Improve EnterpriseFee loading

Request is only send if there isn't another currently running, and also
ensure that filtered enterprise fees are loaded only when not other
request is running.

app/assets/javascripts/admin/order_cycles/controllers/incoming_controller.js.coffee

@@ -3,7 +3,18 @@ angular.module('admin.orderCycles').controller 'AdminOrderCycleIncomingCtrl', ($
 
   $scope.view = 'incoming'
   # NB: weirdly at this next line $scope.order_cycle.id comes out undefined so we use $scope.order_cycle_id instead
-  $scope.enterprise_fees = EnterpriseFee.index(order_cycle_id: $scope.order_cycle_id, per_item: true)
+  $scope.enterprise_fees = null
+  $scope.enterprise_fees = EnterpriseFee.index(order_cycle_id: $scope.order_cycle_id, per_item: true) unless EnterpriseFee.loading
+
+  # We want to make sure to load the filtered EnterpriseFee when any previous request is finished
+  # otherwise the enterprise_fees migh get overriden by non filtered ones.
+  $scope.$watch () ->
+    EnterpriseFee.loading
+  , (isLoading) =>
+    return if $scope.enterprise_fees
+
+    $scope.enterprise_fees = EnterpriseFee.index(order_cycle_id: $scope.order_cycle_id, per_item: true) isLoading == false
+
   $scope.exchangeTotalVariants = (exchange) ->
     return unless $scope.enterprises? && $scope.enterprises[exchange.enterprise_id]?
 

app/assets/javascripts/admin/order_cycles/services/enterprise_fee.js.coffee

@@ -14,10 +14,14 @@ angular.module('admin.orderCycles').factory('EnterpriseFee', ($resource) ->
     EnterpriseFee: EnterpriseFee
     enterprise_fees: {}
     loaded: false
+    loading: false
 
     index: (params={}) ->
+      return if @loading == true
+      @loading = true
       EnterpriseFee.index params, (data) =>
         @enterprise_fees = data
+        @loading = false
         @loaded = true
 
     forEnterprise: (enterprise_id) ->