diesel/mysql_like/types/
json.rs

1use crate::deserialize::{self, FromSql};
2use crate::mysql_like::{MysqlLikeBackend, MysqlValue};
3use crate::serialize::{self, IsNull, Output, ToSql};
4use crate::sql_types;
5
6#[cfg(feature = "serde_json")]
7impl<DB: MysqlLikeBackend> FromSql<sql_types::Json, DB> for serde_json::Value {
8    fn from_sql(value: MysqlValue<'_>) -> deserialize::Result<Self> {
9        serde_json::from_slice(value.as_bytes()).map_err(|_| "Invalid Json".into())
10    }
11}
12
13#[cfg(feature = "serde_json")]
14impl<DB: MysqlLikeBackend> ToSql<sql_types::Json, DB> for serde_json::Value {
15    fn to_sql<'b>(&'b self, out: &mut Output<'b, '_, DB>) -> serialize::Result {
16        serde_json::to_writer(out, self)
17            .map(|_| IsNull::No)
18            .map_err(Into::into)
19    }
20}
21
22#[cfg(all(test, feature = "mysql"))]
23mod tests {
24    use super::*;
25    use crate::mysql::Mysql;
26    use crate::test_helpers::format_error;
27
28    #[diesel_test_helper::test]
29    fn regression_json_float_survives_a_round_trip() {
30        use crate::mysql::MysqlType;
31
32        crate::test_helpers::assert_floats_survive_a_json_round_trip::<sql_types::Json, Mysql>(
33            |bytes| {
34                FromSql::<sql_types::Json, Mysql>::from_sql(MysqlValue::new_internal(
35                    bytes,
36                    MysqlType::String,
37                ))
38            },
39        );
40    }
41
42    #[diesel_test_helper::test]
43    fn json_to_sql() {
44        use crate::query_builder::bind_collector::ByteWrapper;
45
46        let mut buffer = Vec::new();
47        let mut bytes = Output::test(ByteWrapper(&mut buffer));
48        let test_json = serde_json::Value::Bool(true);
49        ToSql::<sql_types::Json, Mysql>::to_sql(&test_json, &mut bytes).unwrap();
50        assert_eq!(buffer, b"true");
51    }
52
53    #[diesel_test_helper::test]
54    fn some_json_from_sql() {
55        use crate::mysql::MysqlType;
56        let input_json = b"true";
57        let output_json: serde_json::Value = FromSql::<sql_types::Json, Mysql>::from_sql(
58            MysqlValue::new_internal(input_json, MysqlType::String),
59        )
60        .unwrap();
61        assert_eq!(output_json, serde_json::Value::Bool(true));
62    }
63
64    #[diesel_test_helper::test]
65    fn bad_json_from_sql() {
66        use crate::mysql::MysqlType;
67        let uuid: Result<serde_json::Value, _> = FromSql::<sql_types::Json, Mysql>::from_sql(
68            MysqlValue::new_internal(b"boom", MysqlType::String),
69        );
70        assert_eq!(format_error(&*uuid.unwrap_err()), "Invalid Json");
71    }
72
73    #[diesel_test_helper::test]
74    fn no_json_from_sql() {
75        let uuid: Result<serde_json::Value, _> =
76            FromSql::<sql_types::Json, Mysql>::from_nullable_sql(None);
77        assert_eq!(
78            format_error(&*uuid.unwrap_err()),
79            "Unexpected null for non-null column"
80        );
81    }
82}
diesel/mysql_like/types/json.rs

diesel/mysql_like/types/
json.rs
