javascript - How to establish relationships using Sequelize -

i hoping me correctly setup relationships in sequelize. believe have models correctly setup, not sure have never used api before, , documentation confusing. have attached picture of think tables should like, , below code snippets of think should happen can't tell.

any pointers on if db design accurate or not, , whether or not sequelize associations (hasmany, belongsto, etc) correct super helpful!

users model

'use strict';  module.exports = function(sequelize, datatypes) {    //define user table, , columns, data types, attributes   var user = sequelize.define('user', {     user_id: {...},     user_name: {...}    },        {      //define constraints, such foreign key      classmethods:{         associate: function(models) {             user.belongstomany(models.group);             user.hasmany(models.old_password);         }      }    });     return user; }; 

roles model

'use strict';  module.exports = function(sequelize, datatypes){    var role = sequelize.define('role',{     role_id: {...},     role_name:{...}    },    {    //define constraints, such foreign key      classmethods:{         associate: function(models){             role.belongsto(models.user);         }      }   });     return role; }; 

groups model

'use strict';  module.exports = function(sequelize, datatypes){    var group = sequelize.define('group', {     group_id: {...},     group_name: {...},                    });    return group; }; 

password model

'use strict';  module.exports = function(sequelize, datatypes){    //define table, , columns, data types, attributes   var old_password = sequelize.define('old_password', {     old_password_id: {...},     old_password_value: {...}    },       {   //define constraints, such foreign key     classmethods:{         associate: function(models){             old_password.hasone(models.user);         }     }   });     return old_password; }; 

sample table setup

the database design accurate. however, need define relationship between user , group. it's many-to-many relationship you'll need add constraint user model:

classmethods:{   associate: function(models){     user.belongstomany(models.group, {       // define join table       through: 'user_group',       // define foreign key       foreignkey: 'group_id'     });     models.group.belongstomany(user, {       through: 'user_group',       foreignkey: 'user_id'     });     user.hasmany(models.old_password);   } }