在轨道上的ruby中使用相同的2个表的多个一对多关系？

Question

我有一个包含2个表的数据库;用户和修订。修订版与users表有多个一对多关系，例如created_by，verified_by，published_by（每个字段都是外键用户ID）。

我如何在Rails模型中定义这种关系？

Answer 1

class Revision < ActiveRecord::Base
  belongs_to :creator, :foreign_key => "created_by", :class_name => "User"
  belongs_to :verifier, :foreign_key => "verified_by", :class_name => "User"
  belongs_to :publisher, :foreign_key => "published_by", :class_name => "User"
end

class User < ActiveRecord::Base
  has_many :creations, :foreign_key => "created_by", :class_name => "Revision"
  has_many :verifications, :foreign_key => "verified_by",
    :class_name => "Revision"
  has_many :publications, :foreign_key => "published_by",
    :class_name => "Revision"
end

使用这些模型：

User.first.creations    #=> [#<Revision>, #<Revision>, ...]
Revision.first.creator  #=>  #<User>
# ...etc., for verifier/verifications and publisher/publications.

您可能应该将关联名称更改为应用中最有意义的内容。