Rails link_to可能嵌套的多态属性

Question

I have a Region > Store > Device hierarchy, where each of these things can have a config_set.

class Region < ActiveRecord::Base
  has_many :stores, dependent: :destroy
  has_one :config_set, as: :configurable
end

class Store < ActiveRecord::Base
  has_many :devices
  has_one :config_set, as: :configurable
  belongs_to :region
end

class Device < ActiveRecord::Base
  has_one :config_set, as: :configurable
  belongs_to :store
end

class ConfigSet < ActiveRecord::Base
  belongs_to :configurable, polymorphic: true
end

From the config_set show page, I want to generate a link to whatever configurable that config_set belongs to. link_to is using polymorphic_url internally, which wants either a @device , a [@store, @device] , or a [@region, @store, @device] . Is there a simple way to deal with this?

Answer 1

发现了一个不是很好的解决方案，它滥用了polymorphic_url @device和[nil, @device]等效的事实，并结合了ruby的try ：

<%= link_to 'Back', [@config_set.configurable.try(:store).try(:region), @config_set.configurable.try(:store) || @config_set.configurable.try(:region), @config_set.configurable] %>