```ruby
json.array!(@crumbs) do |crumb|
  json.extract! crumb, :id, :latitude, :longitude, :user_id, :timestamp, :message
  json.url crumb_url(crumb, format: :json)
end
```

Include author in JSON crumb response
user
```ruby
json.array!(@crumbs) do |crumb|
  json.extract! crumb, :id, :latitude, :longitude, :user_id, :timestamp, :message

  json.author do
    json.name crumb.user.name
  end

  json.url crumb_url(crumb, format: :json)
end
```
assistant