fixes queryInterface.addIndex for reserved keywords

lib/dialects/mysql/query-generator.js

@@ -243,7 +243,7 @@ module.exports = (function() {
     addIndexQuery: function(tableName, attributes, options) {
       var transformedAttributes = attributes.map(function(attribute) {
         if(typeof attribute === 'string') {
-          return attribute
+          return this.quoteIdentifier(attribute)
         } else {
           var result = ""
 
@@ -251,7 +251,7 @@ module.exports = (function() {
             throw new Error('The following index attribute has no attribute: ' + util.inspect(attribute))
           }
 
-          result += attribute.attribute
+          result += this.quoteIdentifier(attribute.attribute)
 
           if (attribute.length) {
             result += '(' + attribute.length + ')'

test/query-interface.test.js

@@ -71,7 +71,8 @@ describe(Support.getTestDialectTeaser("QueryInterface"), function () {
       this.queryInterface.dropTable('Users').success(function() {
         self.queryInterface.createTable('Users', {
           username: DataTypes.STRING,
-          isAdmin: DataTypes.BOOLEAN
+          isAdmin: DataTypes.BOOLEAN,
+          from: DataTypes.STRING
         }).success(function() {
           done()
         })
@@ -105,6 +106,14 @@ describe(Support.getTestDialectTeaser("QueryInterface"), function () {
         })
       })
     })
+
+    it('does not fail on reserved keywords', function (done) {
+      this.queryInterface.addIndex('Users', ['from']).done(function(err) {
+        expect(err).to.be.null
+
+        done()
+      })
+    })
   })
 
   describe('describeTable', function() {