macro_rules! migration {
($name:ident, $id:expr, [ $( $dependency_id:expr ),* $(,)* ], $description:expr) => { ... };
}
Expand description
Create a trivial implementation of Migration
for a type.
Example
#[macro_use]
extern crate schemer;
extern crate uuid;
use schemer::Migration;
struct ParentMigration;
migration!(
ParentMigration,
"bc960dc8-0e4a-4182-a62a-8e776d1e2b30",
[],
"Parent migration in a DAG");
struct ChildMigration;
migration!(
ChildMigration,
"4885e8ab-dafa-4d76-a565-2dee8b04ef60",
["bc960dc8-0e4a-4182-a62a-8e776d1e2b30",],
"Child migration in a DAG");
fn main() {
let parent = ParentMigration;
let child = ChildMigration;
assert!(child.dependencies().contains(&parent.id()));
}