Ruby on rails 设计+；多态不与：id关联

我正在开发我的第一个应用程序，Desive给了我一点问题。我设计了一个模型用户，该用户与其他3个模型艺术家、标签、粉丝有多态关联。一切都是正确的，但当我创建一个新的艺术家，例如，所有作品都很好。当我重新登录该艺术家时，如果用户id为2，艺术家id为4，我将在艺术家控制器中的Show Action上获得“找不到id为2的艺术家”。我已经编辑了after_sign_in_path_for方法来检测帐户类型，以便在登录后重定向到用户类型的正确路径。从日志中看，艺术家的show action正在尝试匹配用户id，而不是匹配登录用户的艺术家id

我的模型：

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, 
         :recoverable, :rememberable, :trackable, :validatable
  belongs_to :account, polymorphic: true
  validates_uniqueness_of :user_name 
end


class Artist < ActiveRecord::Base
  has_one :user, as: :account, dependent: :destroy
  has_many :tracks, dependent: :destroy
  accepts_nested_attributes_for :user
  validates_uniqueness_of :artist_name 
  has_attached_file :avatar, 
                    :styles => { :medium => "300x300>", :thumb => "64x64>" }, 
                    :default_url => "https://s3-us-west-    2.amazonaws.com/trackfilter/default/default_250.png"
  validates_attachment_content_type :avatar, :content_type => /\Aimage\/.*\Z/
end

class Fan < ActiveRecord::Base
  has_one :user, as: :account, dependent: :destroy
  accepts_nested_attributes_for :user
  has_attached_file :avatar, 
                    :styles => { :medium => "300x300>", :thumb => "150x150>" }, 
                    :default_url => "https://s3-us-west-2.amazonaws.com/trackfilter/default/default_250.png"
  validates_attachment_content_type :avatar, :content_type => /\Aimage\/.*\Z/
end

class Label < ActiveRecord::Base
  has_one :user, as: :account, dependent: :destroy
  accepts_nested_attributes_for :user
  validates_uniqueness_of :label_name 
  has_attached_file :avatar, 
                    :styles => { :medium => "300x300>", :thumb => "150x150>" }, 
                    :default_url => "https://s3-us-west-2.amazonaws.com/trackfilter/default/default_250.png"
  validates_attachment_content_type :avatar, :content_type => /\Aimage\/.*\Z/
end

对我来说，很明显，这是通过了Desive用户ID，而不是艺术家ID。。有什么想法可以补救吗

---

谢谢…

您的问题在重定向中，您需要提供帐户，因为它是艺术家/粉丝控制器查找对象所需的帐户id

class ApplicationController < ActionController::Base

 def after_sign_in_path_for(resource)
   if resource.account_type == "Artist" 
     artist_path(resource.account)
   elsif resource.account_type ==  "Label"
     label_path(resource.account)
   else resource.account_type == "Fan"
     fan_path(resource.account)
   end
 end
end

class ApplicationController

或者更好（相同的逻辑，不同的文字）：

class ApplicationController

或者更时髦/灵活/危险：

class ApplicationController < ActionController::Base

 def after_sign_in_path_for(resource)
   self.public_send("#{resource.account_type.to_s.downcase.underscore}_path".to_sym, resource.account)
 end
end

class ApplicationController

啊，是的，这很有道理。。我知道这就是问题所在，但我不知道如何进行转移。。我仍然无法将所需的信息放在正确的位置。。谢谢，这就像你说的那样。。没有尝试过危险的选择（tho；）

Started POST "/users/sign_in" for 127.0.0.1 at 2014-07-10 16:19:23 -0600
Processing by Devise::SessionsController#create as HTML
  Parameters: {"utf8"=>"✓",     "authenticity_token"=>"bdHPGqkUlW2OkJiP0qHaJOI1fnEMR3o+wZEwrWoQVxs=", "user"=>    {"email"=>"dino@dino.com", "password"=>"[FILTERED]", "remember_me"=>"0"}, "commit"=>"Sign in"}
  User Load (0.2ms)  SELECT  "users".* FROM "users"  WHERE "users"."email" = 'dino@dino.com'  ORDER BY "users"."id" ASC LIMIT 1 (0.1ms)  begin transaction SQL (0.3ms)  UPDATE "users" SET "current_sign_in_at" = ?, "last_sign_in_at" = ?, "sign_in_count" = ?, "updated_at" = ? WHERE "users"."id" = 2  [["current_sign_in_at", "2014-07-10 22:19:23.660435"], ["last_sign_in_at", "2014-07-10 22:15:59.573569"], ["sign_in_count", 26], ["updated_at", "2014-07-10 22:19:23.661056"]](4.0ms)  commit transaction
Redirected to http://localhost:3000/artists/2
Completed 302 Found in 78ms (ActiveRecord: 4.6ms)

Started GET "/artists/2" for 127.0.0.1 at 2014-07-10 16:19:23 -0600
Processing by ArtistsController#show as HTML
  Parameters: {"id"=>"2"}
  Artist Load (0.1ms)  SELECT  "artists".* FROM "artists"  WHERE "artists"."id" = ? LIMIT 1  [["id", 2]]
Completed 404 Not Found in 1ms

ActiveRecord::RecordNotFound - Couldn't find Artist with 'id'=2:

class ApplicationController < ActionController::Base

 def after_sign_in_path_for(resource)
   if resource.account_type == "Artist" 
     artist_path(resource.account)
   elsif resource.account_type ==  "Label"
     label_path(resource.account)
   else resource.account_type == "Fan"
     fan_path(resource.account)
   end
 end
end

class ApplicationController < ActionController::Base

 def after_sign_in_path_for(resource)
   account = resource.account
   case account
     when 'Artist' then artist_path(account)
     when 'Label' then label_path(account)
     when 'Fan' then fan_path(account)
     else
       #Handle error
   end
 end
end

class ApplicationController < ActionController::Base

 def after_sign_in_path_for(resource)
   self.public_send("#{resource.account_type.to_s.downcase.underscore}_path".to_sym, resource.account)
 end
end