typeOrm unique row - nestjs

Question

I'm trying to make a Entity using typeOrm on my NestJS, and it's not working as I expected.
I have the following entity
#Entity('TableOne')
export class TableOneModel {
#PrimaryGeneratedColumn()
id: number
#PrimaryColumn()
tableTwoID: number
#PrimaryColumn()
tableThreeID: number
#CreateDateColumn()
createdAt?: Date
}
This code generate a migration that generates a table like the example below
+--------------+-------------+------+-----+----------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------+-------------+------+-----+----------------------+-------+
| id | int(11) | NO | | NULL | |
| tableTwoID | int(11) | NO | | NULL | |
| tableThreeID | int(11) | NO | | NULL | |
| createdAt | datetime(6) | NO | | CURRENT_TIMESTAMP(6) | |
+--------------+-------------+------+-----+----------------------+-------+
That's ok, the problem is, that I want to the table only allow one row with tableTwoID and tableThreeID, what should I use in the Entity to generated the table as I expected it to be?
Expected to not allow rows like the example below
+----+------------+--------------+----------------------------+
| id | tableTwoID | tableThreeID | createdAt |
+----+------------+--------------+----------------------------+
| 1 | 1 | 1 | 2019-10-30 19:27:43.054844 |
| 2 | 1 | 1 | 2019-10-30 19:27:43.819174 | <- should not allow the insert of this row
+----+------------+--------------+----------------------------+

Answer 1

Try marking the column as Unique
#Unique()
ColumnName

Answer 2

This is currently expected behavior from TypeORM. According to the documentation if you have multiple #PrimaryColumn() decorators you create a composite key. The combination of the composite key columns must be unique (in your above '1' + '1' + '1' = '111' vs '2' + '1' + '1' = '211'). If you are looking to make each column unique along with being a composite primary key, you should be able to do something like #PrimaryColumn({ unique: true })