Example of Realm association

realmExample.js

const Realm = require("realm");
const Post = {
  name: "Post",
  properties: {
    timestamp: 'date',
    content: 'string',
    title: "string",
    comments: 'Comment[]'
  },
};

const Comment = {
  name: 'Comment',
  properties: {
    username: 'string',
    comment: 'string',
    post: {
      type: 'linkingObjects',
      objectType: 'Post',
      property: 'comments'
    }
  }
}

// open a local realm with the 'Cat' schema
Realm.open({
  schemaVersion: 2,
  path: 'blog.realm',
  schema: [Post, Comment],
}).then(realm => {
  // create
  realm.write(() => {
    realm.create('Post', {
      title: 'firstPost',
      content: "my first post",
      timestamp: new Date(),
      comments: [
        {username: 'john', comment: 'This is my first comment'}
      ]
    })
  })

  // read
  const posts = realm.objects('Post');
  console.log('List of posts', posts.length)
})
.catch(error => console.error('Error opening realm db', error))