Rails:多态关联

时间:2015-10-17 23:01:39

标签: ruby-on-rails polymorphic-associations

我正在使用Rails 4构建应用程序。

我有地址模型和手机型号。它们中的每一个都被定义为具有许多其他模型的多态,因此它们可以在整个应用程序中使用 - 例如,用户具有电话号码,但公司也是如此。他们的数字可能不同。公司有一个地址,用户可以将其用作默认地址,也可以添加另一个地址作为自己的地址。

在我的代码中,我有一个地址模型:

class Address < ActiveRecord::Base

  geocoded_by :full_address_map   # can also be an IP address


  # --------------- associations

  belongs_to :addressable, :polymorphic => true

  # --------------- scopes

  # --------------- validations

  validates_presence_of :unit, :street, :zip, :country 


  # --------------- class methods

  def first_line
    [unit, street].join(' ')
  end

  def middle_line
    if self.building.present? 
    end
  end

  def last_line
    [city, region, zip].join('   ')
  end

  def country_name
    self.country = ISO3166::Country[country]
    country.translations[I18n.locale.to_s] || country.name
  end

  def address_without_country
    [self.first_line, middle_line, last_line].compact.join(" ")
  end

  def full_address_map
    [self.first_line, middle_line, last_line, country_name.upcase].compact.join("<br>").html_safe
  end

  def full_address_formal
    [self.first_line, middle_line, last_line, country_name].compact.join(" ").html_safe
  end


  # --------------- callbacks

  after_validation :geocode#, if  self.full_address.changed? 

  # --------------- instance methods

  # --------------- private methods

  protected

end

在我的地址_form partial中,我有表格供用户完成。

在我的组织模型中,我有:

class Organisation < ActiveRecord::Base

  # --------------- associations

    has_one :user # the user that is the representative 
    has_many :profiles # the users who have roles within the org


    has_many :addresses, :as_addressable
    has_many :phones, :as_phoneable


  # --------------- scopes



  # --------------- validations

  # --------------- class methods


  def address
    self.address.full_address_formal
  end


  # --------------- callbacks

  # --------------- instance methods

  # --------------- private methods


end

在我的组织控制器,新动作中,我有:

def new
    @organisation = Organisation.new
    @organisation.build_address
end

当我尝试这个时,我有这个错误:

NoMethodError at /organisations/new
undefined method `arity' for :as_addressable:Symbol

在我的地址表中,我有:

t.integer  "addressable_id"
t.string   "addressable_type"
add_index "addresses", ["addressable_type", "addressable_id"], name: "index_addresses_on_addressable_type_and_addressable_id", unique: true, using: :btree

我不明白错误的本质。这个结构缺少什么?

1 个答案:

答案 0 :(得分:1)

多态关联在声明中需要as选项。

has_many :addresses, as: :addressable
has_many :phones, as: :phoneable