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Adding single test
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89
diesel_derives/tests/as_expression.rs
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89
diesel_derives/tests/as_expression.rs
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@ -0,0 +1,89 @@
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use diesel::backend::Backend;
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use diesel::deserialize::FromSql;
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use diesel::expression::AsExpression;
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use diesel::serialize::{Output, ToSql};
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use diesel::*;
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use std::convert::TryInto;
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use std::io::Write;
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use helpers::connection;
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table! {
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my_structs (foo) {
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foo -> Integer,
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bar -> Text,
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}
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}
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use diesel::sql_types::Text;
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#[derive(Debug, AsExpression, FromSqlRow, Clone, Copy, PartialEq)]
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#[sql_type = "Text"]
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struct StringArray<const N: usize>(pub [u8; N]);
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impl<DB, const N: usize> FromSql<Text, DB> for StringArray<N>
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where
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DB: Backend,
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String: FromSql<Text, DB>,
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{
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fn from_sql(bytes: backend::RawValue<DB>) -> deserialize::Result<Self> {
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let string = <String as FromSql<Text, DB>>::from_sql(bytes)?;
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let bytes_array: [u8; N] = string.into_bytes().try_into().unwrap();
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Ok(StringArray(bytes_array))
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}
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}
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impl<DB, const N: usize> ToSql<Text, DB> for StringArray<N>
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where
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DB: Backend,
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String: ToSql<Text, DB>,
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{
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fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> serialize::Result {
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let string = std::str::from_utf8(&self.0).unwrap().to_owned();
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string.to_sql(out)
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}
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}
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#[test]
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fn struct_with_sql_type() {
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#[derive(Debug, Clone, PartialEq, Queryable, Selectable)]
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#[table_name = "my_structs"]
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struct MyStruct {
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foo: i32,
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bar: StringArray<4>,
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}
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let conn = &mut connection();
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let data = my_structs::table
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.select(MyStruct::as_select())
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.get_result(conn);
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assert!(data.is_err());
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}
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// #[test]
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// #[cfg(all(feature = "postgres", not(feature = "sqlite"), not(feature = "mysql")))]
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// fn test_generic_array_type() {
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// #[derive(Debug, Clone, PartialEq, Queryable)]
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// struct MySqlItem {
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// foo: StringArray<2>,
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// bar: i32,
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// }
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// let new_generic_array_expression = GenericArray([4.4, 4.4]);
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// let conn = &mut connection();
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// let data = select(sql::<(Array<Float8>, Integer)>("[1, 2], 2")).get_result(conn);
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// assert_eq!(
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// Ok(MySqlItem {
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// foo: StringArray([29, 1]),
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// bar: 2
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// }),
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// data
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// );
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// }
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// ::<dyn Expression<SqlType = Array<Float8>>>
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// use diesel::sql_types::{Array, Float8};
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// #[derive(Debug, AsExpression, Clone, Copy, PartialEq)]
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// #[sql_type = "Array<Float8>"]
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// struct GenericArray<T, const N: usize>(pub [T; N]);
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@ -15,3 +15,5 @@ mod insertable;
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mod queryable;
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mod queryable_by_name;
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mod selectable;
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mod as_expression;
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