Do not use Option to wrap GenesisConfig fields (#8275)

Currently we wrap every `GenesisConfig` field in an `Option`, while
we require `Default` being implemented for all pallet genesisconfigs.
Passing `None` also results in the genesis not being initialized, which
is a bug as seen from the perspective of a pallet developer?

This pr changes the fields of the `GenesisConfig` to non `Option` types.

substrate/frame/collective/src/lib.rs

@@ -1054,15 +1054,15 @@ mod tests {
 
 	pub fn new_test_ext() -> sp_io::TestExternalities {
 		let mut ext: sp_io::TestExternalities = GenesisConfig {
-			collective_Instance1: Some(collective::GenesisConfig {
+			collective_Instance1: collective::GenesisConfig {
 				members: vec![1, 2, 3],
 				phantom: Default::default(),
-			}),
-			collective_Instance2: Some(collective::GenesisConfig {
+			},
+			collective_Instance2: collective::GenesisConfig {
 				members: vec![1, 2, 3, 4, 5],
 				phantom: Default::default(),
-			}),
-			collective: None,
+			},
+			collective: Default::default(),
 		}.build_storage().unwrap().into();
 		ext.execute_with(|| System::set_block_number(1));
 		ext

substrate/frame/elections-phragmen/src/lib.rs

@@ -1245,7 +1245,7 @@ mod tests {
 		pub fn build_and_execute(self, test: impl FnOnce() -> ()) {
 			MEMBERS.with(|m| *m.borrow_mut() = self.genesis_members.iter().map(|(m, _)| m.clone()).collect::<Vec<_>>());
 			let mut ext: sp_io::TestExternalities = GenesisConfig {
-				pallet_balances: Some(pallet_balances::GenesisConfig::<Test>{
+				pallet_balances: pallet_balances::GenesisConfig::<Test>{
 					balances: vec![
 						(1, 10 * self.balance_factor),
 						(2, 20 * self.balance_factor),
@@ -1254,10 +1254,10 @@ mod tests {
 						(5, 50 * self.balance_factor),
 						(6, 60 * self.balance_factor)
 					],
-				}),
-				elections_phragmen: Some(elections_phragmen::GenesisConfig::<Test> {
+				},
+				elections_phragmen: elections_phragmen::GenesisConfig::<Test> {
 					members: self.genesis_members
-				}),
+				},
 			}.build_storage().unwrap().into();
 			ext.execute_with(pre_conditions);
 			ext.execute_with(test);

substrate/frame/elections/src/mock.rs

@@ -194,7 +194,7 @@ impl ExtBuilder {
 		PRESENT_SLASH_PER_VOTER.with(|v| *v.borrow_mut() = self.bad_presentation_punishment);
 		DECAY_RATIO.with(|v| *v.borrow_mut() = self.decay_ratio);
 		let mut ext: sp_io::TestExternalities = GenesisConfig {
-			pallet_balances: Some(pallet_balances::GenesisConfig::<Test>{
+			pallet_balances: pallet_balances::GenesisConfig::<Test>{
 				balances: vec![
 					(1, 10 * self.balance_factor),
 					(2, 20 * self.balance_factor),
@@ -203,13 +203,13 @@ impl ExtBuilder {
 					(5, 50 * self.balance_factor),
 					(6, 60 * self.balance_factor)
 				],
-			}),
-			elections: Some(elections::GenesisConfig::<Test>{
+			},
+			elections: elections::GenesisConfig::<Test>{
 				members: vec![],
 				desired_seats: self.desired_seats,
 				presentation_duration: 2,
 				term_duration: 5,
-			}),
+			},
 		}.build_storage().unwrap().into();
 		ext.execute_with(|| System::set_block_number(1));
 		ext

