Merge pull request #3873 from overlookmotel/tidy-addIndex

Tidy code for QueryInterface#addIndex

lib/query-interface.js

@@ -422,20 +422,12 @@ QueryInterface.prototype.renameColumn = function(tableName, attrNameBefore, attr
   }.bind(this));
 };
 
-QueryInterface.prototype.addIndex = function(tableName, _attributes, options, _rawTablename) {
-  var attributes, rawTablename;
-
+QueryInterface.prototype.addIndex = function(tableName, attributes, options, rawTablename) {
   // Support for passing tableName, attributes, options or tableName, options (with a fields param which is the attributes)
-  if (Array.isArray(_attributes)) {
-    attributes = _attributes;
-
-    rawTablename = _rawTablename;
-  } else {
-    // Support for passing an options object with a fields attribute instead of attributes, options
-    options = _attributes;
-    attributes = options.fields;
-
+  if (!Array.isArray(attributes)) {
     rawTablename = options;
+    options = attributes;
+    attributes = options.fields;
   }
 
   if (!rawTablename) {