diesel/mysql/types/
json.rs1use crate::deserialize::{self, FromSql};
2use crate::mysql::{Mysql, MysqlValue};
3use crate::serialize::{self, IsNull, Output, ToSql};
4use crate::sql_types;
5
6#[cfg(all(feature = "mysql_backend", feature = "serde_json"))]
7impl FromSql<sql_types::Json, Mysql> 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(all(feature = "mysql_backend", feature = "serde_json"))]
14impl ToSql<sql_types::Json, Mysql> for serde_json::Value {
15 fn to_sql<'b>(&'b self, out: &mut Output<'b, '_, Mysql>) -> serialize::Result {
16 serde_json::to_writer(out, self)
17 .map(|_| IsNull::No)
18 .map_err(Into::into)
19 }
20}
21
22#[cfg(test)]
23mod tests {
24 use super::*;
25 #[diesel_test_helper::test]
26 fn json_to_sql() {
27 use crate::query_builder::bind_collector::ByteWrapper;
28
29 let mut buffer = Vec::new();
30 let mut bytes = Output::test(ByteWrapper(&mut buffer));
31 let test_json = serde_json::Value::Bool(true);
32 ToSql::<sql_types::Json, Mysql>::to_sql(&test_json, &mut bytes).unwrap();
33 assert_eq!(buffer, b"true");
34 }
35
36 #[diesel_test_helper::test]
37 fn some_json_from_sql() {
38 use crate::mysql::MysqlType;
39 let input_json = b"true";
40 let output_json: serde_json::Value = FromSql::<sql_types::Json, Mysql>::from_sql(
41 MysqlValue::new_internal(input_json, MysqlType::String),
42 )
43 .unwrap();
44 assert_eq!(output_json, serde_json::Value::Bool(true));
45 }
46
47 #[diesel_test_helper::test]
48 fn bad_json_from_sql() {
49 use crate::mysql::MysqlType;
50 let uuid: Result<serde_json::Value, _> = FromSql::<sql_types::Json, Mysql>::from_sql(
51 MysqlValue::new_internal(b"boom", MysqlType::String),
52 );
53 assert_eq!(uuid.unwrap_err().to_string(), "Invalid Json");
54 }
55
56 #[diesel_test_helper::test]
57 fn no_json_from_sql() {
58 let uuid: Result<serde_json::Value, _> =
59 FromSql::<sql_types::Json, Mysql>::from_nullable_sql(None);
60 assert_eq!(
61 uuid.unwrap_err().to_string(),
62 "Unexpected null for non-null column"
63 );
64 }
65}