小编nic*_*ant的帖子

我正在尝试为与Step具有has_many关系的Recipe模型自定义ActiveAdmin表单.

class Recipe < ActiveRecord::Base
  has_many :steps
end

class Step < ActiveRecord::Base
  acts_as_list :scope => :recipe

  belongs_to :recipe
end

我在与此相关的ActiveAdmin文件中有以下内容:

form do |f|
  f.has_many :steps do |ing_f|
    ing_f.inputs
  end
end

我尝试加载表单时抛出以下错误:

未定义的方法`new_record？' 为零:NilClass

到目前为止,我已经将它与has_many方法隔离开了但是我已经迷失了.任何建议和帮助将不胜感激!

在尝试存储文件时,我得到以下内容:

TypeError: can't convert nil into String
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/fog-0.7.2/lib/fog/core/hmac.rb:23:in `digest'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/fog-0.7.2/lib/fog/core/hmac.rb:23:in `block in setup_sha1'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/fog-0.7.2/lib/fog/core/hmac.rb:15:in `call'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/fog-0.7.2/lib/fog/core/hmac.rb:15:in `sign'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/fog-0.7.2/lib/fog/storage/aws.rb:309:in `signature'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/fog-0.7.2/lib/fog/storage/aws.rb:317:in `request'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/fog-0.7.2/lib/fog/storage/requests/aws/put_object.rb:43:in `put_object'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/fog-0.7.2/lib/fog/storage/models/aws/file.rb:119:in `save'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/fog-0.7.2/lib/fog/core/collection.rb:50:in `create'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/bundler/gems/carrierwave-d2cb99103a4f/lib/carrierwave/storage/fog.rb:229:in `store'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/bundler/gems/carrierwave-d2cb99103a4f/lib/carrierwave/storage/fog.rb:79:in `store!'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/bundler/gems/carrierwave-d2cb99103a4f/lib/carrierwave/uploader/store.rb:59:in `block in store!'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/bundler/gems/carrierwave-d2cb99103a4f/lib/carrierwave/uploader/callbacks.rb:17:in `with_callbacks'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/bundler/gems/carrierwave-d2cb99103a4f/lib/carrierwave/uploader/store.rb:58:in `store!'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/bundler/gems/carrierwave-d2cb99103a4f/lib/carrierwave/mount.rb:324:in `store!'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/bundler/gems/carrierwave-d2cb99103a4f/lib/carrierwave/mount.rb:214:in `store_poster!'
... 3 levels...
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.7/lib/active_record/validations.rb:43:in `save'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.7/lib/active_record/attribute_methods/dirty.rb:21:in `save'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.7/lib/active_record/transactions.rb:240:in `block (2 levels) in save'
    from /Users/nick/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.7/lib/active_record/transactions.rb:292:in `block in with_transaction_returning_status' …