fix trigger

cozo-core/src/query/stored.rs

@@ -447,7 +447,9 @@ fn make_const_rule(
         rule_symbol.clone(),
         InputInlineRulesOrAlgo::Algo {
             algo: AlgoApply {
-                algo: AlgoHandle { name: rule_symbol },
+                algo: AlgoHandle {
+                    name: Symbol::new("Constant", Default::default()),
+                },
                 rule_args: vec![],
                 options,
                 head: bindings,

cozo-core/src/runtime/relation.rs

@@ -430,3 +430,45 @@ pub(crate) struct InsufficientAccessLevel(
     pub(crate) String,
     pub(crate) AccessLevel,
 );
+
+#[cfg(test)]
+mod tests {
+    use serde_json::json;
+    use crate::new_cozo_mem;
+
+    #[test]
+    fn test_trigger() {
+        let db = new_cozo_mem().unwrap();
+        db.run_script(":create friends {fr: Int, to: Int}", Default::default())
+            .unwrap();
+        db.run_script(":create friends.rev {to: Int, fr: Int}", Default::default())
+            .unwrap();
+        db.run_script(r#"
+        ::set_triggers friends
+
+        on put {
+            ?[fr, to] := _new[fr, to]
+
+            :put friends.rev{ to, fr }
+        }
+        on rm {
+            ?[fr, to] := _old[fr, to]
+
+            :rm friends.rev{ to, fr }
+        }
+        "#, Default::default()).unwrap();
+        db.run_script(
+            r"?[fr, to] <- [[1,2]] :put friends {fr, to}",
+            Default::default(),
+        )
+        .unwrap();
+        let ret = db
+            .export_relations(["friends", "friends.rev"].into_iter())
+            .unwrap();
+        let frs = ret.get("friends").unwrap();
+        assert_eq!(vec![json!(1), json!(2)], frs.rows[0]);
+
+        let frs_rev = ret.get("friends.rev").unwrap();
+        assert_eq!(vec![json!(2), json!(1)], frs_rev.rows[0]);
+    }
+}