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Relational Query Builder giving error when adding to many-to-many relationship

See original GitHub issue

Issue type:

[ ] question [x] bug report [ ] feature request [ ] documentation issue

Database system/driver:

[ ] cordova [ ] mongodb [ ] mssql [ ] mysql / mariadb [ ] oracle [x] postgres [ ] cockroachdb [ ] sqlite [ ] sqljs [ ] react-native [ ] expo

TypeORM version:

[x] latest [ ] @next [] 0.x.x (or put your version here)

Steps to reproduce or a small repository showing the problem:

So I’ve been following the repository relations FAQ and other examples here, but it doesn’t seem to be working properly when trying to add an item to a many-to-many relationship

@Entity
class ContentItem
  @PrimaryGeneratedColumn('uuid')
  id: string;

 @ManyToMany(type => Image, image => image.contentItems)
  images: Image[]

 ...

@Entity()
export class Image {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @ManyToMany(type => ContentItem, contentItem => contentItem.images)
  @JoinTable()
  contentItems: ContentItem[]

...

await getConnection()
        .createQueryBuilder()
        .relation(Image, "contentItems")
        .of(imageId)
        .add(contentItemId)

And the error response

code: "23502"
column: "image_id"
detail: "Failing row contains (null, null)."
file: "execMain.c"
length: 197
line: "2042"
message: "null value in column "image_id" violates not-null constraint"
name: "QueryFailedError"
parameters: []
query: "INSERT INTO "image_content_item"("image_id", "content_item_id") VALUES (DEFAULT, DEFAULT)"
routine: "ExecConstraints"
schema: "public"
severity: "ERROR"
stacktrace: ["QueryFailedError: null value in column "image_id" violates not-null constraint",…]
table: "image_content_item"

For some reason it’s not binding the parameters so the insert fails