Node.JS sequelizejs many to many - database

Question

I'm working on a web site where users can have a project, and for each project they have, they are assigned a certain role. Here is the schema
How I can make it with the model of squelize (Or maybe it's better to don't use an ORM (it's what I'm thinking right now..))
Here you can see a part of my model :
//Users
module.exports = function(sequelize, DataTypes) {
return sequelize.define('User', {
id: {
type: DataTypes.INTEGER(11),
allowNull: false,
primaryKey: true,
autoIncrement: true
},
// ******** //
}, {
tableName: 'users',
freezeTableName: true
});
};
//Projects
module.exports = function(sequelize, DataTypes) {
return sequelize.define('Project', {
id: {
type: DataTypes.INTEGER(11),
allowNull: false,
primaryKey: true,
autoIncrement: true
},
name: {
type: DataTypes.STRING,
allowNull: true
}
}, {
tableName: 'projects',
freezeTableName: true
});
};
//ProjectRole :
module.exports = function(sequelize, DataTypes) {
return sequelize.define('ProjectRole', {
id: {
type: DataTypes.INTEGER(11),
allowNull: false,
primaryKey: true,
autoIncrement: true
},
name: {
type: DataTypes.STRING,
allowNull: true
}
}, {
tableName: 'projects_roles',
freezeTableName: true
});
};
//user has projects :
module.exports = function(sequelize, DataTypes) {
return sequelize.define('UserProject', {
id: {
type: DataTypes.INTEGER(11),
allowNull: false,
primaryKey: true,
autoIncrement: true
},
}, {
tableName: 'users_has_projects',
freezeTableName: true
});
};