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https://github.com/salsa-rs/salsa.git
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5b8464c4f9
This adds initial support for on-demand inputs by allowing new inputs to be created with only a shared reference to the database. This allows creating new inputs during a revision and therefore from inside tracked functions.
52 lines
1.1 KiB
Rust
52 lines
1.1 KiB
Rust
//! Test that a setting a field on a `#[salsa::input]`
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//! overwrites and returns the old value.
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use salsa_2022_tests::{HasLogger, Logger};
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use test_log::test;
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#[salsa::jar(db = Db)]
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struct Jar(MyInput);
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trait Db: salsa::DbWithJar<Jar> + HasLogger {}
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#[salsa::input(jar = Jar)]
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struct MyInput {
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field: String,
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}
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#[salsa::db(Jar)]
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#[derive(Default)]
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struct Database {
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storage: salsa::Storage<Self>,
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logger: Logger,
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}
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impl salsa::Database for Database {}
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impl Db for Database {}
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impl HasLogger for Database {
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fn logger(&self) -> &Logger {
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&self.logger
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}
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}
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#[test]
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fn execute() {
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let mut db = Database::default();
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let input = MyInput::new(&db, "Hello".to_string());
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// Overwrite field with an empty String
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// and store the old value in my_string
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let mut my_string = input.set_field(&mut db).to(String::new());
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my_string.push_str(" World!");
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// Set the field back to out initial String,
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// expecting to get the empty one back
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assert_eq!(input.set_field(&mut db).to(my_string), "");
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// Check if the stored String is the one we expected
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assert_eq!(input.field(&db), "Hello World!");
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}
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