Merge pull request #5487 from substantial/use-each-rather-than-map-when-truncating

Execute promises sequentially rather than parallel

lib/sequelize.js

@@ -1009,9 +1009,15 @@ Sequelize.prototype.truncate = function(options) {
     }
     }
   }, { reverse: false });
   }, { reverse: false });
 
 
-  return Promise.map(models, function(model) {
+  var truncateModel = function(model) {
     return model.truncate(options);
     return model.truncate(options);
-  });
+  };
+
+  if (options && options.cascade) {
+    return Promise.each(models, truncateModel);
+  } else {
+    return Promise.map(models, truncateModel);
+  }
 };
 };
 
 
 /**
 /**