Heroku deployment - dead pages "We're sorry, but something went wrong."

Pretty new to rails/heroku. I created a clean project to help figure out what in the world is happening with heroku. Then I add to it with a:

rails generate controller Pages home contact

http://localhost:3000/pages/home shows exactly what we expect. Commit, push to git, push to heroku. Open the page on heroku and it returns the error page: "We're sorry, but something went wrong."

heroku logs don't开发者_运维知识库 seem to have anything interesting, and exceptional isn't registering that anything bad is happenin at all.

UPDATE: I've reduced the logs to an example of the offending bits.

2011-10-06T01:06:05+00:00 app[web.1]: Started GET "/pages/home" for 97.87.14.192 at 2011-10-05 18:06
:05 -0700
2011-10-06T01:06:05+00:00 app[web.1]:
2011-10-06T01:06:05+00:00 app[web.1]: ActiveRecord::ConnectionNotEstablished (ActiveRecord::Connecti
onNotEstablished):
2011-10-06T01:06:05+00:00 app[web.1]:
2011-10-06T01:06:05+00:00 app[web.1]:
2011-10-06T01:06:05+00:00 app[web.1]:
2011-10-06T01:06:05+00:00 app[web.1]: cache: [GET /pages/home] miss

Here's the gemfile I'm running

# gemfile
source 'http://rubygems.org'

gem 'rails', '3.1.0'

group :test do
  gem 'sqlite3-ruby', :require => 'sqlite3'
  gem 'rspec-rails', '2.6.1'
  gem 'webrat', '0.7.1'
end

group :development, do
  gem 'sqlite3-ruby', :require => 'sqlite3'
  gem 'rspec-rails', '2.6.1'
end

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This is just a generic heroku error so you don't display sensitive info to end users. Just type heroku logs in rails root and you should see the latest server details including your error.

If you have to run migrations the command is:

heroku run rake db:migrate

(Thanks to lampshady)

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Migrate your database on heroku then redeploy the app and restart the heroku server. Thats all you need to do.

  heroku rake db:migrate

  git push heroku master

  heroku restart

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Running the logs 'heroku logs', has a key giveaway: PG::Error: ERROR: relation "<Rails Model>" does not exist. This entry states your model could not be loaded.

To provide an update to previous answers, heroku rake has been deprecated. Heroku requires:

heroku run rake db:migrate

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From your heroku log ActiveRecord::ConnectionNotEstablished (ActiveRecord::Connecti onNotEstablished):. From the Rails API Doc, this error is raised when a connection to the database could not be established. I am guessing that your error may be in your database.yml file, most likely parameters not set for your production database.