Question

我使用的是Rails 5.1。我很困惑如何创建一个模型和关联，其中我有一个链接两个模型的连接表。下面是两张表的PostGres连接表......

[AllowAnonymous]
[RoutePrefix("api/sandbox")]
public class SandboxApiController : ApiController
{
    [HttpPost, Route("test")]
    public IHttpActionResult Test()
    {
        throw new InvalidOperationException($"you screwed up. Local: {RequestContext.IsLocal}, IT: {User.IsInRole("IT")}");
    }
}

那么我就像这样定义模型

mydb=# \d organization_workers;
                               Table "public.organization_workers"
      Column       |  Type   |                          Modifiers
-------------------+---------+--------------------------------------------------------------
 id                | integer | not null default nextval('organization_workers_id_seq'::regclass)
 organization_id        | integer |
 stratum_worker_id | integer |

但是当我运行引用

的测试时

class Organization < ApplicationRecord

  has_many :stratum_workers, :through => :organization_workers



class OrganizationWorker < ApplicationRecord
  belongs_to :organization
  belongs_to :stratum_worker
end

我收到错误

assert_false organization.stratum_workers.empty?, "A pre-condition of this test is thta the org have stratum workers."

Answer 1

您需要先为连接表本身定义has_many，然后才能定义through关联。否则，Rails将不知道在哪里寻找弥合差距。

您的加入模式看起来不错。但是你加入的模型应该是这样的：

class Organization < ApplicationRecord

  has_many :organization_workers
  has_many :stratum_workers, through: :organization_workers

end


class StratumWorker < ApplicationRecord

  has_many :organization_workers
  has_many :organizations, through: organization_workers

end

包括＆＃34; has_many＆＃34;在我的模型中，但我得到了一个＆＃34; ActiveRecord :: HasManyThroughAssociationNotFoundError＆＃34;错误

1 个答案: