TypeORM Generate New Migration From Entity

Database migration is the process of migrating data from one or more source databases to one or more target databases by using a database migration service. When a migration is finished, the dataset in the source databases resides fully, though possibly restructured, in the target databases.

Create a new entity file, eg. ProductAttribute.ts

@ObjectType()
@Entity()
export class ProductAttribute extends BaseEntity {
  @Field()
  @PrimaryGeneratedColumn("uuid")
  id: string;

  @Field()
  @Column("varchar", { length: 75 })
  title: string;
  
  @Field()
  @Column({
    type: "enum",
    enum: product_attribute,
  })
  value: product_attribute;
}

Generate a new migration file by running the following command:

npx typeorm migration:generate -n CreateProductAttributeTable

A new {Timestamps}-CreateProductAttributeTable file was generated in current directory level or if you specify its location by setting cli.migrationsDir to whatever you want in ormconfig.json :

{
  "type": "postgres",
  "host": "localhost",
  "port": 5432,
  "username": "postgres",
  "password": "postgres",
  "database": "database",
  "entities": ["dist/entities/**/*{.ts,.js}"],
  "migrations": ["dist/migrations/**/*{.ts,.js}"],
  "seeds": ["dist/seeds/**/*{.ts,.js}"],
  "factories": ["dist/factories/**/*{.ts,.js}"],
  "cli": {
    "entitiesDir": "src/entities",
    "migrationsDir": "src/migrations"
  }
}

Then run yarn build to build new dist

And finally, run npx typeorm migration:run

Note: set synchronize to false in createConnection