use transactions in update, related to feathersjs-ecosystem#188

Author: jiangts

lib/index.js

@@ -240,8 +240,9 @@ class Service {
 
     // Force the {raw: false} option as the instance is needed to properly
     // update
+    const updateOptions = Object.assign({ raw: false }, params.sequelize);
 
-    return this._get(id, { sequelize: { raw: false }, query: where }).then(instance => {
+    return this._get(id, { sequelize: updateOptions, query: where }).then(instance => {
       if (!instance) {
         throw new errors.NotFound(`No record found for id '${id}'`);
       }
@@ -255,7 +256,7 @@ class Service {
         }
       });
 
-      return instance.update(copy, {raw: false}).then(() => this._get(id, {sequelize: options}));
+      return instance.update(copy, updateOptions).then(() => this._get(id, {sequelize: options}));
     })
       .then(select(params, this.id))
       .catch(utils.errorHandler);