我有一个多态的位置模型:
class Location < ActiveRecord::Base
acts_as_mappable
before_validation :geocode_address, :on => :create
belongs_to :locatable, :polymorphic => true
end
引用它的用户模型:
class User < ActiveRecord::Base
acts_as_mappable :through => :location
has_one :location, :as => :locatable
end
在Rails控制台中将位置分配给用户的正确方法是什么?当我尝试以下操作时,出现错误:
l = Location.create(:full_address=>'123 maple street, chicago, il')
u = User.create(:username=>'foo') # => ArgumentError: You gave location in :through, but I could not find it on User.
我没有机会将位置分配给用户。
如果我删除'acts_as_mappable:through =&gt; :location'指令,我可以分配一个没有问题的位置:
l = Location.create(:full_address=>'123 maple street, chicago, il')
u = User.create(:username=>'foo')
u.location = l
答案 0 :(得分:1)
定义:位置需要先于其使用:
class User < ActiveRecord::Base
has_one :location, :as => :locatable
acts_as_mappable :through => :location
end