Question

如何设置belongs_to：through（我知道无效）关系？例如：一家公司有很多部门。一个部门有很多团队。有些团队是跨职能的，所以他们可以跨越多个部门（habtm）。

class Company < ActiveRecord::Base
  has_many :departments
  has_many :teams, through: :departments
end

class Department < ActiveRecord::Base
  belongs_to :company;
  has_and_belongs_to_many :teams
end

class Team < ActiveRecord::Base
  has_and_belongs_to_many :departments
end

如何从团队中获取公司资格。有什么好办法呢？第一个应该工作，但我可以或者我应该尝试在模型中作为一种关系吗？

class Team < ActiveRecord::Base
  has_and_belongs_to_many :departments

  def company 
    departments.first.company
  end

end

或

class Team < ActiveRecord::Base
  has_and_belongs_to_many: departments

  has_one :company, through: departments  (<-- is this valid?, seems like this should be has_many but that's not right!)
end

Answer 1

你想要的关系已经存在。如果您知道所有部门都属于同一家公司，那么

my_team.departments.first.company

rails habtm and belongs_to：through

1 个答案: