Question

当我将 @ nest / swagger 库更新为版本4时，发生了此错误：

(node:16134) UnhandledPromiseRejectionWarning: Error: A circular dependency has been detected (property key: "customer"). Please, make sure that each side of a bidirectional relationships are using lazy resolvers ("type: () => ClassType").
    at SchemaObjectFactory.createNotBuiltInTypeReference (/opt/desenvolvimento/Haizen/projectx_back/node_modules/@nestjs/swagger/dist/services/schema-object-factory.js:182:19)
    at SchemaObjectFactory.mergePropertyWithMetadata (/opt/desenvolvimento/Haizen/projectx_back/node_modules/@nestjs/swagger/dist/services/schema-object-factory.js:117:25)
    at /opt/desenvolvimento/Haizen/projectx_back/node_modules/@nestjs/swagger/dist/services/schema-object-factory.js:66:35
    at Array.map (<anonymous>)
    at SchemaObjectFactory.exploreModelSchema (/opt/desenvolvimento/Haizen/projectx_back/node_modules/@nestjs/swagger/dist/services/schema-object-factory.js:65:52)
    at SchemaObjectFactory.createNotBuiltInTypeReference (/opt/desenvolvimento/Haizen/projectx_back/node_modules/@nestjs/swagger/dist/services/schema-object-factory.js:187:37)
    at SchemaObjectFactory.mergePropertyWithMetadata (/opt/desenvolvimento/Haizen/projectx_back/node_modules/@nestjs/swagger/dist/services/schema-object-factory.js:117:25)
    at /opt/desenvolvimento/Haizen/projectx_back/node_modules/@nestjs/swagger/dist/services/schema-object-factory.js:66:35
    at Array.map (<anonymous>)
    at SchemaObjectFactory.exploreModelSchema (/opt/desenvolvimento/Haizen/projectx_back/node_modules/@nestjs/swagger/dist/services/schema-object-factory.js:65:52)

我的模型课似乎是这样：

@Entity()
export class Job {
.
.
.
    @ManyToOne(type => Customer, customer => customer.jobs)
    @ApiProperty({ type: Customer })
    customer: Customer;
}

Answer 1

最适合我的解决方案是使用箭头功能在 @ApiProperty（）中声明类型，如下所示：

@Entity()
export class Job {
.
.
.
    @ManyToOne(type => Customer, customer => customer.jobs)
    @ApiProperty({ type: () => Customer })
    customer: Customer;
}

Answer 2

对于同样遇到此问题的任何人，您可以将 type 上的 enum 键更改为 @ApiProperty 键。这对我有用。

Answer 3

至少还有三种情况您会收到相同的错误消息，即使它们与双向关系无关：

枚举类型

错误：

print > "File" $1 ".csv"

正确：

匿名类型

错误：

@ApiProperty({
    type: Salutation
})
public salutation: Salutation;

正确：

@ApiProperty({
    enum: Salutation
})
public salutation: Salutation;

空

错误：

@ApiProperty({
})
public address: {
    street: string;
    houseNumber: string;
};

正确：

@ApiProperty({
    type: Address
})
public address: Address;

我为此在 Github 上创建了一个问题：https://github.com/nestjs/swagger/issues/1475

Nestjs Swagger 4的循环依赖

3 个答案:

枚举类型

匿名类型

空