typeorm 错误：列中的空值违反了非空：允许空值？在 fk 中

Question

您好，我有两个实体员工和部门，其中一个部门有 0 或 1 个经理\n我尝试添加一个没有经理的部门，但收到此错误：

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错误：错误：列“manager_id”中的空值违反了非空\n约束

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我尝试添加一个只有名称但没有经理的部门\n我如何允许空值 \xe2\x80\x8b\xe2\x80\x8bin a fk

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实体员工：

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@Entity({ name: 'employees' })\nexport class Employee extends SharedProp {\n  constructor(firstName: string, lastName: string) {\n    super();\n    this.firstName = firstName;\n    this.lastName = lastName;\n  }\n  @PrimaryGeneratedColumn('uuid')\n  id: string;\n\n  @Column({ name: 'matricula', nullable: false })\n  matricula: string;\n\n  @Column({ name: 'first_name', nullable: false })\n  firstName: string;\n\n  @Column({ name: 'last_name', nullable: false })\n  lastName: string;\n\n  @Column()\n  user_id: string;\n\n  @Column()\n  departament_id: string;\n\n  @OneToOne(() => Departament, departament => departament.manager)\n  @ManyToOne(\n    () => Departament,\n    (departament: Departament) => departament.employees,\n  )\n  @JoinColumn({ name: 'departament_id' })\n  departament: Departament;\n\n  @OneToOne(() => User)\n  @JoinColumn({ name: 'user_id' })\n  user: User;\n}\n

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实体部门：

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@Entity({ name: 'departaments' })\nexport class Departament {\n  @PrimaryGeneratedColumn('uuid')\n  id: string;\n\n  @Column()\n  departament_name: string;\n\n  @Column()\n  manager_id: string;\n\n  @OneToOne(() => Employee, employee => employee.departament)\n  @JoinColumn({ name: 'manager_id' })\n  manager: Employee;\n\n  @OneToMany(() => Employee, (employee: Employee) => employee.departament)\n  employees: Array<Employee>;\n\n  @CreateDateColumn({ name: 'created_at' })\n  createdAt: Date;\n\n  @UpdateDateColumn({ name: 'updated_at' })\n  UpdatedAt: Date;\n}\n

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Answer 1

添加nullable: true可能为 null 的列。例子：

@Column({nullable: true })
user_id: string;

此错误来自您的数据库。所以之后要更新迁移。还尝试将默认值设置为 null，如下所示：

@Column({nullable: true, default: null })
user_id: string;

最后使用迁移将数据库中的表字段修改为可为空