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    #[diesel_test_helper::test]
27    fn regression_json_float_survives_a_round_trip() {
28        use crate::mysql::MysqlType;
29
30        crate::test_helpers::assert_floats_survive_a_json_round_trip::<sql_types::Json, Mysql>(
31            |bytes| {
32                FromSql::<sql_types::Json, Mysql>::from_sql(MysqlValue::new_internal(
33                    bytes,
34                    MysqlType::String,
35                ))
36            },
37        );
38    }
39
40    #[diesel_test_helper::test]
41    fn json_to_sql() {
42        use crate::query_builder::bind_collector::ByteWrapper;
43
44        let mut buffer = Vec::new();
45        let mut bytes = Output::test(ByteWrapper(&mut buffer));
46        let test_json = serde_json::Value::Bool(true);
47        ToSql::<sql_types::Json, Mysql>::to_sql(&test_json, &mut bytes).unwrap();
48        assert_eq!(buffer, b"true");
49    }
50
51    #[diesel_test_helper::test]
52    fn some_json_from_sql() {
53        use crate::mysql::MysqlType;
54        let input_json = b"true";
55        let output_json: serde_json::Value = FromSql::<sql_types::Json, Mysql>::from_sql(
56            MysqlValue::new_internal(input_json, MysqlType::String),
57        )
58        .unwrap();
59        assert_eq!(output_json, serde_json::Value::Bool(true));
60    }
61
62    #[diesel_test_helper::test]
63    fn bad_json_from_sql() {
64        use crate::mysql::MysqlType;
65        let uuid: Result<serde_json::Value, _> = FromSql::<sql_types::Json, Mysql>::from_sql(
66            MysqlValue::new_internal(b"boom", MysqlType::String),
67        );
68        assert_eq!(uuid.unwrap_err().to_string(), "Invalid Json");
69    }
70
71    #[diesel_test_helper::test]
72    fn no_json_from_sql() {
73        let uuid: Result<serde_json::Value, _> =
74            FromSql::<sql_types::Json, Mysql>::from_nullable_sql(None);
75        assert_eq!(
76            uuid.unwrap_err().to_string(),
77            "Unexpected null for non-null column"
78        );
79    }
80}
diesel/mysql_like/types/json.rs

diesel/mysql_like/types/
json.rs
