Hi ,
We have api in golang . where customer want json should be as in table filed order .
Which we have tried in golang . it is not possible.
we want to migrate same api in rust to solve that issue.
Please guide us it is possible.
Example : table : emp
. empcode,empname,age,desg,sal,add
json should be in same order
{
empocde:,
empname: ,
age : 10,
desg: ,
sal : ,
add :
}
JSON objects are unordered by specification, so probably no implementation will guarantee that.
serde_json has a preserve_order feature that will preserve insertion order for values constructed manually.
It won't necessarily automatically make all of the serde_json API do what you want though, you may have to do some things manually.
preserve_order feature replace hashmaps in serde_json::Value enum with indexmap. You should not use this enum if you know the structure of the JSON.
Practically JSON string produces by serde_json from #[derive(Serialize)] struct reflects the ordering of the struct declaration itself. I'm not sure it's guaranteed but it's pretty stable. You can add some test yourself for extra safety.