Question

要使用机场名称为我的数据库播种，我使用 application.yml 来定义机场集合：

AIRPORTS:
  - name: "Charles de Gaulle"
    city: "Paris"
    country: "France"
  - name: "Orly"
    city: "Paris"
    country: "France"

使用Rails命令（rails c）进行测试，我有：

2.0.0-p247 :001 > ENV['AIRPORTS']
 => "[{\"name\"=>\"Charles de Gaulle\", \"city\"=>\"Paris\", \"country\"=>\"France\"}, {\"name\"=>\"Orly\", \"city\"=>\"Paris\", \"country\"=>\"France\"}]"

这是一个字符串！然后，当键入以下内容时，我有一个错误：

2.0.0-p247 :002 > YAML.load(ENV['AIRPORTS'])
Psych::SyntaxError: (<unknown>): did not find expected ',' or '}' while parsing a flow mapping at line 1 column 2
from /Users/Hassen/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/psych.rb:205:in `parse'
from /Users/Hassen/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/psych.rb:205:in `parse_stream'
from /Users/Hassen/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/psych.rb:153:in `parse'
from /Users/Hassen/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/psych.rb:129:in `load'
from (irb):2
from /Users/Hassen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.13/lib/rails/commands/console.rb:47:in `start'
from /Users/Hassen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.13/lib/rails/commands/console.rb:8:in `start'
from /Users/Hassen/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.13/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'

我所期待的（我想要的）是拥有一个对象数组，因此我可以使用以下代码为我的数据库设定种子：

YAML.load(ENV['AIRPORTS']).each do |airport|
    AirPort.create airport
    puts 'airport created: ' << airport.name
end

谢谢，

Answer 1

使用figaro gem这可以解决问题：

(eval ENV["AIRPORTS"]).each do |params|
  Airport.create! params
  puts "Airport created: #{params["name"]}"

我通常使用简单的初始化程序load_config.rb，如：

YAML.load_file(Rails.root.join('config', 'application.yml'))['AIRPORTS'].each |params|
  Airport.create! params
  puts "Airport created #{params['name']}"
end

Rails + YAML：从application.yml加载YAML数据时的解析错误

1 个答案: