Add _count and _exists relation properties

[joelstein]

What do you think about a feature that includes relation properties for the withCount() and withExists() Laravel methods?

Such a feature would generate a Typescript definition like this:

export interface User {
  // columns
  id: number
  name: string
  // relations
  posts: Post[]
  posts_count: int
  posts_exists: bool
}

[tcampbPPU]

i think we had them in a earlier version, but i didn't find to much use for them myself, happy to accept a PR that adds this with a optional flag to set these values.

[tcampbPPU]

You might also be able to do this with some TS generics:

interface User {
  // columns
  id: number
  name: string
  // relations
  posts: WithRelationExtras<Post>
}

interface Post {
  id: number
  title: string
}


// Generic to generate counts and exists...
interface WithRelationExtras<T> extends Array<T> {
  get count(): number;
  get exists(): boolean;
}

Object.defineProperty(Array.prototype, 'count', {
  get: function() {
    return this.length;
  }
});

Object.defineProperty(Array.prototype, 'exists', {
  get: function() {
    return this.length > 0;
  }
});

// create user with posts
const user: User = {
  id: 1,
  name: 'John Doe',
  posts: [
    { id: 1, title: 'Foo' },
    { id: 2, title: 'Bar' },
  ] as WithRelationExtras<Post>,
}

console.log(user.posts)

[github-actions[bot]]

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[bishwajitcadhikary]

#96 I have submitted a pull request. Please take a look at it.

[joelstein]

Thanks @bishwajitcadhikary! It appears that this issue has been merged, so I believe we can close this ticket.