web-dev-qa-db-ja.com

Gem :: LoadError：pg（〜> 0.18）をアクティブにできません。すでにpg-1.0.0をアクティブにしています

私はRailsチュートリアルを行ってきました ここ を使用して、$ _を使用してコメントの移行を移行する必要があるまで成功しましたRails db：migrate。この時点まで、記事モデルを生成し、記事を移行することで問題なく移行を作成できました。これらの2つの移行の間に、Gemfileで何も変更されていないため、Bundlerに問題があるのか​​どうかはわかりません。

エラーと、それに続く完全なコマンドライン出力、およびGemfileとschema.rbを示します。

Gem::LoadError: can't activate pg (~> 0.18), already activated pg-1.0.0.

Gem::LoadError: Specified 'postgresql' for database adapter, but the gem is not loaded. Add `gem 'pg'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).

完全なコマンドライン出力

xxx:gangelo: ~/dev/Rails/test/blog (master*) ☠  rbenv exec Rails db:migrate
Rails aborted!
Gem::LoadError: Specified 'postgresql' for database adapter, but the gem is not loaded. Add `gem 'pg'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/connection_adapters/connection_specification.rb:188:in `rescue in spec'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/connection_adapters/connection_specification.rb:185:in `spec'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:880:in `establish_connection'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/connection_handling.rb:58:in `establish_connection'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/railtie.rb:124:in `block (2 levels) in <class:Railtie>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:69:in `instance_eval'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:69:in `block in execute_hook'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:60:in `with_execution_control'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:65:in `execute_hook'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:50:in `block in run_load_hooks'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:49:in `each'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:49:in `run_load_hooks'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/base.rb:326:in `<module:ActiveRecord>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/base.rb:25:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/mysql_database_tasks.rb:6:in `<class:MySQLDatabaseTasks>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/mysql_database_tasks.rb:3:in `<module:Tasks>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/mysql_database_tasks.rb:2:in `<module:ActiveRecord>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/mysql_database_tasks.rb:1:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:74:in `<module:DatabaseTasks>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:35:in `<module:Tasks>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:2:in `<module:ActiveRecord>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:1:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/railtie.rb:34:in `block (3 levels) in <class:Railtie>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/railties-5.1.4/lib/Rails/commands/rake/rake_command.rb:21:in `block in perform'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/railties-5.1.4/lib/Rails/commands/rake/rake_command.rb:18:in `perform'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/railties-5.1.4/lib/Rails/command.rb:46:in `invoke'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/railties-5.1.4/lib/Rails/commands.rb:16:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/bin/Rails:9:in `require'
/Users/gangelo/dev/Rails/test/blog/bin/Rails:9:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/client/Rails.rb:28:in `load'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/client/Rails.rb:28:in `call'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/client.rb:30:in `run'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/bin/spring:49:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/bin/spring:15:in `<top (required)>'
bin/Rails:3:in `load'
bin/Rails:3:in `<main>'

Caused by:
Gem::LoadError: can't activate pg (~> 0.18), already activated pg-1.0.0. Make sure all dependencies are added to Gemfile.
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/connection_adapters/postgresql_adapter.rb:2:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/connection_adapters/connection_specification.rb:186:in `spec'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:880:in `establish_connection'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/connection_handling.rb:58:in `establish_connection'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/railtie.rb:124:in `block (2 levels) in <class:Railtie>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:69:in `instance_eval'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:69:in `block in execute_hook'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:60:in `with_execution_control'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:65:in `execute_hook'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:50:in `block in run_load_hooks'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:49:in `each'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/lazy_load_hooks.rb:49:in `run_load_hooks'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/base.rb:326:in `<module:ActiveRecord>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/base.rb:25:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/mysql_database_tasks.rb:6:in `<class:MySQLDatabaseTasks>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/mysql_database_tasks.rb:3:in `<module:Tasks>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/mysql_database_tasks.rb:2:in `<module:ActiveRecord>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/mysql_database_tasks.rb:1:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:74:in `<module:DatabaseTasks>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:35:in `<module:Tasks>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:2:in `<module:ActiveRecord>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:1:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/activerecord-5.1.4/lib/active_record/railtie.rb:34:in `block (3 levels) in <class:Railtie>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/railties-5.1.4/lib/Rails/commands/rake/rake_command.rb:21:in `block in perform'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/railties-5.1.4/lib/Rails/commands/rake/rake_command.rb:18:in `perform'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/railties-5.1.4/lib/Rails/command.rb:46:in `invoke'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/railties-5.1.4/lib/Rails/commands.rb:16:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/bin/Rails:9:in `require'
/Users/gangelo/dev/Rails/test/blog/bin/Rails:9:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/client/Rails.rb:28:in `load'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/client/Rails.rb:28:in `call'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/client.rb:30:in `run'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/bin/spring:49:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load'
/Users/gangelo/dev/Rails/test/blog/vendor/bundle/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `<top (required)>'
/Users/gangelo/dev/Rails/test/blog/bin/spring:15:in `<top (required)>'
bin/Rails:3:in `load'
bin/Rails:3:in `<main>'
Tasks: TOP => db:migrate => db:load_config
(See full trace by running task with --trace)

宝石ファイル

source 'https://rubygems.org'

Ruby '2.3.1'

git_source(:github) do |repo_name|
  repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
  "https://github.com/#{repo_name}.git"
end


# Bundle Edge Rails instead: gem 'Rails', github: 'Rails/rails'
gem 'Rails', '~> 5.1.4'

# Use sqlite3 as the database for Active Record
# gem 'sqlite3'

# Use postgres as the database for Active Record
gem 'pg'

# Use Puma as the app server
gem 'puma', '~> 3.7'
# Use SCSS for stylesheets
gem 'sass-Rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/Rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :Ruby

# Use CoffeeScript for .coffee assets and views
gem 'coffee-Rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/Rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

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

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  # Adds support for Capybara system testing and Selenium driver
  gem 'capybara', '~> 2.13'
  gem 'Selenium-webdriver'
end

# gma - start
group :development, :test do
  gem 'rspec-Rails', '~> 3.5', '>= 3.5.2'
  gem 'rspec-activemodel-mocks', '~> 1.0', '>= 1.0.3'
  gem 'shoulda-matchers', '~> 3.1', '>= 3.1.1'
  gem 'factory_bot_Rails', '~> 4.8', '>= 4.8.2'
  gem 'ffaker', '~> 2.2'
  # gem 'timecop', '~> 0.8.1'
end
# gma - end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/Rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Schema.rb

ActiveRecord::Schema.define(version: 20180110153949) do
  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

  create_table "articles", force: :cascade do |t|
    t.string "title"
    t.text "text"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end
end

移行ファイル

class CreateComments < ActiveRecord::Migration[5.1]
  def change
    create_table :comments do |t|
      t.string :commenter
      t.text :body
      t.references :article, foreign_key: true

      t.timestamps
    end
  end
end
ruby-on-railsrubypostgresqlbundlerrails-migrations
44
gangelo

現時点では、PG 1.0はRails 5.1.4と互換性がないようです。

gem 'pg', '~> 0.18'

私にとっては0.18でした。

61
Stef Hej

Postgres gemバージョン1.0.0はnot Rails 5.1.4と互換性があります。 postgres gemバージョンを '〜> 0.18'に変更すると、すべてが正常に機能しました。

変更後：

gem 'pg' # Defaults to latest version 1.0.0 (not compatible with Rails 5.1.4).

変更後：

gem 'pg', '~> 0.18'
14
gangelo