allowNull:false and required:true did not validate null string input - node.js

Question

My app is running nodejs 10.16 and sequelizejs 5.7 with postgresql 11. The initial connection is setup as:
const Sql = require("sequelize");
const db = new Sql('mydb', 'postgres', `${process.env.DB_PASSWORD}`, {
host: 'localhost',
dialect: 'postgres',
port:5432,
} );
A Group model is defined as:
const Joi = require('#hapi/joi');
const Sql = require('sequelize');
const db = require("../startup/db");
const Group = db.define('group', {
name: {type: Sql.STRING,
allowNull: false,
min: 1,
max: 50,
required: true,
},
owner_id: {
type: Sql.INTEGER,
allowNull: false,
required: true,
},
status: {type: Sql.STRING,
allowNull: false,
isIn: ['active', 'inactive']
},
last_updated_by_id: {type: Sql.INTEGER},
createdAt: Sql.DATE,
updatedAt: Sql.DATE
}, {
indexes: [
{
fields: ['name', 'owner_id']
}
]
});
function validateGroup(group) {
const schema = Joi.object({
name: Joi.string()
.min(1)
.max(50)
.required()
.trim(),
status: Joi.string()
.required()
.trim(),
});
return schema.validate(group, {allowUnknown: true});
};
module.exports.Group = Group;
module.exports.validateGroup = validateGroup;
Here is the in router /group/new to save a new group:
router.post('/new', async (req, res) => {
const { err } = validateGroup(req.body);
if (err) return res.status(400).send(err.details[0].message);
let group = Group.build(_.pick(req.body, ['name', 'status']));
group.owner_id = req.user.id;
group.last_updated_by_id = req.user.id;
let grpmember = new Groupmember({owner_id: req.user.id});
try {
await db.transaction(async () => {
await group.save();
grpmember.group_id = group.id;
await grpmember.save();
return res.status(200).send(`${group.name}-已经保存！`);
});
} catch (err) {
console.log("error in saving new group ", err);
return res.status(400).send('保存错误，请再试一遍！');
};
});
Here is the Group table output which contains both empty and non-empty name:
Why the validation for name field, such as allowNull:false and required: true did not validate the input value?

Answer 1

The following is the code that works:
const Group = db.define('group', {
name: {type: Sql.STRING,
validate: {
len:{
args:[1,50],
msg:"Name between 1 to 50 chars"
} ,
}
},
owner_id: {
type: Sql.INTEGER,
validate: {
isInt: true,
},
},
status: {type: Sql.STRING,
validate: {
isIn: ['active', 'inactive'],
},
},
group_data: {
type: Sql.JSONB
},
last_updated_by_id: {type: Sql.INTEGER},
fort_token: {type: Sql.STRING,
validate: {
min:20, //64 for production
},
},
createdAt: Sql.DATE,
updatedAt: Sql.DATE
}