diesel/pg/types/
uuid.rs

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1use std::io::prelude::*;
2
3use crate::deserialize::{self, FromSql, FromSqlRow};
4use crate::expression::AsExpression;
5use crate::pg::{Pg, PgValue};
6use crate::serialize::{self, IsNull, Output, ToSql};
7use crate::sql_types::Uuid;
8
9#[derive(AsExpression, FromSqlRow)]
10#[diesel(foreign_derive)]
11#[diesel(sql_type = Uuid)]
12#[allow(dead_code)]
13struct UuidProxy(uuid::Uuid);
14
15#[cfg(all(feature = "postgres_backend", feature = "uuid"))]
16impl FromSql<Uuid, Pg> for uuid::Uuid {
17    fn from_sql(value: PgValue<'_>) -> deserialize::Result<Self> {
18        uuid::Uuid::from_slice(value.as_bytes()).map_err(Into::into)
19    }
20}
21
22#[cfg(all(feature = "postgres_backend", feature = "uuid"))]
23impl ToSql<Uuid, Pg> for uuid::Uuid {
24    fn to_sql<'b>(&'b self, out: &mut Output<'b, '_, Pg>) -> serialize::Result {
25        out.write_all(self.as_bytes())
26            .map(|_| IsNull::No)
27            .map_err(Into::into)
28    }
29}
30
31#[test]
32fn uuid_to_sql() {
33    use crate::query_builder::bind_collector::ByteWrapper;
34
35    let mut buffer = Vec::new();
36    let bytes = [
37        0xFF_u8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
38        0x31, 0x32,
39    ];
40
41    let test_uuid = uuid::Uuid::from_slice(&bytes).unwrap();
42    let mut bytes = Output::test(ByteWrapper(&mut buffer));
43    ToSql::<Uuid, Pg>::to_sql(&test_uuid, &mut bytes).unwrap();
44    assert_eq!(&buffer, test_uuid.as_bytes());
45}
46
47#[test]
48fn some_uuid_from_sql() {
49    let bytes = [
50        0xFF_u8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
51        0x31, 0x32,
52    ];
53    let input_uuid = uuid::Uuid::from_slice(&bytes).unwrap();
54    let output_uuid =
55        <uuid::Uuid as FromSql<Uuid, Pg>>::from_sql(PgValue::for_test(input_uuid.as_bytes()))
56            .unwrap();
57    assert_eq!(input_uuid, output_uuid);
58}
59
60#[test]
61fn bad_uuid_from_sql() {
62    let uuid = uuid::Uuid::from_sql(PgValue::for_test(b"boom"));
63    assert!(uuid.is_err());
64    // The error message changes slightly between different
65    // uuid versions, so we just check on the relevant parts
66    // The exact error messages are either:
67    // "invalid bytes length: expected 16, found 4"
68    // or
69    // "invalid length: expected 16 bytes, found 4"
70    let error_message = uuid.unwrap_err().to_string();
71    assert!(error_message.starts_with("invalid"));
72    assert!(error_message.contains("length"));
73    assert!(error_message.contains("expected 16"));
74    assert!(error_message.ends_with("found 4"));
75}
76
77#[test]
78fn no_uuid_from_sql() {
79    let uuid = uuid::Uuid::from_nullable_sql(None);
80    assert_eq!(
81        uuid.unwrap_err().to_string(),
82        "Unexpected null for non-null column"
83    );
84}
diesel/pg/types/uuid.rs

diesel/pg/types/
uuid.rs
