小编Yan*_*nto的帖子

我正在从0.5迁移到1.0.

在阅读时,我注意到两种不同的方式来声明属性,使用hostAttributes和properties.

这两个有什么区别？

我在config/application.rb中遵循了注释指南

   # Settings in config/environments/* take precedence over those specified here.
   # Application configuration should go into files in config/initializers
   # -- all .rb files in that directory are automatically loaded.

但是当我加入Rails.application.config.eager_load_paths << Rails.root.join('lib')时config/initializers/eager_load.rb.

它抛出 <top (required)>': can't modify frozen Array (RuntimeError)

是的,如果我把它放在里面它是有效的config/application.rb.

我想知道为什么它不能用于初始化器以及如何使用约定使其工作？

示例代码:

hash_of_array = { a: [] }
b = hash_of_array
c = hash_of_array

b[:a] << 1

puts b # => { a: [1] }
puts c # => { a: [1] }

为什么两个变量的数组都有1？我只将它附加在变量上b.

试穿

• Ruby版本2.3.1,2.4.0
• Rbenv

例如,在 https://github.com/locomotivecms/wagon/blob/master/Rakefile#L23上

desc 'build the gem and release it to rubygems.org'
task release: :gem do
  sh "gem push pkg/locomotivecms_wagon-#{gemspec.version}.gem"
end

当我跑rake --task,它返回作为描述.

rake clobber_package   # Remove package products
rake gem               # Build the gem file locomotivecms_wagon-2.2.0.beta1.gem
rake package           # Build all the packages
rake release           # build the gem and release it to rubygems.org
rake repackage         # Force a rebuild of the package files
rake spec              # Run RSpec code examples
rake spec:integration  # Run RSpec code examples …