Handle Zero CollateralPerOrder (#176)

modules/fee-market/src/lib.rs

@@ -69,6 +69,9 @@ pub mod pallet {
 		#[pallet::constant]
 		type MinimumRelayFee: Get<BalanceOf<Self, I>>;
 		/// The collateral relayer need to lock for each order.
+		///
+		/// This also represents the maximum slash value for a single delayed order.
+		/// Please note that if this value is set to zero the fee market will be suspended.
 		#[pallet::constant]
 		type CollateralPerOrder: Get<BalanceOf<Self, I>>;
 		/// The slot times set
@@ -503,7 +506,13 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	}
 
 	fn collateral_to_order_capacity(collateral: BalanceOf<T, I>) -> u32 {
-		(collateral / T::CollateralPerOrder::get()).saturated_into::<u32>()
+		let collateral_per_order = T::CollateralPerOrder::get();
+
+		if collateral_per_order.is_zero() {
+			0
+		} else {
+			(collateral / collateral_per_order).saturated_into::<u32>()
+		}
 	}
 }