sequelize.js - Sequelize - Set Instance Method after BulkCreate -

i have many-to-many relationship between user , organization tables. in both schemas relationship exists .belongstomany({ through: 'org_member', foreignkey: 'id'{);. relationship have been using instance method of setorganizations, setusers add in id's org_member table relationship, however, when run bulkcreate , on ensuing in promise chain call setorganizations([*current users organizationid*]) receive error error during post: typeerror: user.setorganizations not function. find out reason issue. due user being array of objects rather 1 instance?

here promise structure:

1. form submitted multiple emails

-bulkcreate users email

2. take createdusers object of newly created users, parse , pass array query newly created users user_id's use in junction table setting

-emails newly created users passed useremails array used in user.finall query.

3. returned user object uses .setorganizations() method , passes organizationid of current user queried users in junction table

here promise chain:

var users = _.map(req.body.email, function(value) {             return {                  email: value             };         });          models.user.bulkcreate(users)         .then(function(createdusers){             var useremails = [];              for(var key in createdusers){                 useremails.push(createdusers[key].email);             }              return models.user.findall({                 where: {                     email: { $or: useremails}                 },                 attributes: ['userid']             }).then(function(user){                 console.log(user);                  return user.setorganizations([req.user.organizationid]);             }).then(function(member){                  res.redirect('/app/setup/teams'); });