//How I'm defining a user model in my application
module.exports = mongoose.model( "User",
    {
        username : {
            type : String,
            default: "",
            unique: true
        },
        password : {
            type : String,
            default: ""
        },
        firstName: {
            type : String,
            default: ""
        },
        lastName : {
            type : String,
            default: ""
        },
        email    : {
            type : String,
            default: "",
            validate: isValidEmail,
            unique: true
        }
    }
);

//How Mongoose docs show defining a model:
var userSchema = new Schema( {
    username : {
        type : String,
        default: "",
        unique: true
    },
    password : {
        type : String,
        default: ""
    },
    firstName: {
        type : String,
        default: ""
    },
    lastName : {
        type : String,
        default: ""
    },
    email    : {
        type : String,
        default: "",
        validate: isValidEmail,
        unique: true
    }
} );
var userModel = mongoose.model( "User", useSchema );