我有一个使用TypeORM和PostgreSQL数据库的Typescript Nestjs项目,并且我很难定义多对一关系,因为TypeORM尝试创建整数类型的ID字段,而我正在使用UUID字段。有没有办法告诉TypeORM使用不同于整数的数据类型?
这是一个无法正常工作的实体的示例:
export class AgentKitsEntity implements Model {
@PrimaryGeneratedColumn()
@Generated('uuid')
id: string;
}
@Entity({name: 'users'})
export class User extends AgentKitsEntity implements UserModel {
@Column()
username: string;
@ManyToOne(type => View)
@JoinColumn({name: 'view_id', referencedColumnName: 'id'})
view: View;
}
这会导致以下错误:
query failed: ALTER TABLE "users" ADD CONSTRAINT "FK_2ed8b186dce83a446f94ac9aae4" FOREIGN KEY ("view_id") REFERENCES "views"("id")
error: { error: foreign key constraint "FK_2ed8b186dce83a446f94ac9aae4" cannot be implemented
at Connection.parseE (/home/jonathan/projects/agent-kits/api-data/node_modules/pg/lib/connection.js:554:11)
at Connection.parseMessage (/home/jonathan/projects/agent-kits/api-data/node_modules/pg/lib/connection.js:379:19)
at Socket.<anonymous> (/home/jonathan/projects/agent-kits/api-data/node_modules/pg/lib/connection.js:119:22)
at emitOne (events.js:116:13)
at Socket.emit (events.js:211:7)
at addChunk (_stream_readable.js:263:12)
at readableAddChunk (_stream_readable.js:250:11)
at Socket.Readable.push (_stream_readable.js:208:10)
at TCP.onread (net.js:601:20)
name: 'error',
length: 228,
severity: 'ERROR',
code: '42804',
detail: 'Key columns "view_id" and "id" are of incompatible types: integer and uuid.',
hint: undefined,
position: undefined,
internalPosition: undefined,
internalQuery: undefined,
where: undefined,
schema: undefined,
table: undefined,
column: undefined,
dataType: undefined,
constraint: undefined,
file: 'tablecmds.c',
line: '6503',
routine: 'ATAddForeignKeyConstraint' }
编辑:只是要清楚,问题不是为主键创建UUID字段,这是可行的。问题是我要引用的表(在本示例中为“ views”)使用UUID主键,因此我也需要为引用该表的字段(在本示例中为“ views”)使用UUID。 TypeORM自动创建具有整数类型的“ view_id”字段,大概是因为它假定主键值将(应该?)始终为整数(这让我感到非常疯狂)。
它必须以某种方式可配置,不是吗?
答案 0 :(得分:1)
我最终找到了解决方案,并将其发布在这里供以后参考。
以下对我有用:
export class AgentKitsEntity implements Model {
@PrimaryGeneratedColumn('uuid')
@Generated('uuid')
id: string;
}
@Entity({name: 'users'})
export class User extends AgentKitsEntity implements UserModel {
@Column()
username: string;
@ManyToOne(type => View, { nullable: true })
@JoinColumn({name: 'view_id'})
view: View;
}
似乎解决的关键区别是我在@PrimaryGeneratedColumn()
装饰器中指定了'uuid'。这是令人惊讶的,因为实际上在数据库中已将字段正确地创建为UUID,但是除非您显式指定类型,否则TypeORM似乎将键字段假定为整数,即使该字段足够了解如何创建正确的数据也是如此。字段本身的类型。
编辑:仔细研究,结果发现@Generated('uuid')实体是多余的,因此上述基类的代码可以简化为:
export class AgentKitsEntity implements Model {
@PrimaryGeneratedColumn('uuid')
id: string;
}