Question

import { Entity, Column, BaseEntity, ManyToMany, JoinColumn, PrimaryColumn } from 'typeorm';

@Entity()
export class Permission extends BaseEntity {
    @PrimaryColumn()
    code: string;
}

@Entity()
export class Role extends BaseEntity {
    @PrimaryColumn()
    code: string;

    @ManyToMany(() => Permission, { cascade: false })
    @JoinColumn()
    permission: Permission[];
}

@Entity('users')
export class User extends BaseEntity {
    @PrimaryGeneratedColumn('uuid')
    id: string;

    @Column({ unique: true })
    email: string;

    @ManyToMany(() => Role)
    @JoinColumn()
    roles: Role[];

    @ManyToMany(() => Permission)
    @JoinColumn()
    permissions: Permission[];
}

hasPermission(user: User, code: string): Boolean => {
    // ...
}

我想有效地检查用户是否具有权限。即John是具有角色['inventoryManager']和权限['listing:delete']的用户。角色inventoryManager具有权限['listing:read', 'listing:update']。因此，John.hasPermission('listing:update')和John.hasPermission('listing:delete')都将返回true，而John.hasPermission('listing:create')应该返回false。

虽然我可以全选，然后循环遍历是一个解决方案，但我认为效率低下并且选择过度。

Answer 1

您是否考虑过使用QueryBuilder？ https://github.com/typeorm/typeorm/blob/master/docs/select-query-builder.md#getting-the-generated-query

然后您可以查看查询输出，并尝试不同的联接和过滤策略，并比较其效率。

TypeORM ManyToMany关系高效查询

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