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我开始使用 typeorm。我创建了一些实体：

@Table()
export class User {
@PrimaryColumn()
name: string;
@Column()
passwordHash: string;
@OneToMany(type => Sprint, sprint => sprint.scrumMaster)
sprints: Sprint[];
@OneToMany(type => BacklogItem, item => item.assignedTo)
assignments: BacklogItem[];
@OneToMany(type => BacklogItem, item => item.createdBy)
createdItems: BacklogItem[];
}
@Table()
export class Sprint {
@PrimaryGeneratedColumn()
id: number;
@Column("date")
start: Date;
@Column("date")
end: Date;
@ManyToOne(type => User, user => user.sprints)
scrumMaster: User;
@OneToMany(type => BacklogItem, item => item.sprint)
items: BacklogItem[];
@Column()
isFinished: boolean;
}

Typeorm 创建数据库 (Sqlite) 就好了。但是，每当我创建一个实体的实例时，例如let = user = …