has-many

问题 I use Cakephp framework, and I have problem with my association. How create belong to association in models in cake php. When I use belongto and hasMany in my model. Can I find sample model to view this example? 回答1: Simple belongsTo association: <?php class Profile extends AppModel { var $name = 'Profile'; var $belongsTo = array( 'User' => array( 'className' => 'User', 'foreignKey' => 'user_id' ) ); } ?> Simple hasMany association: <?php class User extends AppModel { var $name = 'User'; var

问题 I have three models: class Coupon < ActiveRecord::Base belongs_to :event has_many :coupon_events, :dependent => :destroy has_many :events, :through => :coupon_events end class Event < ActiveRecord::Base belongs_to :event has_many :coupon_events, :dependent => :destroy has_many :coupons, :through => :coupon_events end class CouponEvent < ActiveRecord::Base belongs_to :coupon belongs_to :event end I read through a CSV file to create coupons and coupon_events. This is terribly inefficient since

问题 This question already has an answer here : Selecting all Records if Record has any of the ID's from Array (1 answer) Closed 3 years ago . I am having trouble finding the right syntax and operator to check if a record has the same ID of any of the ID's stored in an Array. Is there a has any? function or similar? @problem = Remedy.where(["LOWER(\"remedyName\") LIKE?", "%#{params[:searchremedy]}%".downcase]).pluck(:id) @pretreatments = Treatment.joins(:remedies_treatment).where(:remedies

问题 class A < ActiveRecord::Base has_many :Bs has_many :Cs ... end I wish to load all of B's and C's whenever I do a query on A, say A.where(name: :abc) , with a single query, instead of multiple calls to database. I don't wish to specify .includes for every query I run. How do I specify eager loading in the model itself? I looked many similar question and tried do this but it does not work: default_scope :include => [:Bs, :Cs] 回答1: default_scope { includes(:Bs, :Cs) } should do it. As far as I

问题 I'm using Ember: 1.3.0-beta.2 and Ember Data: 1.0.0-beta.2 Here's my setup: Models Rise.User = DS.Model.extend({ //.... user_training_plans: DS.hasMany('training_plan', { async: true }), user_training_histories: DS.hasMany('training_history', { async: true }), }); Rise.TrainingHistory = DS.Model.extend({ //.... user: DS.belongsTo('user', { async: true }), training_resource: DS.belongsTo('training_resource', { async: true }) }); Rise.TrainingPlan = DS.Model.extend({ //.... user: DS.belongsTo(

问题 I am trying to achieve this Department -HasMany->Contacts. Have no clue Department gets saved but Contacts doesnt get Saved you can refer this section in jsbin App.NewcontactController = Ember.ObjectController.extend({ needs: ['department'], save: function () { var department = this.get('controllers.department').get('model'); var newContact = App.Contact.create({ name: this.get('name'), department: department }); department.get('contacts').addObject(newContact); console.log(department);

问题 I have two models, folder and files. A folder has many files. If I say folder.get('files') I get all the files associated with that folder ordered by id. I would like the array of files to be order by something other then the id; lets say createDate. If possible, I do not want to make a computed property that has a different name then files . Any help would greatly be appreciated? 回答1: As mentioned in my comment you need to create an computed property files in your controller, which contains

问题 I have the following form declaration for a new kindergarten <%= form_for @kindergarten, :html => {:multipart => true} do |f|%> <%= render 'shared/error_messages', object: f.object %> </br> <%= f.fields_for :photos do |p| %> <%= p.label 'upload photo'%> <%= p.file_field :image %> <% end %> </br> <%= render 'about_company', f: f%> </br> <%= render 'contact', f: f %> <%= f.submit "Create my account", class: "btn btn-large btn-primary" %> <%end%> The logic behind this is that 1 kindergarten can

问题 I'm new to Ruby on Rails and I'm trying to understand abstract class. Maybe I still have in mind Java structure... I followed many tutorials and there is still things I'd need to understand. Let's say we want to build a contact book. In this address book, we have people and companies. class Address < ActiveRecord::Base belongs_to :addressable, :polymorphic => true end class Person < ActiveRecord::Base has_one :address, :as => :addressable end class Company < ActiveRecord::Base has_one

问题 One thing with which I have long had problems, within the CakePHP framework, is defining simultaneous hasOne and hasMany relationships between two models. For example: BlogEntry hasMany Comment BlogEntry hasOne MostRecentComment (where MostRecentComment is the Comment with the most recent created field) Defining these relationships in the BlogEntry model properties is problematic. CakePHP's ORM implements a has-one relationship as an INNER JOIN , so as soon as there is more than one Comment,