fix(model): provide .field support for .update

lib/model.js

@@ -1640,6 +1640,15 @@ module.exports = (function() {
         return [results.length, results];
       }
 
+      Object.keys(valuesUse).forEach(function (attr) {
+        if (self.rawAttributes[attr].field && self.rawAttributes[attr].field !== attr) {
+          valuesUse[self.rawAttributes[attr].field] = valuesUse[attr];
+          delete valuesUse[attr];
+        }
+      });
+
+      mapFieldNames.call(self, options, self);
+
       // Run query to update all rows
       return self.QueryInterface.bulkUpdate(self.getTableName(), valuesUse, options.where, options, self.tableAttributes).then(function(affectedRows) {
         if (options.returning) {

test/model/attributes.test.js

@@ -222,6 +222,30 @@ describe(Support.getTestDialectTeaser("Model"), function () {
         });
       });
 
+      it('should bulk update', function () {
+        var Entity = this.sequelize.define('Entity', {
+            strField: {type: Sequelize.STRING, field: 'str_field'},
+        });
+
+        return this.sequelize.sync({force: true}).then(function() {
+          return Entity.create({strField: 'foo'});
+        }).then(function() {
+          return Entity.update(
+            {strField: 'bar'},
+            {where: {strField: 'foo'}}
+          );
+        }).then(function () {
+          return Entity.findOne({
+            where: {
+              strField: 'bar'
+            }
+          }).then(function (entity) {
+            expect(entity).to.be.ok;
+            expect(entity.get('strField')).to.equal('bar');
+          });
+        });
+      });
+
       it('should not contain the field properties after create', function () {
         var Model = this.sequelize.define('test', {
           id: {