fix bug with config.consumer_groups field

file/builder.go

@@ -933,11 +933,17 @@ func (b *stateBuilder) plugins() {
 
 		if b.isConsumerGroupScopedPluginSupported && *p.Name == ratelimitingAdvancedPluginName {
 			// check if deprecated consumer-groups configuration is present in the config
-			_, consumerGroupsFound := p.Config["consumer_groups"]
+			var consumerGroupsFound bool
+			if groups, ok := p.Config["consumer_groups"]; ok {
+				// if groups is an array of length > 0, then consumer_groups is set
+				if groupsArray, ok := groups.([]interface{}); ok && len(groupsArray) > 0 {
+					consumerGroupsFound = true
+				}
+			}
 			_, enforcedConsumerGroupFound := p.Config["enforced_consumer_group"]
 			if consumerGroupsFound || enforcedConsumerGroupFound {
 				b.err = errors.New("a rate-limiting-advanced plugin with config.consumer_groups\n" +
-					"and/or config.enforced_consumer_group was found. Please use Consumer Groups scoped\n" +
+					"and/or config.enforce_consumer_group was found. Please use Consumer Groups scoped\n" +
 					"Plugins when running against Kong Enterprise 3.4.0 and above.\n\n" +
 					"Check DOC_LINK for more information")
 				return