Ruby on rails 赫罗库说：“我的朋友，我的朋友。”；指定的'；sqlite3'；对于数据库适配器“；

Heroku在初始提交时声明“为数据库适配器指定了'sqlite3'，但未加载gem。将

gem'sqlite3'

添加到您的Gemfile”

我已经更改了我的Gemfile，以便在开发中使用sqlite，在生产模式中使用pg。My database.yml被添加到.gitignore文件中。是否有任何地方我必须将sqlite更改为pg

提前谢谢

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.1'
gem 'activeadmin', github: 'gregbell/active_admin'
gem 'anjlab-bootstrap-rails', :require => 'bootstrap-rails',
                          :github => 'anjlab/bootstrap-rails',
                          :branch => '3.0.0'
gem "font-awesome-rails"
gem "json"
gem "nokogiri"
gem "leaflet-rails"
gem "mapbox-rails"

# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.0'

# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'

# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'

# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'

# Turbolinks makes following links in your web application faster. Read more:   https://github.com/rails/turbolinks
gem 'turbolinks'

# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 1.2'

group :doc do
  # bundle exec rake doc:rails generates the API under doc/api.
  gem 'sdoc', require: false
end

group :production, :staging do 
  gem 'pg'
  gem 'rails_12factor'    
end

group :development do 
  gem 'sqlite3'
  gem 'better_errors'
  gem "binding_of_caller"
end


# Use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.1.2'

# Use unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano', group: :development

# Use debugger
# gem 'debugger', group: [:development, :test]

我以前跑过

bundle install --without production

我的问题的解决方案是安装生产gems。我的生产gems与“指定的sqlite3适配器”有什么关系，我一点也不明白