“无法读取未定义的属性‘tablePath’”（TYPE ORM）

Question

    {
        "name": "TypeError"
"message": "Cannot read property 'tablePath' of undefined",
        "stack": "TypeError: Cannot read property 'tablePath' of undefined\n    at C:\\working\\Hianfa\\Hianfa\\api\\src\\query-builder\\SelectQueryBuilder.ts:1500:76\n    at Array.map (<anonymous>)\n    at SelectQueryBuilder.createJoinExpression (C:\\working\\Hianfa\\Hianfa\\api\\src\\query-builder\\SelectQueryBuilder.ts:1462:57)\n    at SelectQueryBuilder.getQuery (C:\\working\\Hianfa\\Hianfa\\api\\src\\query-builder\\SelectQueryBuilder.ts:54:21)\n    at SelectQueryBuilder.QueryBuilder.getQueryAndParameters (C:\\working\\Hianfa\\Hianfa\\api\\src\\query-builder\\QueryBuilder.ts:392:28)\n    at SelectQueryBuilder.<anonymous> (C:\\working\\Hianfa\\Hianfa\\api\\src\\query-builder\\SelectQueryBuilder.ts:1948:40)\n    at step (C:\\working\\Hianfa\\Hianfa\\api\\node_modules\\tslib\\tslib.js:136:27)\n    at Object.next (C:\\working\\Hianfa\\Hianfa\\api\\node_modules\\tslib\\tslib.js:117:57)\n    at C:\\working\\Hianfa\\Hianfa\\api\\node_modules\\tslib\\tslib.js:110:75\n    at new Promise (<anonymous>)"
    }

我在尝试使用映射表映射两个表时收到此错误。

供应商模型（表 1）

@ManyToMany(type => VendorToCategory, vendorToCategory => vendorToCategory.vendor)
// @JoinColumn({name: 'vendor_vendor_category_id'})
public vendorToCategory: VendorToCategory[];

供应商类别模型（表 2）

 @ManyToMany(type => VendorToCategory, vendorToCategory => vendorToCategory.vendorCategory)
    @JoinColumn({name: 'vendor_vendor_category_id'})
    public vendorToCategory: VendorToCategory[];

映射表（供应商到类别）

   @ManyToMany(type => Vendor, vendor => vendor.vendorToCategory)
    @JoinColumn({ name: 'vendor_id' })
    public vendor: Vendor[];

@ManyToMany(type => VendorCategory, vendorCategory => vendorCategory.vendorToCategory)
@JoinColumn({ name: 'vendor_category_id' })
public vendorCategory: VendorCategory[];

请帮我解决这个错误！

Answer 1

您的问题与装饰器的错误使用有关@JoinColumn；@JoinTable你应该在处理人际关系时使用@ManyToMany。

所以，而不是这个：

@ManyToMany(type => VendorToCategory, vendorToCategory => 
vendorToCategory.vendorCategory)
@JoinColumn({name: 'vendor_vendor_category_id'})
public vendorToCategory: VendorToCategory[];`

你应该写：

@ManyToMany(type => VendorToCategory, vendorToCategory => vendorToCategory.vendorCategory)
@JoinTable({
   name: "vendor_vendor_category_id",
   joinColumn: {
    name: "vendorCategory",
    referencedColumnName: "id"
   },
   inverseJoinColumn: {
    name: "vendor",
    referencedColumnName: "id"
    }})
public vendor: Vendor[];`

TypeORM 文档在处理关系方面并不那么具体，但它们确实提供了一些有用的示例。因此，如果您想要详细的答案，请查看它们。