无效的源反射宏：的has_many：通过 [英] Invalid source reflection macro :has_many :through

问题描述

我有这样的愤怒协会：融资> - 事件> - 子程序> - 程序。我想通过他们都获得查看在程序last_financings因此code是：

I have such angry associations: financings >- events >- subprograms >- programs. I want to get acces to last_financings from programs through all of them so code is:

class Fcp < Program
  has_many :fcp_subprograms,
           :foreign_key => 'parent_id'
  has_many :subprogram_last_actual_financings,
           :through => :fcp_subprograms,
           :source => :last_actual_financings

class FcpSubprogram < Program
  belongs_to :fcp,
             :class_name => 'Fcp',
             :foreign_key => 'parent_id'

  has_many :events,
           :foreign_key => 'fcp_id'

  has_many :last_actual_financings,
           :through => :events,
           :source => :last_actual_financings

class Event < ActiveRecord::Base
  belongs_to :fcp,
             :class_name => 'Fcp',
             :foreign_key => 'fcp_id'
  belongs_to :fcp_subprogram,
             :class_name => 'FcpSubprogram',
             :foreign_key => 'fcp_id'

  has_many :last_actual_financings,
           :class_name => 'ActualFinancing',
           :order => 'date DESC',
           :limit => 1

所以，当我想访问subprogram_last_actual_financings在after_initialize功能我得到这个错误

So when I want to access to subprogram_last_actual_financings in after_initialize function I get this error

Invalid source reflection macro :has_many :through for has_many :subprogram_last_actual_financings, :through => :fcp_subprograms.  Use :source to specify the source reflection.

但我有：在我的联想源的选择。我究竟做错了什么？

but I have :source option in my associations. What am I doing wrong?

推荐答案

你得到的错误是关于source_reflection是无效的关联，因为源的has_many通过必须是belongs_to的，HAS_ONE或无的has_many通过选项。所以你不能使用：last_actual_financings作为源

The error you get is about source_reflection is an invalid association, because source for has_many through must be belongs_to, has_one or has_many without through option. So you can't use :last_actual_financings as a source.

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