Ruby on rails 与基于关系表（Rails 2.3.5）的条件有多个贯穿关系

我的关系如下

companies_employee.rb
belongs_to :employee
belongs_to :company
validates_presence_of :role

employee.rb
has_many :companies_employees
has_many :companies, :through => :companies_employees

company.rb
has_many :companies_employees
has_many :managers, :through => :companies_employees, :source => :employee, conditions => {:role => "Manager"}
has_many :owners, :through => :companies_employees, :source => :employee, :conditions => {:role => "Owner"}

我的问题是，当它检查条件时，它试图在employees表中查找role列，但role列在companys\u employees表中。

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有没有办法让它使用此表中的内容作为条件？

尝试以下方法：

has_many :managers, :through => :companies_employees, :source => :employee, conditions => ["employees.role = 'Manager"]
has_many :owners, :through => :companies_employees, :source => :employee, conditions => ["employees.role = 'Owner"]

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这有着完全相同的问题，它仍然试图在employees表中查找row列，而我想要的是在：companys\u employees表中查找role列。那么，将employees.role更改为companys\u employees.role。