// 1: The model schema.
var modelDefinition = {
    username: {
        type: Sequelize.STRING,
        unique: true,
        allowNull: false
    },

    password: {
        type: Sequelize.STRING,
        allowNull: false
    }
};

// 2: The model options.
var modelOptions = {
    instanceMethods: {
        comparePasswords: comparePasswords
    },
    hooks: {
        beforeValidate: hashPassword
    }
};

// 3: Define the User model.
var UserModel = db.define('user', modelDefinition, modelOptions);

// Compares two passwords. Will be available on an instance when retrieved.
function comparePasswords(password, callback) {
    // TODO: Password comparison logic.
}

// Hashes the password for a user object. Handled before the INSERT
function hashPassword(user) {
    // TODO: Password hashing logic.
}