3

现有协会

class Job < ActiveRecord::Base
  belongs_to :client
  belongs_to :contact
  belongs_to :location
  has_one :geofence, :through => :location
end

class Client < ActiveRecord::Base
  has_many :contacts
  has_many :locations
end

class Contact < ActiveRecord::Base
  belongs_to :client
end

class Location < ActiveRecord::Base
  belongs_to :client
  belongs_to :geofence
end

class Geofence < ActiveRecord::Base
  has_many :locations
end

在尝试从各种表中查找工作搜索字段时，我做了这样的事情

@jobs = Job.find(:all, :joins => [:client,:contact,:location,:geofence], :conditions => ['geofences.address like ?',"%#{params[:term]}%"])

这会产生以下错误

ActiveRecord::StatementInvalid (Mysql::Error: Unknown column 'geofences_jobs_join.location_id'

从以下查询

SELECT `jobs`.* FROM `jobs`   INNER JOIN `clients` ON `clients`.id = `jobs`.client_id  INNER JOIN `contacts` ON `contacts`.id = `jobs`.contact_id  INNER JOIN `locations` ON `locations`.id = `jobs`.location_id  INNER JOIN `locations` geofences_jobs_join ON (`jobs`.`id` = `geofences_jobs_join`.`location_id`)  INNER JOIN `geofences` ON (`geofences`.`id` = `geofences_jobs_join`.`geofence_id`)  WHERE ...

有没有办法通过作业模型中的不同关联或查询的连接部分来解决此问题？

我可以使用 find_by_sql 得到我需要的东西，但如果可能的话，我想避免这种情况。

4

1 回答 1

1

I think that in order to use a has_one :through association, your Job model should declare a has_one :location association, not the other way around, see this example.

That said, you can either try to redefine this association and move the location_id foreign key from the jobs table to job_id in locations, or try this query:

@jobs = Job.find(:all, :joins => [:client, :contact, { :location => :geofence }], :conditions => ['geofences.address like ?',"%#{params[:term]}%"])

In the latter case you'll have to remove the has_one :through.

于 2012-08-27T15:41:43.337 回答