mongo.rb

# Place in rails config/initializers/

db_config = YAML::load(File.read(RAILS_ROOT + "/config/database.yml"))

if db_config[Rails.env] && db_config[Rails.env]['adapter'] == 'mongodb'
  mongo = db_config[Rails.env]
  MongoMapper.connection = Mongo::Connection.new(mongo['hostname'])
  MongoMapper.database = mongo['database']
end

# Use for database.yml

development:
  adapter: mongodb
  host: localhost
  database: telegram_development

test:
  adapter: mongodb
  host: localhost
  database: telegram_test

production:
  adapter: mongodb
  host: localhost
  database: telegram_production