js-data + Angular + Firebase + belongsTo/hasMany relations

<!DOCTYPE html>
<html ng-app="app">

  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.3.15/angular.min.js"></script>
    <script src="https://cdn.firebase.com/js/client/2.2.4/firebase.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/js-data/2.8.2/js-data.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/js-data-firebase/2.1.1/js-data-firebase.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/js-data-angular/3.1.0/js-data-angular.js"></script>
    
    <script src="script.js"></script>
  </head>

  <body>
    <h1>Open up your console to see the output</h1>
  </body>

</html>

angular.module('app', ['js-data'])
  .config(function(DSFirebaseAdapterProvider) {
    // This is so I can load the fake data from plunker
    DSFirebaseAdapterProvider.defaults.basePath = 'https://js-data-firebase.firebaseio.com';
  })
  .service('User', function(DS) {
    return DS.defineResource({
      name: 'user',
      relations: {
        hasMany: {
          post: {
            // localField is for linking relations
            localField: 'posts', // user.posts -> array of posts of this user
            // foreignKey is the "join" field
            foreignKey: 'userId' // the name of the field on a post that points to its parent user
          },
          comment: {
            // localField is for linking relations
            localField: 'comments', // user.comments -> array of comments of this user
            // foreignKey is the "join" field
            foreignKey: 'userId' // the name of the field on a comment that points to its parent user
          }
        }
      }
    });
  })
  .service('Post', function(DS) {
    return DS.defineResource({
      name: 'post',
      relations: {
        hasMany: {
          comment: {
            // localField is for linking relations
            localField: 'comments', // concept.comments -> array of comments of this post
            // foreignKey is the "join" field
            foreignKey: 'postId' // the name of the field on a comment that points to its parent post
          }
        },
        belongsTo: {
          user: {
            // localField is for linking relations
            localField: 'user', // post.user -> reference to this post's user
            // localKey is the "join" field
            localKey: 'userId' // the name of the field on an post that points to its parent user
          }
        }
      }
    });
  })
  .service('Comment', function(DS) {
    return DS.defineResource({
      name: 'comment',
      relations: {
        belongsTo: {
          post: {
            // localField is for linking relations
            localField: 'post', // comment.post -> reference to this comment's post
            // localKey is the "join" field
            localKey: 'postId' // the name of the field on a comment that points to its parent post
          },
          user: {
            // localField is for linking relations
            localField: 'user', // comment.user -> reference to this comment's user
            // localKey is the "join" field
            localKey: 'userId' // the name of the field on a comment that points to its parent user
          }
        }
      }
    });
  })
  .run(function(DS, DSFirebaseAdapter, User, Post, Comment) {
    DS.registerAdapter('fb', DSFirebaseAdapter, { default: true });
    
    return User.create({
      name: 'John'
    }).then(function (user) {
      return Post.create({
        title: 'foo',
        userId: user.id
      }).then(function (post) {
        return Comment.create({
          content: 'bar',
          postId: post.id,
          userId: user.id
        });
      });
    }).then(function (comment) {
      console.log(comment);
      console.log(comment.user);
      console.log(comment.post);
      console.log(User.get(comment.userId));
      
      // keep my firebase clean
      return User.destroyAll();
    }).then(function () {
      return Post.destroyAll();
    }).then(function () {
      return Comment.destroyAll();
    });
  });