polymorphic-associations

Rails polymorphic user model with Devise

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问题 So I know this question has been ask a ton of times but my question goes a little bit further. When modeling my application I have two types of users that have a polymorphic association to the user model. Such as: class User < ActiveRecord::Base belongs_to :profileable, :polymorphic => true end class User_Type_1 < ActiveRecord::Base has_one :user, :as => :profileable end class User_Type_2 < ActiveRecord::Base has_one :user, :as => :profileable end The reason I did this, instead of an STI, is

Batman.js: Related model undefined for polymorphic association not found

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问题 I'm running into an issue trying to implement polymorphic associations on a Batman model. I'm getting this error in the console: Related model undefined for polymorphic association not found. I'm having a hard time tracking down where I am going wrong. Where should I look to find the missing piece? My models look something like this: class Admin.Product.PopularCollectables extends Batman.Model @belongsTo 'collectable', polymorphic: true class Admin.Item extends Batman.Model @hasOne 'popular

How do I use Fluent NHibernate ReferencesAny mapping?

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问题 I've read a lot about Fluent NHibernate's ReferencesAny but I haven't seen a complete example. I think I understand most of it, but there is one part I don't get. In the class mapping ReferencesAny(x => x.MemberName) is used to define the relationship to the one or more referenced classes. What is MemberName ? How is it defined and how is it used to create the data in the database. I have three tables, the records in one table can reference records in one of the other two tables. The first

Polymorphic Associations in Rails

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问题 How do polymorphic associations work in Rails? What are their advantages? Is there a way to add belongs_to method just by running a migration? 回答1: Ryan has a railscast about this that is pretty good. Belongs_to isn't something you add to a migration, you add it to the model. In the migration, you have to add the foreign key column. For example if you have a post model that belongs to a user, you'd add the user_id column to the post activerecord in a migration. Then you add belongs_to :user

How do I set an Ember Data polymorphic model in QUnit?

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问题 Background I'm using Ember Data's ActiveModelAdapter on my project and defining a few models like so: App.GiftCard = DS.Model.extend( destination: DS.belongsTo('destination', polymorphic: true) isCampaign: (-> @get('destination.constructor') == App.Campaign ).property() ) App.Destination = DS.Model.extend() App.Campaign = DS.Model.extend() My gift card model has a polymorphic relationship as the destination, and one of the types will be a Campaign. This is all working as expected in the

unknown attribute on polymorphic nested form object creation

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I am trying to create an associated polymorphic object through fields_for. I am getting an unknown attribute error though when the parent is created, are the @order params not getting through somehow? Parent/Order controller - # GET /orders/new def new @order = Order.new @order.build_patient @order.product = OrthosisSpecification.new end # GET /hotels/1/edit def edit @order.build_patient end # POST /orders # POST /orders.json def create @order = Order.new(order_params) respond_to do |format| if @order.save format.html { redirect_to @order, notice: 'Order was successfully created.' } format

Connecting database view with polymorphic model in rails

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问题 I have the following setup which allows a user to have multiple projects and each project can have multiple tasks. A user can favourite multiple projects. class User < ActiveRecord::Base has_many :projects has_many :tasks, :through => :projects has_many :favourites has_many :favourite_projects, :through => :favourites, :source => :favourable, :source_type => "Project" has_many :favourite_tasks, :through => :favourite_projects, :source => :tasks ... end class Project < ActiveRecord::Base

Column family ID mismatch (found cebcc380-72d4-11e7-9a6b-bd620b945799; expected c05d6970-72d4-11e7-9a6b-bd620b945799)

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问题 How can i resolve this error Column family ID mismatch (found cebcc380-72d4-11e7-9a6b-bd620b945799; expected c05d6970-72d4-11e7-9a6b-bd620b945799) Caused by: java.util.concurrent.ExecutionException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found cebcc380-72d4-11e7-9a6b-bd620b945799; expected c05d6970-72d4-11e7-9a6b-bd620b945799) at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[na:1.8.0_131] at java.util.concurrent.FutureTask.get

real polymorphism in embed relations in mongoid

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问题 Using Mongoid3, I'm trying to add polymorphism to my embedded relations. I have a class Item that must embed_one object containing my informations. The deal is that : - my object's type can be one of those : Calendar , Sticker , Picture ; - regardless my object's type, I want to access it by a unique 'key' : detail e.g. : pry> my_item1.detail => `<Picture _id: 1234>` pry> my_item2.detail => `<Sticker _id: 8964>` pry> First, I tried using the keywords as and polymorphic like described here:

Source Reflection Errors with has_many :through

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问题 I'm attempting to create a system where my site's users can favorites pages. Those pages have two types, either clubs or sports. So, I have four models, associated as such: User Model: class User < ActiveRecord::Base .. has_many :favorites has_many :sports, :through => :favorites has_many :clubs, :through => :favorites .. end Favorites Model: class Favorite < ActiveRecord::Base .. belongs_to :user belongs_to :favoritable, :polymorphic => true end Club Model: class Club < ActiveRecord::Base ..