How to properly create a select query when using a (custom) junction table

This is a question regarding the proper way to select a record based on properties from both models (who share the junction table).

For example, let’s say we have the following two models:

@Entity({ name: "users" })
class User extends BaseEntity {
	@PrimaryColumn()
	public id: string;
	
	@OneToMany(type => RecordContext, context => context.user)
	public contexts: RecordContext[];

	// more columns
}

@Entity({ name: "records" })
class Record extends BaseEntity {
	@PrimaryColumn()
	public id: string;
	
	@OneToMany(type => RecordContext, context => context.record)
	public contexts: RecordContext[];

	// more columns
}

And this junction table:

@Entity({ name: "record_contexts" })
class RecordContext extends BaseEntity {
	@ManyToOne(type => Record, record => record.contexts, { primary: true })
	public readonly order: Order;

	@ManyToOne(type => User, user => user.contexts, { primary: true })
	public readonly user: User;

	@Column()
	public readonly role: string;

	@Column("simple-json")
	public readonly meta: any;
}

I want to be able to get the joined records for a specific record_id and user_id, and I’m stuck here:

Record.createQueryBuilder("record")
	.innerJoinAndSelect("record.contexts", "context")
	.where("record.id = :recordId", { recordId })
	.andWhere("context.user_id = :userId", { userId })

My problem is how to reference the user part the in the last line, since context.user is User and I don’t have the user_id column.
I’m using TypeORM version 0.1.12.

Thanks.

[pleerock]

I put answers in PR

[emirom]

Is it possible to query on typeORM junction tables? want to do a low complexity query on a many to many relations (todos-tags) using this query on todo_tags_tag junction table of typeORM with tagId and todoId FKs:

@Resolver(Todo)
export class TodoTagResolver {
  @FieldResolver(() => [Tag], { nullable: true })
  async Tags(@Root() todo: Todo): Promise<Tag[] | undefined> {
    const result = await getRepository(Tag).query(
      `SELECT * FROM tag
     INNER JOIN  todo_tags_tag ON tag.id=todo_tags_tag.tagId
     WHERE todoId=$1`,
      [todo.id]
    );
    console.log(result);
    return result;
  }
}

the respond is : "column todo_tags_tag.tagid does not exist",