如何返回新创建的实体及其与 Nest.js/TypeORM 的关系？

Question

I am having trouble trying to figure out the best way to return a newly created entity along with its relationship(s).

Alone, each route that I have is working properly. Meaning, all CRUD operations work great. If I do a GET on the entity, I am also getting the relationship back as expected.

The issue I am stumbling with is, when a new entity is created--I am returning that entity. For example:

const foo = this.create();

foo.relationshipId = relationshipId;
foo.bar = bar;
foo.baz = baz;
foo.uuid = uuidv4();

try {
    await foo.save();
} catch (error) {
    // this.logger.error(`Failed to create the foo: ${error.stack}`);

    throw new InternalServerErrorException();
}

return foo;

If I log what foo is, I get back something that looks like this:

foo: {
    relationshipId: 1,
    bar: 'example',
    baz: 'example',
    uuid: '123-asdf-example'
}

What I need is to also include the actual related model/entitiy. Something like this:

foo: {
    relationshipId: 1,
    related: {
        some: 'property',
        another: 'example',
    },
    bar: 'example',
    baz: 'example',
    uuid: '123-asdf-example'
}

If I do a "regular" GET for that entity I do get the related entity back with it (exactly as the example above). It's only at the create method I am not returning the relationship.

How can I return the newly created entity along with the relationship? Do I need to do a GET on the new entity? Is there a better way to do this?

Thank you for any suggestions!

UPDATE/SOLUTION

Here is what ended up working for me (and also fits perfectly to what @Schutt suggested). This is my foo.repository.ts file:

...

const foo = this.create();

foo.bar = bar;
foo.uuid = uuidv4();

try {
    await foo.save();
} catch (error) {
    // this.logger.error(`Failed to create the foo: ${error.stack}`);

    throw new InternalServerErrorException();
}

return await this.findOne({
    where: { id: foo.id },
    relations: ['related'],
});

I am now getting the newly created entity as well as the related entitiy. In my frontend, I can display something like this now:

{{ foo.relation.name }}

Answer 1

I don't think that it is possible to load the relationship while you .save() your entity.

You have to re-fetch the entity. (ie with foo.findOne(..) there you can specify the relations property and this will then load your relation automatically)