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

diesel/mysql_like/types/
json.rs
