```ts
// YourPage.component.ts

import { Component, OnInit } from '@angular/core';
import { Apollo } from 'apollo-angular';
import gql from 'graphql-tag';

@Component({
  selector: 'document-screen',
  template: `
    <div *ngIf="loading">Loading...</div>
    <div *ngIf="error">There was an error fetching the data!</div>
    <div *ngIf="!loading && subdocuments.length > 0">
      <page-layout [user]="user">
        <document-header [document]="document"></document-header>
        <document-list [documents]="subdocuments"></document-list>
      </page-layout>
    </div>
  `,
})
export class SampleGraphqlComponent implements OnInit {
  user: any = { id: 0, name: 'Some User' };

  document: any = { id: 0, title: 'Some Title' };

  subdocuments: any = [];

  error = '';
  loading = true;

  constructor(private apollo: Apollo) {}
  ngOnInit() {
    this.apollo
      .watchQuery({
        query: gql`
          query AllInfoQuery {
            user {
              userID
              name
            }
            document {
              id
              userID
              title
              brief
              status
            }
            subdocuments {
              id
              userID
              title
              content
              status
            }
          }
        `,
      })
      .valueChanges.subscribe((result: any) => {
        this.user = result?.data?.user;
        this.document = result?.data?.document;
        this.subdocuments = result?.data?.subdocuments;
        this.loading = result.loading;

        // Errors is an array and we're getting the first item only
        this.error = result.errors[0].message;
      });
  }
}
```