ruby – 在Rails 4中的ActiveRecord中加载database.yml的位置？

ActiveRecord代码库中的哪一行(或方法)是否加载了Rails应用程序的config / database.yml？ (我具体看4.0.5,但是如果有人有关于> = 4.0.5的任何信息,那会很有启发性)？

解决方法

它位于Railties中,特别是在第101-116行的文件railties / lib / rails / application / configuration.rb中(对于Rails 4.0.5)：

https://github.com/rails/rails/blob/v4.0.5/railties/lib/rails/application/configuration.rb#L101-L116

# Loads and returns the configuration of the database.
def database_configuration
  yaml = paths["config/database"].first
  if File.exist?(yaml)
    require "erb"
    YAML.load ERB.new(IO.read(yaml)).result
  elsif ENV['DATABASE_URL']
    nil
  else
    raise "Could not load database configuration. No such file - #{yaml}"
  end
rescue Psych::SyntaxError => e
  raise "YAML Syntax error occurred while parsing #{paths["config/database"].first}. " \
        "Please note that YAML must be consistently indented using spaces. Tabs are not allowed. " \
        "Error: #{e.message}"
end