Does anyone know how to build automatic tagging (blog post/document) algorithm? Any example will be appreciated.
['https://Stackoverflow.com/questions/4490227', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/548690/']
It's not telling you that you have no Database.

It's telling you that it can't find a specific record

```
(Couldn't find Drummer with ID=1): 

```

It's likely that you have code that's doing `Drummer.find(1)` and that doesn't exist on your production environment.

Recommend you either:

* create a seeds file (heroku rake db:seed) [rails cast](http://railscasts.com/episodes/179-seed-data)
* push your entire database to heroku (heroku db:push) [make sure you understand this will wipe out your production database]
Heroku creates a database for each application deployed to it (no need to run `heroku rake db:create`. Here are the commands you should be using to deploy a Rails application to Heroku:

```
git init
git add .
git commit -m "initial import"
heroku create
git push heroku master
heroku rake db:migrate
heroku open

```