Challenges in maintaining the continuity of an entity within a complex network of

Currently, I am utilizing nestjs, typeorm, and nestjsx/crud to build API endpoints.

The user entity is defined like so:

@Entity({
    name: 'users'
})

export class User extends CommonEntity {

    @Column({ length: 104, unique: true })
    email: string;
    .
    .
    .

    @OneToOne(type => Role, role => role.user, { cascade: true, lazy: true })
    @JoinColumn()
    role: Role; 
}

As for the role entity:

@Entity({
    name: 'roles'
})

export class Role extends CommonEntity {

    @OneToOne(type => User, user => user.role)
    user: User;

    @Column({ length: 52 })
    name: string;

    @Column({ type: 'text' })
    policy: string;

}

I am looking to create a new user (with an associated role) using a single RESTful API request. How can this be achieved?

My attempts at POSTing have been unsuccessful:

  1. The first attempt resulted in a duplicate record error as it tried to create a new role record.
{
  "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="aedddadcc7c0c99e9dd6d7d4eec9c3cfc7c280cdc1c3">[email protected]</a>",
  "role": {
    "id": "1f07f012-9391-4b5f-b6d3-574c58f4e046"
  }
}
  1. In the second attempt, the roleId was ignored, and no changes were made to the database.
{
  "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c0b3b4b2a9aea7f0f3b8b9ba80a7ada1a9aceea3afad">[email protected]</a>",
  "roleId": "1f07f012-9391-4b5f-b6d3-574c58f4e046"
}

Answer №1

Whenever there is a duplication issue, consider switching from a OneToOne Relation to a ManyToMany Relationship. The uniqueness of the ManyToMany relationship can be ensured by utilizing a compound Id that includes both the user Id and role Id.

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