substrate/frame/example/src/lib.rs

@@ -814,14 +814,14 @@ mod tests {
 	pub fn new_test_ext() -> sp_io::TestExternalities {
 		let t = GenesisConfig {
 			// We use default for brevity, but you can configure as desired if needed.
-			frame_system: Some(Default::default()),
-			pallet_balances: Some(Default::default()),
-			pallet_example: Some(pallet_example::GenesisConfig {
+			frame_system: Default::default(),
+			pallet_balances: Default::default(),
+			pallet_example: pallet_example::GenesisConfig {
 				dummy: 42,
 				// we configure the map with (key, value) pairs.
 				bar: vec![(1, 2), (2, 3)],
 				foo: 24,
-			}),
+			},
 		}.build_storage().unwrap();
 		t.into()
 	}

substrate/frame/support/src/genesis_config.rs

@@ -82,7 +82,7 @@ macro_rules! impl_outer_config {
 			#[serde(deny_unknown_fields)]
 			pub struct $main {
 				$(
-					pub [< $snake $(_ $instance )? >]: Option<$config>,
+					pub [< $snake $(_ $instance )? >]: $config,
 				)*
 			}
 			#[cfg(any(feature = "std", test))]
@@ -92,15 +92,13 @@ macro_rules! impl_outer_config {
 					storage: &mut $crate::sp_runtime::Storage,
 				) -> std::result::Result<(), String> {
 					$(
-						if let Some(ref extra) = self.[< $snake $(_ $instance )? >] {
-							$crate::impl_outer_config! {
-								@CALL_FN
-								$concrete;
-								$snake;
-								$( $instance )?;
-								extra;
-								storage;
-							}
+						$crate::impl_outer_config! {
+							@CALL_FN
+							$concrete;
+							$snake;
+							$( $instance )?;
+							&self.[< $snake $(_ $instance )? >];
+							storage;
 						}
 					)*
 
@@ -117,7 +115,7 @@ macro_rules! impl_outer_config {
 		$runtime:ident;
 		$module:ident;
 		$instance:ident;
-		$extra:ident;
+		$extra:expr;
 		$storage:ident;
 	) => {
 		$crate::sp_runtime::BuildModuleGenesisStorage::<$runtime, $module::$instance>::build_module_genesis_storage(
@@ -129,7 +127,7 @@ macro_rules! impl_outer_config {
 		$runtime:ident;
 		$module:ident;
 		;
-		$extra:ident;
+		$extra:expr;
 		$storage:ident;
 	) => {
 		$crate::sp_runtime::BuildModuleGenesisStorage::

substrate/frame/support/test/tests/instance.rs

@@ -291,26 +291,26 @@ pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<u32, Call, Signature,
 
 fn new_test_ext() -> sp_io::TestExternalities {
 	GenesisConfig{
-		module1_Instance1: Some(module1::GenesisConfig {
+		module1_Instance1: module1::GenesisConfig {
 			value: 3,
 			test: 2,
-		}),
-		module1_Instance2: Some(module1::GenesisConfig {
+		},
+		module1_Instance2: module1::GenesisConfig {
 			value: 4,
 			test: 5,
-		}),
-		module2: Some(module2::GenesisConfig {
+		},
+		module2: module2::GenesisConfig {
 			value: 4,
 			map: vec![(0, 0)],
 			double_map: vec![(0, 0, 0)],
-		}),
-		module2_Instance1: Some(module2::GenesisConfig {
+		},
+		module2_Instance1: module2::GenesisConfig {
 			value: 4,
 			map: vec![(0, 0)],
 			double_map: vec![(0, 0, 0)],
-		}),
-		module2_Instance2: None,
-		module2_Instance3: None,
+		},
+		module2_Instance2: Default::default(),
+		module2_Instance3: Default::default(),
 	}.build_storage().unwrap().into()
 }
 

substrate/frame/support/test/tests/issue2219.rs

@@ -185,9 +185,9 @@ frame_support::construct_runtime!(
 #[test]
 fn create_genesis_config() {
 	GenesisConfig {
-		module: Some(module::GenesisConfig {
+		module: module::GenesisConfig {
 			request_life_time: 0,
 			enable_storage_role: true,
-		})
+		}
 	};
 }