::private::crate::Cast";
13
14#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
15#[serde(rename = "$surrealdb::private::crate::Cast")]
16#[revisioned(revision = 1)]
17pub struct Cast(pub Kind, pub Value);
18
19impl PartialOrd for Cast {
20	#[inline]
21	fn partial_cmp(&self, _: &Self) -> Option<Ordering> {
22		None
23	}
24}
25
26impl Cast {
27	/// Convert cast to a field name
28	pub fn to_idiom(&self) -> Idiom {
29		self.1.to_idiom()
30	}
31}
32
33impl Cast {
34	#[cfg_attr(not(target_arch = "wasm32"), async_recursion)]
35	#[cfg_attr(target_arch = "wasm32", async_recursion(?Send))]
36	pub(crate) async fn compute(
37		&self,
38		ctx: &Context<'_>,
39		opt: &Options,
40		txn: &Transaction,
41		doc: Option<&'async_recursion CursorDoc<'_>>,
42	) -> Result<Value, Error> {
43		// Compute the value to be cast and convert it
44		self.1.compute(ctx, opt, txn, doc).await?.convert_to(&self.0)
45	}
46}
47
48impl fmt::Display for Cast {
49	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
50		write!(f, "<{}> {}", self.0, self.1)
51	}
52}