Ruby on rails 3 jQuery TokenInput插件，具有深度嵌套的_属性，在编辑时预先填充令牌

我的应用程序采用以下结构

class Foo < ActiveRecord::Base
  has_many :examples, :dependent => :destroy

  accepts_nested_attributes_for :examples
end

class Example < ActiveRecord::Base
  belongs_to :foo
  has_many :codes, :dependent => :destroy

  accepts_nested_attributes_for :codes, :reject_if => lambda { |a| a[:code].blank? }
end
class Code < ActiveRecord::Base
  belongs_to :example
  has_many :code_kinds
  has_many :kinds, :through => :code_kinds
  attr_reader :kind_tokens

  def kind_tokens=(ids)
    self.kind_ids = ids.split(",")
  end
end
class CodeKind < ActiveRecord::Base

  belongs_to :code
  belongs_to :kind

end
class Kind < ActiveRecord::Base
    has_many :code_kinds
    has_many :codes, :through => :code_kinds   
end

但我不能做@foo.examples.code.kinds.map。。。因为与Foo和examples的关系返回一个集合，所以代码的情况也一样

我只是在用：

那是你的房间里面

现在，如果我没有任何循环，并且所有事情都是通过嵌套的属性和字段来完成的，那么我如何为代码预填充这种类型？

每次你使用

<%= f.text_field :author_tokens, "data-pre" => @book.authors.map(&:attributes).to_json %>

<%
@ctrEx = 0
@ctrCd = 0
%>
<%= form_for @foo ...
    <%= f.fields_for :examples do |examples_form| %>
        ...

        <%= examples_form.fields_for :codes do |codes_form| %>
            ...
            <%= codes_form.text_field :kind_tokens, :class => "tag_matcher", "data-pre" => @foo.examples[@ctrEx].codes[@ctrCd].kinds.map(&:attributes).to_json %>
            ...
            <%@ctrCd +=1%>
        <%end%>

        ...
        <%
        @ctrEx += 1
        @ctrCd = 0
        %>
    <%end%>
<%end%>

@foo.examples[@ctrEx].codes[@ctrCd].kinds.map(&:attributes).to_json