compact_str/features/
diesel.rs

1#![cfg_attr(docsrs, doc(cfg(feature = "diesel")))]
2
3// Copied and adapted from
4// <https://github.com/diesel-rs/diesel/blob/ab70dd5ed1f96926a3e8d98ab42636eaac1e1594/diesel/src/type_impls/primitives.rs>
5
6use diesel::{backend, deserialize, expression, serialize, sql_types};
7
8use crate::CompactString;
9
10#[derive(expression::AsExpression, deserialize::FromSqlRow)]
11#[diesel(foreign_derive)]
12#[diesel(sql_type = sql_types::Text)]
13#[allow(dead_code)]
14struct CompactStringProxy(CompactString);
15
16impl<ST, DB> deserialize::FromSql<ST, DB> for CompactString
17where
18    DB: backend::Backend,
19    *const str: deserialize::FromSql<ST, DB>,
20{
21    fn from_sql(bytes: DB::RawValue<'_>) -> deserialize::Result<Self> {
22        let str_ptr = <*const str as deserialize::FromSql<ST, DB>>::from_sql(bytes)?;
23        if !str_ptr.is_null() {
24            // SAFETY: We just checked that `str_ptr` is not null, and `from_sql()` should return
25            // a valid pointer to an `str`.
26            let string = unsafe { &*str_ptr };
27            Ok(string.into())
28        } else {
29            Ok(CompactString::new(""))
30        }
31    }
32}
33
34impl<DB> serialize::ToSql<sql_types::Text, DB> for CompactString
35where
36    DB: backend::Backend,
37    str: serialize::ToSql<sql_types::Text, DB>,
38{
39    fn to_sql<'b>(&'b self, out: &mut serialize::Output<'b, '_, DB>) -> serialize::Result {
40        self.as_str().to_sql(out)
41    }
42}
compact_str/features/diesel.rs

compact_str/features/
diesel.rs
