Question

我设置提醒服务，通过电子邮件发送与人群兴趣和城市相关的交易。基本上，用户输入重要日期（朋友bday，周年纪念日等）以及该特殊人士的兴趣。

我想根据1）用户城市和2）相关人员的利益向他们发送交易

我应该如何设置交易模型的关联？

到目前为止我有什么......

class User < ActiveRecord::Base
belongs_to :city
has_many :person_interests, :as => :person
has_many :interests, :through => :person_interests

end

class City < ActiveRecord::Base
 attr_accessible :name 
  belongs_to :province
  has_many :users
end

class PersonInterest < ActiveRecord::Base 
  belongs_to :interest
  belongs_to :person, :polymorphic => true  
end

class Interest < ActiveRecord::Base
  has_many :person_interests
end

谢谢！

Answer 1

如果交易可能适用于多个利息，您可以从以下内容开始：

class Deal < ActiveRecord::Base 
  belongs_to :interests
  belongs_to :city
end

class City < ActiveRecord::Base
 attr_accessible :name 
  belongs_to :province
  has_many :users
  has_many :deals
end

class Interest < ActiveRecord::Base
  has_many :person_interests
  has_many :deals
end

然后你可以做类似

的事情

@relevant_deals = @city.deals.where(:interest_id => 'abc')

或

@relevant_deals = @interest.deals.where(:city_id => 'def')

正确的Rails关联设置

1 个答案: