ActiveRecord：更新补丁中的外键

Tables:

表：

apps:
ID (PK)
name
status_id (FK to status table)

status:
ID(PK)
name


class App < ActiveRecord::Base
    belongs_to :status
end

class Status < ActiveRecord::Base
  has_many :apps
end
apps:
ID (PK)
name
status_id (FK