Spree - Generator命令

Question

我刚接触Spree和Rails，并且一直在遵循spree上的开发人员指南(http://guides.spreecommerce.com/developer/extensions_tutorial.html)来构建一个新的扩展，但没有成功。

当我在我的中执行以下操作时，

rails g migration add_sale_price_to_spree_variants sale_price:decimal

我得到了

    C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/acts_as_list-0.2.0/lib/acts
_as_list.rb:18:in `insert': uninitialized constant ActiveRecord::Base (NameError
)
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/acts_as_list-0
.2.0/lib/acts_as_list.rb:24:in `<top (required)>'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/core_
ext/kernel_require.rb:64:in `require'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/core_
ext/kernel_require.rb:64:in `require'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/spree_core-2.0
.4/lib/spree/core.rb:3:in `<top (required)>'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/core_
ext/kernel_require.rb:116:in `require'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/core_
ext/kernel_require.rb:116:in `rescue in require'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/core_
ext/kernel_require.rb:122:in `require'
        from C:/Sites/spree_layered_pricing/lib/spree_layered_pricing/engine.rb:
3:in `<class:Engine>'
        from C:/Sites/spree_layered_pricing/lib/spree_layered_pricing/engine.rb:
2:in `<module:SpreeLayeredPricing>'
        from C:/Sites/spree_layered_pricing/lib/spree_layered_pricing/engine.rb:
1:in `<top (required)>'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/core_
ext/kernel_require.rb:112:in `require'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/core_
ext/kernel_require.rb:112:in `require'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
4/lib/rails/engine/commands.rb:13:in `<top (required)>'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/core_
ext/kernel_require.rb:64:in `require'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/core_
ext/kernel_require.rb:64:in `require'
        from script/rails:7:in `<main>'

有什么办法可以解决这个问题吗？我错过了什么？

Answer 1

他们说，在你提到的文档中，只需忽略迁移示例即可

TODO:使上述生成器在扩展目录中实际工作

您是否尝试过使用不同的名称，然后使用他们提供的代码？

class AddSalePriceToSpreeVariants < ActiveRecord::Migration
  def change
    add_column :spree_variants, :sale_price, :decimal, :precision => 8, :scale => 2
  end
end