TypeORM does not save relations - typeorm

Question

I have the following entity which I want to save:
#Entity('approvals')
export class Approval {
#PrimaryGeneratedColumn()
id: string;
#ManyToOne(type => Task, task => task.approvals, {nullable: false, onDelete: 'CASCADE', lazy: true})
task: Promise<Task> | Task;
#ManyToOne(type => User, user => user.approvals, {nullable: false, onDelete: 'CASCADE', lazy: true})
user: Promise<User> | User;
#Column({ type: 'enum', enum: ApprovalState, default: ApprovalState.None })
state: ApprovalState;
constructor(partialApproval: Partial<Approval>) {
Object.assign(this, partialApproval);
}
}
If I want to save an entity which looks like (copied while debugging):
[
{
"task": {
"id": "2",
"name": "task1",
"type": "type1",
"neededTimeSeconds": 0,
"factor": 1,
"userId": "1",
"periodStart": "2019-01-01",
"periodEnd": "2019-01-31",
"done": true,
"__user__": {
"id": "1",
"username": "user1",
"password": "$2b$10$SBPIVm9p8L4YkpiUVJ.mpedIgWi5Je6MuWTM7IvgMdyhr27JYM0OG",
"credits": 0,
"gravatarHash": null
},
"__has_user__": true
},
"user": {
"id": "2",
"username": "shouldHaveApprovalUser1",
"password": "password1",
"credits": 0,
"gravatarHash": null
}
},
{
"task": {
"id": "2",
"name": "task1",
"type": "type1",
"neededTimeSeconds": 0,
"factor": 1,
"userId": "1",
"periodStart": "2019-01-01",
"periodEnd": "2019-01-31",
"done": true,
"__user__": {
"id": "1",
"username": "user1",
"password": "$2b$10$SBPIVm9p8L4YkpiUVJ.mpedIgWi5Je6MuWTM7IvgMdyhr27JYM0OG",
"credits": 0,
"gravatarHash": null
},
"__has_user__": true
},
"user": {
"id": "3",
"username": "shouldHaveApprovalUser2",
"password": "password1",
"credits": 0,
"gravatarHash": null
}
}
]
Then calling repository.save() with the above array, I get:
null value in column "taskId" violates not-null constraint
Although there is clearly the id defined in each task.
This is the Task entity class:
#Entity('tasks')
export class Task {
#PrimaryGeneratedColumn({ type: 'bigint' })
id: string;
#Column({ length: 30 })
name: string;
#Column({ default: 'help' })
type: string;
#Column({ name: 'needed_time', type: 'int', nullable: true })
neededTimeSeconds: number;
#Column({ type: 'int', default: 1 })
factor: number;
#ManyToOne(type => User, { nullable: true, lazy: true })
#JoinColumn({ name: 'user_id' })
user: Promise<User>;
#Column({ name: 'user_id' })
#RelationId((task: Task) => task.user)
userId: string;
#Column({ name: 'period_start', type: 'date', default: new Date() })
periodStart: string;
#Column({ name: 'period_end', type: 'date', default: new Date() })
periodEnd: string;
#Column({ type: 'boolean', default: false })
done: boolean;
#OneToMany(type => Approval, approval => approval.task, { nullable: true, lazy: true })
approvals: Promise<Approval[]>;
#OneToMany(type => TaskMessage, taskMessage => taskMessage.task, { cascade: ['remove'], lazy: true })
messages: Promise<TaskMessage[]>;
constructor(partialTask: Partial<Task>) {
Object.assign(this, partialTask);
}
}
Can anyone tell me why the relation task is not going to be assigned/saved?

Answer 1

I think you are missing cascade: true for the options of the relations, this should be set on the loose side of the relation (OneToMany) - check the example

Answer 2

You can use Typeorm's cascades for this: https://orkhan.gitbook.io/typeorm/docs/relations#cascades
Setting the cascade property in your relationship decorator changes the behavior of typeorm's .save() method.
#OneToMany(type => Approval, approval => approval.task, {
nullable: true,
lazy: true,
cascade: ["insert", "update", "remove"]
})
approvals: Approval[];
With cascades enabled, you can insert, update or remove related entities with a single call to .save().
To create a new approval and insert task:
await this.approvalsEntity.save({ ...approvalData, task: taskData })
To update a task on a pre-existing approval:
await this.approvalsEntity.save({
id: approvalId,
task: { id: taskId, ...approvalUpdate }
})