exchange member with a new account and same rank in the ranked collec… (#2587)

closes https://github.com/polkadot-fellows/help-center/issues/1

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: command-bot <>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

cumulus/parachains/runtimes/collectives/collectives-westend/src/ambassador/mod.rs

@@ -34,6 +34,7 @@ mod tracks;
 use super::*;
 use crate::xcm_config::{FellowshipAdminBodyId, LocationToAccountId, WndAssetHub};
 use frame_support::traits::{EitherOf, MapSuccess, TryMapSuccess};
+use frame_system::EnsureRootWithSuccess;
 pub use origins::pallet_origins as pallet_ambassador_origins;
 use origins::pallet_origins::{
 	EnsureAmbassadorsVoice, EnsureAmbassadorsVoiceFrom, EnsureHeadAmbassadorsVoice, Origin,
@@ -99,11 +100,17 @@ pub type PromoteOrigin = EitherOf<
 	>,
 >;
 
+/// Exchange is by any of:
+/// - Root can exchange arbitrarily.
+/// - the Fellows origin
+pub type ExchangeOrigin = EitherOf<EnsureRootWithSuccess<AccountId, ConstU16<65535>>, Fellows>;
+
 impl pallet_ranked_collective::Config<AmbassadorCollectiveInstance> for Runtime {
 	type WeightInfo = weights::pallet_ranked_collective_ambassador_collective::WeightInfo<Runtime>;
 	type RuntimeEvent = RuntimeEvent;
 	type PromoteOrigin = PromoteOrigin;
 	type DemoteOrigin = DemoteOrigin;
+	type ExchangeOrigin = ExchangeOrigin;
 	type Polls = AmbassadorReferenda;
 	type MinRankOfClass = sp_runtime::traits::Identity;
 	type VoteWeight = pallet_ranked_collective::Linear;

cumulus/parachains/runtimes/collectives/collectives-westend/src/fellowship/mod.rs

@@ -136,6 +136,11 @@ impl pallet_ranked_collective::Config<FellowshipCollectiveInstance> for Runtime
 			Replace<ConstU16<{ ranks::DAN_9 }>>,
 		>,
 	>;
+	// Exchange is by any of:
+	// - Root can exchange arbitrarily.
+	// - the Fellows origin
+	type ExchangeOrigin =
+		EitherOf<EnsureRootWithSuccess<Self::AccountId, ConstU16<65535>>, Fellows>;
 	type Polls = FellowshipReferenda;
 	type MinRankOfClass = tracks::MinRankOfClass;
 	type VoteWeight = pallet_ranked_collective::Geometric;

cumulus/parachains/runtimes/collectives/collectives-westend/src/weights/pallet_ranked_collective_ambassador_collective.rs

@@ -174,4 +174,7 @@ impl<T: frame_system::Config> pallet_ranked_collective::WeightInfo for WeightInf
 			.saturating_add(T::DbWeight::get().writes((1_u64).saturating_mul(n.into())))
 			.saturating_add(Weight::from_parts(0, 2550).saturating_mul(n.into()))
 	}
+	fn exchange_member() -> Weight {
+		todo!()
+	}
 }

cumulus/parachains/runtimes/collectives/collectives-westend/src/weights/pallet_ranked_collective_fellowship_collective.rs

@@ -173,4 +173,7 @@ impl<T: frame_system::Config> pallet_ranked_collective::WeightInfo for WeightInf
 			.saturating_add(T::DbWeight::get().writes((1_u64).saturating_mul(n.into())))
 			.saturating_add(Weight::from_parts(0, 2550).saturating_mul(n.into()))
 	}
+	fn exchange_member() -> Weight {
+		todo!()
+	}
 }