polymorphic-associations

问题 It's a lot of question about it all around, but I can't find the answer. I've: group.rb class Group < ActiveRecord::Base has_many :descriptions, :as => :describable accepts_nested_attributes_for :descriptions end description.rb class Description < ActiveRecord::Base belongs_to :describable, :polymorphic => true end groups_controller.rb def update @group = Group.find(params[:id]) if @group.update_attributes(group_params) flash[:success] = "yes" redirect_to groups_path else render 'edit' end

问题 I am trying to user a rails method called polymorphic_path but I am getting the wrong url. My polymorphic association is with Students and Landlords who are both Users through userable. Here are my models: class User < ActiveRecord::Base belongs_to :userable, polymorphic: true end class Student < ActiveRecord::Base has_one :user, :as => :userable end class Landlord < ActiveRecord::Base has_one :user, :as => :userable end I have a variable called current_user holding the User object. The

问题 Similar issue of the question below, but need a different solution ActionView::Template::Error (undefined method...) Works locally, but not on Heroku My polymorphic association Address>Account is working locally, but when I upload it to Heroku I get the following error when rendering the view: Rendered addresses/show.html.erb within layouts/application (101.1ms) 2016-01-09T03:04:14.947013+00:00 app[web.1]: 2016-01-09T03:04:14.947015+00:00 app[web.1]: ActionView::Template::Error (undefined

问题 Dear fellow Overflowers, I will try to give the essence of my issue. Thanks in advance for your patience. My Polymorphic Controller ( Appointments ) is accessed by two Views , the first belongs to Admin::Doctor namespace and the second one to Patient namespace. the relevant part of the routes.rb : map.resources :patient do |patients| patients.resources :appointments end map.namespace(:admin) do |admin| admin.resources :doctor do |doctors| doctors.resources :appointments end end So, I can now

问题 Isolated this question into it's own rails app: and added a git repo as an example Module: module SeoMeta def self.included(base) base.extend(ClassMethods) base.send :include, InstanceMethods end module ClassMethods def is_seo_meta has_one :meta, class_name: SeoMetum, as: :metumable, dependent: :destroy, autosave: true delegate :browser_title, :meta_description, :meta_author, :meta_keywords, :browser_title=, :meta_keywords=, :meta_description=, :meta_author=, to: :meta after_save :save_meta

问题 I have users, groups, and pages. Each record can have pictures. Here is my architecture: Polymorphic model for Pictures . Users, groups, and pages are picturable . Nested pictures controller for each of users, groups, and pages (e.g. users/5/pictures ) Is this the most standard set up? Am I forgetting any Rails convention? routes.rb example looks like this: resources :users do resources :pictures pictures_controller.rb looks like this: class PicturesController < ApplicationController before

问题 I want to create a polymorphic friendship/network system. For example User can request or be requester to join multiple models like: Company Project Group Contacts(friends) Some will be one to many e.g. a user is employed by one company but a company has many employees. Others many to many e.g a user has many projects a project has many users The relationships aren't to difficult to create using active recorded. The middle step, requesting(invitations) that has me baffled. After bit of

问题 How to retrieve rows from table dynamically without using "column definition list"? I am trying to do same by using polymorphic type "anyelement"(pseudo type) but getting error "structure of query does not match function result type". For example: I have table called "table1" which consist of following details. --Table create table table1 ( slno integer, fname varchar, lname varchar, city varchar, country varchar ) --Function create or replace function function1(column_name varchar,relation

问题 I have a rails app running ruby 2.1.2 and rails 4.1.1 and in it I have a polymorphic association like so: class Picture < ActiveRecord::Base belongs_to :imageable, polymorphic: true end class Employee < ActiveRecord::Base has_many :pictures, as: :imageable end class Product < ActiveRecord::Base has_many :pictures, as: :imageable end I want to be able to find all Pictures that either belong to a given Employee or have no associated "imageable" record. # These both work fine Picture.where

问题 I am very new to Rails and I want to create a Person model that has one Address and a Company Model that has one Address and one Person. Here is what I've done so far $ rails generate model Address street:string suburb:string $ rails g scaffold Person name:string address:references $ rails g scaffold Company name:string person:references address:references class Address < ActiveRecord::Base belongs_to :person belongs_to :company end class Person < ActiveRecord::Base has_one :address end class