diesel_sqlite_struct_json_text/
lib.rs

1use proc_macro::{TokenStream};
2use syn::{parse_macro_input, DeriveInput};
3use quote::quote;
4
5#[proc_macro_attribute]
6pub fn diesel_sqlite_struct_json_text(_args: TokenStream, input: TokenStream) -> TokenStream {
7    let input = parse_macro_input!(input as DeriveInput);
8    let name = &input.ident;
9
10    return quote!{
11        #[derive(Debug, diesel::FromSqlRow, diesel::AsExpression, serde::Serialize, serde::Deserialize)]
12        #[diesel(sql_type = diesel::sql_types::Text)]
13        #input
14
15        impl diesel::serialize::ToSql<diesel::sql_types::Text, diesel::sqlite::Sqlite> for #name {
16            fn to_sql<'b>(&'b self, out: &mut diesel::serialize::Output<'b, '_, diesel::sqlite::Sqlite>) -> diesel::serialize::Result {
17                let json = serde_json::to_string(self).unwrap();
18                out.set_value(json);
19                Ok(diesel::serialize::IsNull::No)                
20            }
21        }
22
23        impl diesel::deserialize::FromSql<diesel::sql_types::Text, diesel::sqlite::Sqlite> for #name {
24            fn from_sql(bytes: diesel::sqlite::SqliteValue<'_, '_, '_>) -> diesel::deserialize::Result<Self> {
25                let value = <String as diesel::deserialize::FromSql<diesel::sql_types::Text, diesel::sqlite::Sqlite>>::from_sql(bytes)?;
26                Ok(serde_json::from_str(&value).unwrap())
27            }
28        }
29    }.into();
30}
diesel_sqlite_struct_json_text/lib.rs

diesel_sqlite_struct_json_text/
lib.rs
