sequelize.js TIMESTAMP not DATETIME - mysql

Question

In my node.js app I have several models in which I want to define TIMESTAMP type columns, including the default timestamps created_at and updated_at.
According to sequelize.js' documentation, there is only a DATE data type. It creates DATETIME columns in MySQL.
Example:
var User = sequelize.define('User', {
... // columns
last_login: {
type: DataTypes.DATE,
allowNull: false
},
...
}, { // options
timestamps: true
});
Is it possible to generate TIMESTAMP columns instead?

Answer 1

Just pass in 'TIMESTAMP' string to your type
module.exports = {
up: function (queryInterface, Sequelize) {
return queryInterface.createTable('users', {
id: {
type: Sequelize.INTEGER,
primaryKey: true,
autoIncrement: true
},
created_at: {
type: 'TIMESTAMP',
defaultValue: Sequelize.literal('CURRENT_TIMESTAMP'),
allowNull: false
},
updated_at: {
type: 'TIMESTAMP',
defaultValue: Sequelize.literal('CURRENT_TIMESTAMP'),
allowNull: false
}
});
}
};

Answer 2

According to the Sequelize Documentation, you can set a defaultValue of Sequelize.NOW to create a timestamp field. This has the effect but relies on Sequelize to actually populate the timestamp. It does not create a "CURRENT_TIMESTAMP' attribute on the table.
var Foo = sequelize.define('Foo', {
// default values for dates => current time
myDate: {
type: Sequelize.DATE,
defaultValue: Sequelize.NOW
}
});
So, this does accomplish the end goal of having a timestamp field, but it is controlled through Sequelize and not through the actual database engine.
It also appears to work on databases that do not have a timestamp functionality, so that may be a benefit.
Reference URL: http://sequelize.readthedocs.org/en/latest/docs/models-definition/#definition

Answer 3

In my case i create model like below
module.exports = (sequelize, type) => {
return sequelize.define('blog', {
blogId: {
type: type.INTEGER,
primaryKey: true,
autoIncrement: true
},
text: type.STRING,
createdAt:{
type: 'TIMESTAMP',
defaultValue: sequelize.literal('CURRENT_TIMESTAMP'),
allowNull: false
},
updatedAt:{
type: 'TIMESTAMP',
defaultValue: sequelize.literal('CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP'),
allowNull: false
}
})
}

Answer 4

You can also use the moment for creating a timestamp:
const moment = require('moment-timezone');
createdAt: {
type: DataTypes.NOW,
allowNull: false,
defaultValue: moment.utc().format('YYYY-MM-DD HH:mm:ss'),
field: 'createdAt'
},

Answer 5

instead of
type: DataTypes.DATE,
use below code
createdAt: {
allowNull: false,
type: Sequelize.DATE,
defaultValue: Sequelize.fn('NOW'),
},
updatedAt: {
allowNull: false,
type: Sequelize.DATE,
defaultValue: Sequelize.fn('NOW'),
},

Answer 6

What I did with sqLite is extended DataTypes with my custom sql logic for TIMESTAMP and it worked fine. I'm not 100% sure how the sql syntax should look for MySQL but my guess it's something similar to what I have. Look at example:
function (sequelize, DataTypes) {
var util = require('util');
var timestampSqlFunc = function () {
var defaultSql = 'DATETIME DEFAULT CURRENT_TIMESTAMP';
if (this._options && this._options.notNull) {
defaultSql += ' NOT NULL';
}
if (this._options && this._options.onUpdate) {
// onUpdate logic here:
}
return defaultSql;
};
DataTypes.TIMESTAMP = function (options) {
this._options = options;
var date = new DataTypes.DATE();
date.toSql = timestampSqlFunc.bind(this);
if (!(this instanceof DataTypes.DATE)) return date;
DataTypes.DATE.apply(this, arguments);
};
util.inherits(DataTypes.TIMESTAMP, DataTypes.DATE);
DataTypes.TIMESTAMP.prototype.toSql = timestampSqlFunc;
var table = sequelize.define("table", {
/* table fields */
createdAt: DataTypes.TIMESTAMP,
updatedAt: DataTypes.TIMESTAMP({ onUpdate: true, notNull: true })
}, {
timestamps: false
});
};
All you need to do for MySQL is to change SQL type generation in timestampSqlFunc function, so for example defaultSql variable would be 'TIMESTAMP DEFAULT CURRENT_TIMESTAMP'