Use immutable functions

Author: Aleksander Dikanski

lib/stackInformation.js

@@ -171,12 +171,15 @@ module.exports = {
 			BbPromise.bind(this).then(this.aliasStackLoadAliasTemplates)
 		)
 		.spread((currentTemplate, aliasStackTemplates) => {
-			const currentAliasStackTemplate = _.get(_.first(aliasStackTemplates, 'template', {}));
-			const deployedAliasStackTemplates = _.map(aliasStackTemplates, template => template.template);
+			const removed = _.filter(aliasStackTemplates, ['stack', `${this._provider.naming.getStackName()}-${this._alias}`]);
+			const filteredAliasStackTemplates = _.without(aliasStackTemplates, ['stack', `${this._provider.naming.getStackName()}-${this._alias}`]);
 
+			const currentAliasStackTemplate = _.get(_.first(removed), 'template', {});
+			const deployedAliasStackTemplates = _.map(filteredAliasStackTemplates, template => template.template);
+		
 			this._serverless.service.provider.deployedCloudFormationTemplate = currentTemplate;
 			this._serverless.service.provider.deployedCloudFormationAliasTemplate = currentAliasStackTemplate;
-			this._serverless.service.provider.deployedAliasTemplates = aliasStackTemplates;
+			this._serverless.service.provider.deployedAliasTemplates = filteredAliasStackTemplates;
 			return BbPromise.resolve([ currentTemplate, deployedAliasStackTemplates, currentAliasStackTemplate ]);
 		});
 	},