pallet-core-fellowship: import an unimported member on approve (#2883)

To align with the documentation of the approve call, we import an
unimported member on approval.

No changes have been made to the benchmarks as they already cover the
worst-case scenario.

prdoc/pr_2883.prdoc

@@ -0,0 +1,9 @@
+title: "pallet-core-fellowship: import an unimported on approve"
+
+doc:
+  - audience: Runtime User
+    description: |
+      To align with the documentation of the approve call, we import an untracked member on approval.
+
+crates:
+  - name: "pallet-core-fellowship"

substrate/frame/core-fellowship/src/lib.rs

@@ -382,7 +382,11 @@ pub mod pallet {
 			ensure!(at_rank > 0, Error::<T, I>::InvalidRank);
 			let rank = T::Members::rank_of(&who).ok_or(Error::<T, I>::Unranked)?;
 			ensure!(rank == at_rank, Error::<T, I>::UnexpectedRank);
-			let mut member = Member::<T, I>::get(&who).ok_or(Error::<T, I>::NotTracked)?;
+			let mut member = if let Some(m) = Member::<T, I>::get(&who) {
+				m
+			} else {
+				Self::import_member(who.clone(), rank)
+			};
 
 			member.last_proof = frame_system::Pallet::<T>::block_number();
 			Member::<T, I>::insert(&who, &member);
@@ -518,13 +522,7 @@ pub mod pallet {
 			let who = ensure_signed(origin)?;
 			ensure!(!Member::<T, I>::contains_key(&who), Error::<T, I>::AlreadyInducted);
 			let rank = T::Members::rank_of(&who).ok_or(Error::<T, I>::Unranked)?;
-
-			let now = frame_system::Pallet::<T>::block_number();
-			Member::<T, I>::insert(
-				&who,
-				MemberStatus { is_active: true, last_promotion: 0u32.into(), last_proof: now },
-			);
-			Self::deposit_event(Event::<T, I>::Imported { who, rank });
+			let _ = Self::import_member(who, rank);
 
 			Ok(Pays::No.into())
 		}
@@ -548,6 +546,18 @@ pub mod pallet {
 				Self::deposit_event(e);
 			}
 		}
+
+		fn import_member(who: T::AccountId, rank: RankOf<T, I>) -> MemberStatusOf<T> {
+			let now = frame_system::Pallet::<T>::block_number();
+			let status = MemberStatus {
+				is_active: true,
+				last_promotion: BlockNumberFor::<T>::zero(),
+				last_proof: now,
+			};
+			Member::<T, I>::insert(&who, status.clone());
+			Self::deposit_event(Event::<T, I>::Imported { who, rank });
+			status
+		}
 	}
 
 	impl<T: Config<I>, I: 'static> GetSalary<RankOf<T, I>, T::AccountId, T::Balance> for Pallet<T, I> {

substrate/frame/core-fellowship/src/tests.rs

@@ -378,3 +378,11 @@ fn active_changing_get_salary_works() {
 		}
 	});
 }
+
+#[test]
+fn approve_imports_not_tracked_member() {
+	new_test_ext().execute_with(|| {
+		set_rank(10, 5);
+		assert_ok!(CoreFellowship::approve(signed(5), 10, 5));
+	});
+}