polymorphic-associations

问题 I have been trying to find this one link for hours now. I have a polymorphic association where both collections & assortments have designs. Collection model has_many :designs, :as => :targetable Assortment model has_many :designs, :as => :targetable Design model belongs_to :targetable, :polymorphic => true In order to link to the design's 'show' action, the proper polymorphic path would be: link_to polymorphic_path([@targetable, @design]) But I can't figure out how to link to the design's

问题 I had problems with forms using polymorphic association for an user sign-up. I want to show fields from multiple models of polymorphic association, but I can't. Model Classes: class User < ActiveRecord::Base devise ... belongs_to :userable, :polymorphic => true end class Advisor < ActiveRecord::Base has_one :user, :as => :userable attr_accessible :extra accepts_nested_attributes_for :user # Idon't know if it is ok end class AnotherKingOfUser < ActiveRecord::Base #the same.. end I want to make

问题 I'm creating a MySQL database and I ran into an instance in which I needed polymorphic associations... Obviously SQL does not support this, so I decided to create a column for each foreign key; found below: CREATE TABLE mixers ( mixers_id INT(11) NOT NULL PRIMARY KEY AUTO_INCREMENT, name VARCHAR(255) NOT NULL, 0_booze_id INT(11), 0_gen_booze_id INT(11), 0_gen_soda_id INT(11), 0_soda_id INT(11), 1_booze_id INT(11), 1_gen_booze_id INT(11), 1_gen_soda_id INT(11), 1_soda_id INT(11), 2_booze_id

问题 So I followed the Railscast 154 about implementing polymorphic associations and I was able to get it up and running, but whenever I try to call the user who commented I get an undefined method. Here's my Migration: class CreateComments < ActiveRecord::Migration def change create_table :comments do |t| t.text :content t.belongs_to :commentable, polymorphic: true t.references :member t.timestamps end add_index :comments, [:commentable_id, :commentable_type] add_index :comments, :member_id end

问题 Page has a polymorphic 1:1 relationship with a model called PageContent. PageContent has two subtypes (TextOnly and Video). I want to be able to able to do a findAll for "page" and get all of the content back. What am I doing wrong? JSBin 回答1: This seems to work: http://jsbin.com/names/1/edit Only wrong thing I could see is the App.Page.FIXTURES. It should be: App.Page.FIXTURES = [ { id: 1, title: "Introduction", pageContent: 1, pageContentType: "textOnly" },{ id: 2, title: "Summary",

问题 I am trying to set up the right indices on a table I have just created which contains 4 "polymorphic associations" and a PK ID . The 4 associations allow me not to have to quadruple the number of tables to the addition I am making to the database and should not be modified in this discussion. My question is how should I set up the indices so that I get optimal performance (speed, space not so much) ? None of the 4 keys is candidate for PK. More specifically all 4 are but only one at a time. I

问题 The attachment won't save. What I am missing here? In my application I have a project ,for each project user can upload many assets. The Upload is done by carrier wave. here are the models class Project < ActiveRecord::Base has_many :assets,:as => :assetable,dependent: :destroy accepts_nested_attributes_for :assets, :allow_destroy => true end class Asset < ActiveRecord::Base belongs_to :project belongs_to :user belongs_to :assetable, :polymorphic => true mount_uploader :attachment,

问题 I want the following on my form: Degree is polymorphic partial with has_many relation to profile. This partial is called by main form - profile. By pressing 'Add a Qualification' user can add as many degrees. I've been able to attach only one degree to profile which is the last one others are all ignored. I even know why it's happening because link_to is not able to pass profile instance. so I have to create new profile in degrees_controller as you can see in my code here. Can final profile

问题 I'm looking at mass assignment in Laravel, and trying to mass assign data for both one model and it's related model. My models: class News extends Eloquent { protected $table = 'news'; protected $fillable = array( 'title', 'slug', 'author', 'img', 'content', ); public function content() { return $this->morphMany('Content', 'morphable')->orderBy('section'); } } class Content extends Eloquent { protected $table = 'contents'; protected $fillable = array( 'rawText', 'section', ); public function

问题 I am migrating from the MetaSearch gem to the Ransack gem for an upgrade to Rails 3.1 and I am having problems with my searches for polymorphic associations. The existing MetaSearch syntax isn't working for Ransack, but I couldn't find any documentation mentioning any syntax changes. Or whether this feature is supported in Ransack. For example, from the MetaSearch github page, given the following classes: class Article < ActiveRecord::Base has_many :comments, :as => :commentable end class