rails_4.2.11.1_新不加载'sqlite3'

Question

我是 rails 的新手，正在尝试使用 rvm

rvm use 2.4.1
rails _4.2.11.1_ new hello_app
cd hello_app
rails s

与 Rails 5 一起使用但在我的 Mac

上与 rails 4 和 ruby 2.4.1 一起失败

Gem::LoadError (Specified 'sqlite3' for database adapter, but the gem is not loaded. Add `gem 'sqlite3'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).):
  activerecord (4.2.11.1) lib/active_record/connection_adapters/connection_specification.rb:177:in `rescue in spec'

我的 Gemfile 是 rails 新生成的，没有注释

source 'https://rubygems.org'


gem 'rails', '4.2.11.1'
gem 'sqlite3'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
runtimes

gem 'jquery-rails'
more: https://github.com/rails/turbolinks
gem 'turbolinks'
https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc

group :development, :test do
  gem 'byebug'
end

group :development do
  gem 'web-console', '~> 2.0'

  gem 'spring'
end

Answer 1

只是因为rails找不到需要的gem的确切版本，请在下面明确提供版本，

gem 'sqlite3', '~> 1.3.6'

你可以找到参考资料here

如果它不起作用，请改变版本并尝试 gem 文件中的 gem 'sqlite3', '~> 1.3.0'。

rails_4.2.11.1_新不加载'sqlite3'

rails _4.2.11.1_ new does not load 'sqlite3'

ruby

ruby-on-rails

rails-activerecord