Using Validation

To use validation use class-validator. Example how to use class-validator with TypeORM:

import {Entity, PrimaryGeneratedColumn, Column} from "typeorm";
import {Contains, IsInt, Length, IsEmail, IsFQDN, IsDate, Min, Max} from "class-validator";
@Entity()
export class Post {
@PrimaryGeneratedColumn()
id: number;
@Column()
@Length(10, 20)
title: string;
@Column()
@Contains("hello")
text: string;
@Column()
@IsInt()
@Min(0)
@Max(10)
rating: number;
@Column()
@IsEmail()
email: string;
@Column()
@IsFQDN()
site: string;
@Column()
@IsDate()
createDate: Date;
}

Validation:

import {getManager} from "typeorm";
import {validate} from "class-validator";
let post = new Post();
post.title = "Hello"; // should not pass
post.text = "this is a great post about hell world"; // should not pass
post.rating = 11; // should not pass
post.email = "google.com"; // should not pass
post.site = "googlecom"; // should not pass
const errors = await validate(post);
if (errors.length > 0) {
throw new Error(`Validation failed!`);
} else {
await getManager().save(post);
}