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我确实有以下代码结构：

class Asset < ActiveRecord::Base
  belongs_to :state
  scope :order_by_year, -> { joins(:state).merge(State.order_by_year) }
  ...

class State < ActiveRecord::Base
  belongs_to :financial_statement
  has_many :assets
  scope :order_by_year, -> { joins(:financial_statement).merge(FinancialStatement.order_by_year) }
  ...  

class FinancialStatement < ActiveRecord::Base
  belongs_to :financial_year
  has_many :states
  scope :order_by_year, -> { joins(:financial_year).merge(FinancialYear.order_by_year) }
  ...

class FinancialYear < ActiveRecord::Base
  has_many :financial_statements
  scope :order_by_year, -> { order("financial_years.year DESC") }
  ...

我希望能够像这样调用资产模型：

Asset.order_by_year

我正在尝试遵循德米特法则，因此资产模型不应该了解 FinancialYear （其中包含年份信息）。我正在尝试使用合并来完成此操作。

Asset.order_by_year creates the following sql:

1: SELECT `assets`.* FROM `assets` 
2: INNER JOIN `states` ON `states`.`id` = `assets`.`state_id` 
3: LEFT OUTER JOIN `financial_years` ON `financial_years`.`id` = `financial_statements`.`financial_year_id` 
4: LEFT OUTER JOIN `financial_statements` ON `financial_statements`.`id` = `states`.`financial_statement_id`  
5: ORDER BY financial_years.year DESC

这会给出错误消息，因为第 3 行和第 4 行的顺序错误。知道 Rails 以这种方式创建查询的原因吗？知道如何更改此结构以使其正常工作吗？任何帮助将不胜感激。

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