title: Relationships GraphQL
body: <p>The second week I try to link two collections in the apollo-server-express / MongoDB / Mongoose / GraphQL stack, but I do not understand how. I found a similar lesson with the REST API, what I need is called Relationships. I need this, but in GraphQL</p>
  
  <p><a href="https://www.youtube.com/watch?v=FVn_wj1jLN0&amp;index=7&amp;list=PLSpJkDDmpFZ5rZ5-Aur9WRNsBDSUS-0B9" rel="nofollow noreferrer">watch video</a></p>
  
  <p>How to add cars to the User?
  I collected the test server, the code is here: <a href="https://github.com/gHashTag/test-graphql-server" rel="nofollow noreferrer">https://github.com/gHashTag/test-graphql-server</a>
  Help</p>