Rake任务，以database.example.yml复制到的database.yml

得到错误，同时通过rake任务Rake任务，以database.example.yml复制到的database.yml

copy_files.rake

namespace :copy do 
    desc "copy database.yml & application.yml" 
    task :config_files => :environment do 
    source = File.join(Rails.root, "config", "database.example.yml") 
    target = File.join(Rails.root, "config", "database.yml") 
    FileUtils.cp_r source, target 
    end 
end

错误复制database.example.yml到的database.yml

$ rake copy:config_files 
rake aborted! 
Cannot load `Rails.application.database_configuration`: 
Could not load database configuration. No such file - 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/application/configuration.rb:105:in `database_configuration' 
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.4/lib/active_record/railtie.rb:128:in `block (2 levels) in <class:Railtie>' 
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.4/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval' 
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.4/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook' 
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.4/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load' 
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.4/lib/active_support/lazy_load_hooks.rb:27:in `each' 
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.4/lib/active_support/lazy_load_hooks.rb:27:in `on_load' 
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.4/lib/active_record/railtie.rb:118:in `block in <class:Railtie>' 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/initializable.rb:30:in `instance_exec' 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/initializable.rb:30:in `run' 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/initializable.rb:55:in `block in run_initializers' 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/initializable.rb:54:in `run_initializers' 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/application.rb:300:in `initialize!' 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/railtie.rb:194:in `public_send' 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/railtie.rb:194:in `method_missing' 
/config/environment.rb:5:in `<top (required)>' 
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:247:in `require' 
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:247:in `block in require' 
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:232:in `load_dependency' 
/Library/Ruby/Gems/2.0.0/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:247:in `require' 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/application.rb:276:in `require_environment!' 
/Library/Ruby/Gems/2.0.0/gems/railties-4.1.4/lib/rails/application.rb:379:in `block in run_tasks_blocks' 
Tasks: TOP => copy:config_files => environment 
(See full trace by running task with --trace)

我看到错误是因为没有database.yml文件。是否有任何可能的方法通过rake任务复制database.yml文件？

来源

2014-10-16 Srikanth Jeeva

我认为答案是 - 没有。因为要运行rake任务，你需要有效的环境，没有'database.yml'是不可能的。也许你可以说出为什么要通过rake任务复制数据库的原因，也许最好通过ruby脚本来完成。 – gotva 2014-10-16 18:59:02

这里给出了一个例子，http://blog.envylabs.com/post/68063567445/rake-file-tasks，但不知道在哪里写任务。 – 2014-10-16 20:13:44

我感到惊讶！但@SrikanthJeeva是对的:)

我设法运行没有database.yml耙任务。你应该删除:environment，你不能使用Rails.root（因为你不能加载没有database.yml的Rails）。这适用于我

desc "copy database.yml & application.yml" 
    task :config_files do 
    source = File.join(Dir.pwd, "config", "database.example.yml") 
    target = File.join(Dir.pwd, "config", "database.yml") 
    FileUtils.cp_r source, target 
    end

来源

2014-10-17 07:18:33 gotva

而且对我也有效:)干杯！ – 2014-10-17 18:58:28

正如上面评论中提到的@gotva，您需要一个“有效”的环境来运行=> :environment的耙式任务。这样，rake任务加载Rails环境，它需要一个database.yaml文件。

可以实现与脚本或，例如，使用Ruby成IRB会话：

$ cd /app_rails_root_path 
$ irb 
> Dir.glob("config/*.yml.example").each { |f| FileUtils.cp(f, f.gsub(/\.example/,'')) }

来源

2014-10-16 19:29:12 markets

Rake任务，以database.example.yml复制到的database.yml

回答

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