Merge pull request #733 from opentensor/fix/childkey-rate-limits

Fix rate limit for setting children

Author: distributedstatemachine

pallets/subtensor/src/staking/set_children.rs

@@ -60,13 +60,23 @@ impl<T: Config> Pallet<T> {
 
         // Ensure the hotkey passes the rate limit.
         ensure!(
-            Self::passes_rate_limit_globally(
+            Self::passes_rate_limit_on_subnet(
                 &TransactionType::SetChildren, // Set children.
                 &hotkey,                       // Specific to a hotkey.
+                netuid,                        // Specific to a subnet.
             ),
             Error::<T>::TxRateLimitExceeded
         );
 
+        // Set last transaction block
+        let current_block = Self::get_current_block_as_u64();
+        Self::set_last_transaction_block(
+            &hotkey,
+            netuid,
+            &TransactionType::SetChildren,
+            current_block
+        );
+
         // --- 2. Check that this delegation is not on the root network. Child hotkeys are not valid on root.
         ensure!(
             netuid != Self::get_root_netuid(),